![Ming Lei](/assets/img/avatar_default.png)
Callers of request_firmware* must hold the reference count of @device, otherwise it is easy to trigger oops since the firmware loader device is the child of @device. This patch adds comments about the usage. In fact, most of drivers call request_firmware* in its probe() or open(), so the constraint should be reasonable and can be satisfied. Also this patch holds the reference count of @device before schedule_work() in request_firmware_nowait() to avoid that the @device is released after request_firmware_nowait returns and before the worker function is scheduled. Signed-off-by: Ming Lei <ming.lei@canonical.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
962 lines
23 KiB
C
962 lines
23 KiB
C
/*
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* firmware_class.c - Multi purpose firmware loading support
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*
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* Copyright (c) 2003 Manuel Estrada Sainz
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*
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* Please see Documentation/firmware_class/ for more information.
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*
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*/
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#include <linux/capability.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/timer.h>
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#include <linux/vmalloc.h>
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#include <linux/interrupt.h>
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#include <linux/bitops.h>
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#include <linux/mutex.h>
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#include <linux/workqueue.h>
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#include <linux/highmem.h>
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#include <linux/firmware.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/list.h>
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MODULE_AUTHOR("Manuel Estrada Sainz");
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MODULE_DESCRIPTION("Multi purpose firmware loading support");
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MODULE_LICENSE("GPL");
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/* Builtin firmware support */
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#ifdef CONFIG_FW_LOADER
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extern struct builtin_fw __start_builtin_fw[];
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extern struct builtin_fw __end_builtin_fw[];
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static bool fw_get_builtin_firmware(struct firmware *fw, const char *name)
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{
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struct builtin_fw *b_fw;
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for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++) {
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if (strcmp(name, b_fw->name) == 0) {
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fw->size = b_fw->size;
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fw->data = b_fw->data;
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return true;
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}
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}
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return false;
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}
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static bool fw_is_builtin_firmware(const struct firmware *fw)
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{
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struct builtin_fw *b_fw;
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for (b_fw = __start_builtin_fw; b_fw != __end_builtin_fw; b_fw++)
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if (fw->data == b_fw->data)
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return true;
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return false;
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}
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#else /* Module case - no builtin firmware support */
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static inline bool fw_get_builtin_firmware(struct firmware *fw, const char *name)
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{
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return false;
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}
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static inline bool fw_is_builtin_firmware(const struct firmware *fw)
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{
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return false;
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}
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#endif
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enum {
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FW_STATUS_LOADING,
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FW_STATUS_DONE,
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FW_STATUS_ABORT,
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};
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static int loading_timeout = 60; /* In seconds */
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static inline long firmware_loading_timeout(void)
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{
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return loading_timeout > 0 ? loading_timeout * HZ : MAX_SCHEDULE_TIMEOUT;
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}
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struct firmware_cache {
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/* firmware_buf instance will be added into the below list */
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spinlock_t lock;
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struct list_head head;
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};
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struct firmware_buf {
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struct kref ref;
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struct list_head list;
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struct completion completion;
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struct firmware_cache *fwc;
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unsigned long status;
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void *data;
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size_t size;
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struct page **pages;
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int nr_pages;
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int page_array_size;
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char fw_id[];
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};
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struct firmware_priv {
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struct timer_list timeout;
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bool nowait;
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struct device dev;
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struct firmware_buf *buf;
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struct firmware *fw;
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};
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#define to_fwbuf(d) container_of(d, struct firmware_buf, ref)
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/* fw_lock could be moved to 'struct firmware_priv' but since it is just
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* guarding for corner cases a global lock should be OK */
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static DEFINE_MUTEX(fw_lock);
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static struct firmware_cache fw_cache;
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static struct firmware_buf *__allocate_fw_buf(const char *fw_name,
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struct firmware_cache *fwc)
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{
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struct firmware_buf *buf;
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buf = kzalloc(sizeof(*buf) + strlen(fw_name) + 1 , GFP_ATOMIC);
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if (!buf)
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return buf;
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kref_init(&buf->ref);
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strcpy(buf->fw_id, fw_name);
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buf->fwc = fwc;
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init_completion(&buf->completion);
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pr_debug("%s: fw-%s buf=%p\n", __func__, fw_name, buf);
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return buf;
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}
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static struct firmware_buf *__fw_lookup_buf(const char *fw_name)
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{
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struct firmware_buf *tmp;
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struct firmware_cache *fwc = &fw_cache;
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list_for_each_entry(tmp, &fwc->head, list)
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if (!strcmp(tmp->fw_id, fw_name))
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return tmp;
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return NULL;
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}
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static int fw_lookup_and_allocate_buf(const char *fw_name,
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struct firmware_cache *fwc,
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struct firmware_buf **buf)
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{
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struct firmware_buf *tmp;
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spin_lock(&fwc->lock);
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tmp = __fw_lookup_buf(fw_name);
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if (tmp) {
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kref_get(&tmp->ref);
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spin_unlock(&fwc->lock);
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*buf = tmp;
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return 1;
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}
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tmp = __allocate_fw_buf(fw_name, fwc);
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if (tmp)
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list_add(&tmp->list, &fwc->head);
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spin_unlock(&fwc->lock);
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*buf = tmp;
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return tmp ? 0 : -ENOMEM;
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}
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static struct firmware_buf *fw_lookup_buf(const char *fw_name)
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{
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struct firmware_buf *tmp;
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struct firmware_cache *fwc = &fw_cache;
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spin_lock(&fwc->lock);
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tmp = __fw_lookup_buf(fw_name);
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spin_unlock(&fwc->lock);
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return tmp;
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}
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static void __fw_free_buf(struct kref *ref)
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{
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struct firmware_buf *buf = to_fwbuf(ref);
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struct firmware_cache *fwc = buf->fwc;
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int i;
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pr_debug("%s: fw-%s buf=%p data=%p size=%u\n",
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__func__, buf->fw_id, buf, buf->data,
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(unsigned int)buf->size);
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spin_lock(&fwc->lock);
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list_del(&buf->list);
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spin_unlock(&fwc->lock);
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vunmap(buf->data);
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for (i = 0; i < buf->nr_pages; i++)
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__free_page(buf->pages[i]);
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kfree(buf->pages);
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kfree(buf);
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}
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static void fw_free_buf(struct firmware_buf *buf)
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{
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kref_put(&buf->ref, __fw_free_buf);
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}
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static void __init fw_cache_init(void)
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{
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spin_lock_init(&fw_cache.lock);
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INIT_LIST_HEAD(&fw_cache.head);
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}
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static struct firmware_priv *to_firmware_priv(struct device *dev)
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{
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return container_of(dev, struct firmware_priv, dev);
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}
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static void fw_load_abort(struct firmware_priv *fw_priv)
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{
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struct firmware_buf *buf = fw_priv->buf;
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set_bit(FW_STATUS_ABORT, &buf->status);
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complete_all(&buf->completion);
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}
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static ssize_t firmware_timeout_show(struct class *class,
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struct class_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%d\n", loading_timeout);
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}
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/**
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* firmware_timeout_store - set number of seconds to wait for firmware
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* @class: device class pointer
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* @attr: device attribute pointer
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* @buf: buffer to scan for timeout value
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* @count: number of bytes in @buf
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*
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* Sets the number of seconds to wait for the firmware. Once
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* this expires an error will be returned to the driver and no
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* firmware will be provided.
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*
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* Note: zero means 'wait forever'.
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**/
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static ssize_t firmware_timeout_store(struct class *class,
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struct class_attribute *attr,
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const char *buf, size_t count)
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{
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loading_timeout = simple_strtol(buf, NULL, 10);
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if (loading_timeout < 0)
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loading_timeout = 0;
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return count;
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}
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static struct class_attribute firmware_class_attrs[] = {
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__ATTR(timeout, S_IWUSR | S_IRUGO,
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firmware_timeout_show, firmware_timeout_store),
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__ATTR_NULL
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};
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static void fw_dev_release(struct device *dev)
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{
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struct firmware_priv *fw_priv = to_firmware_priv(dev);
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kfree(fw_priv);
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module_put(THIS_MODULE);
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}
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static int firmware_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct firmware_priv *fw_priv = to_firmware_priv(dev);
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if (add_uevent_var(env, "FIRMWARE=%s", fw_priv->buf->fw_id))
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return -ENOMEM;
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if (add_uevent_var(env, "TIMEOUT=%i", loading_timeout))
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return -ENOMEM;
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if (add_uevent_var(env, "ASYNC=%d", fw_priv->nowait))
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return -ENOMEM;
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return 0;
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}
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static struct class firmware_class = {
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.name = "firmware",
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.class_attrs = firmware_class_attrs,
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.dev_uevent = firmware_uevent,
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.dev_release = fw_dev_release,
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};
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static ssize_t firmware_loading_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct firmware_priv *fw_priv = to_firmware_priv(dev);
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int loading = test_bit(FW_STATUS_LOADING, &fw_priv->buf->status);
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return sprintf(buf, "%d\n", loading);
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}
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/* firmware holds the ownership of pages */
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static void firmware_free_data(const struct firmware *fw)
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{
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WARN_ON(!fw->priv);
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fw_free_buf(fw->priv);
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}
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/* Some architectures don't have PAGE_KERNEL_RO */
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#ifndef PAGE_KERNEL_RO
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#define PAGE_KERNEL_RO PAGE_KERNEL
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#endif
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/**
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* firmware_loading_store - set value in the 'loading' control file
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* @dev: device pointer
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* @attr: device attribute pointer
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* @buf: buffer to scan for loading control value
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* @count: number of bytes in @buf
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*
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* The relevant values are:
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*
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* 1: Start a load, discarding any previous partial load.
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* 0: Conclude the load and hand the data to the driver code.
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* -1: Conclude the load with an error and discard any written data.
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**/
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static ssize_t firmware_loading_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct firmware_priv *fw_priv = to_firmware_priv(dev);
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struct firmware_buf *fw_buf = fw_priv->buf;
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int loading = simple_strtol(buf, NULL, 10);
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int i;
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mutex_lock(&fw_lock);
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if (!fw_buf)
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goto out;
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switch (loading) {
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case 1:
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/* discarding any previous partial load */
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if (!test_bit(FW_STATUS_DONE, &fw_buf->status)) {
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for (i = 0; i < fw_buf->nr_pages; i++)
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__free_page(fw_buf->pages[i]);
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kfree(fw_buf->pages);
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fw_buf->pages = NULL;
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fw_buf->page_array_size = 0;
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fw_buf->nr_pages = 0;
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set_bit(FW_STATUS_LOADING, &fw_buf->status);
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}
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break;
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case 0:
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if (test_bit(FW_STATUS_LOADING, &fw_buf->status)) {
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set_bit(FW_STATUS_DONE, &fw_buf->status);
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clear_bit(FW_STATUS_LOADING, &fw_buf->status);
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complete_all(&fw_buf->completion);
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break;
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}
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/* fallthrough */
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default:
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dev_err(dev, "%s: unexpected value (%d)\n", __func__, loading);
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/* fallthrough */
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case -1:
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fw_load_abort(fw_priv);
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break;
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}
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out:
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mutex_unlock(&fw_lock);
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return count;
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}
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static DEVICE_ATTR(loading, 0644, firmware_loading_show, firmware_loading_store);
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static ssize_t firmware_data_read(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buffer, loff_t offset, size_t count)
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{
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struct device *dev = kobj_to_dev(kobj);
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struct firmware_priv *fw_priv = to_firmware_priv(dev);
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struct firmware_buf *buf;
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ssize_t ret_count;
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mutex_lock(&fw_lock);
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buf = fw_priv->buf;
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if (!buf || test_bit(FW_STATUS_DONE, &buf->status)) {
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ret_count = -ENODEV;
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goto out;
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}
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if (offset > buf->size) {
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ret_count = 0;
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goto out;
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}
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if (count > buf->size - offset)
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count = buf->size - offset;
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ret_count = count;
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while (count) {
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void *page_data;
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int page_nr = offset >> PAGE_SHIFT;
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int page_ofs = offset & (PAGE_SIZE-1);
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int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
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page_data = kmap(buf->pages[page_nr]);
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memcpy(buffer, page_data + page_ofs, page_cnt);
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kunmap(buf->pages[page_nr]);
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buffer += page_cnt;
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offset += page_cnt;
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count -= page_cnt;
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}
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out:
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mutex_unlock(&fw_lock);
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return ret_count;
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}
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static int fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size)
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{
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struct firmware_buf *buf = fw_priv->buf;
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int pages_needed = ALIGN(min_size, PAGE_SIZE) >> PAGE_SHIFT;
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/* If the array of pages is too small, grow it... */
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if (buf->page_array_size < pages_needed) {
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int new_array_size = max(pages_needed,
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buf->page_array_size * 2);
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struct page **new_pages;
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new_pages = kmalloc(new_array_size * sizeof(void *),
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GFP_KERNEL);
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if (!new_pages) {
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fw_load_abort(fw_priv);
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return -ENOMEM;
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}
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memcpy(new_pages, buf->pages,
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buf->page_array_size * sizeof(void *));
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memset(&new_pages[buf->page_array_size], 0, sizeof(void *) *
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(new_array_size - buf->page_array_size));
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kfree(buf->pages);
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buf->pages = new_pages;
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buf->page_array_size = new_array_size;
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}
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while (buf->nr_pages < pages_needed) {
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buf->pages[buf->nr_pages] =
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alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
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if (!buf->pages[buf->nr_pages]) {
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fw_load_abort(fw_priv);
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return -ENOMEM;
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}
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buf->nr_pages++;
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}
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return 0;
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}
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|
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/**
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* firmware_data_write - write method for firmware
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* @filp: open sysfs file
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* @kobj: kobject for the device
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* @bin_attr: bin_attr structure
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* @buffer: buffer being written
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* @offset: buffer offset for write in total data store area
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* @count: buffer size
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*
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* Data written to the 'data' attribute will be later handed to
|
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* the driver as a firmware image.
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**/
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static ssize_t firmware_data_write(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buffer, loff_t offset, size_t count)
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{
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struct device *dev = kobj_to_dev(kobj);
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struct firmware_priv *fw_priv = to_firmware_priv(dev);
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struct firmware_buf *buf;
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ssize_t retval;
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if (!capable(CAP_SYS_RAWIO))
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return -EPERM;
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|
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mutex_lock(&fw_lock);
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buf = fw_priv->buf;
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if (!buf || test_bit(FW_STATUS_DONE, &buf->status)) {
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retval = -ENODEV;
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goto out;
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}
|
|
|
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retval = fw_realloc_buffer(fw_priv, offset + count);
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if (retval)
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goto out;
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retval = count;
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|
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while (count) {
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void *page_data;
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int page_nr = offset >> PAGE_SHIFT;
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int page_ofs = offset & (PAGE_SIZE - 1);
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int page_cnt = min_t(size_t, PAGE_SIZE - page_ofs, count);
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page_data = kmap(buf->pages[page_nr]);
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memcpy(page_data + page_ofs, buffer, page_cnt);
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kunmap(buf->pages[page_nr]);
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buffer += page_cnt;
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offset += page_cnt;
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count -= page_cnt;
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}
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|
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buf->size = max_t(size_t, offset, buf->size);
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out:
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mutex_unlock(&fw_lock);
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return retval;
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}
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|
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static struct bin_attribute firmware_attr_data = {
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.attr = { .name = "data", .mode = 0644 },
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.size = 0,
|
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.read = firmware_data_read,
|
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.write = firmware_data_write,
|
|
};
|
|
|
|
static void firmware_class_timeout(u_long data)
|
|
{
|
|
struct firmware_priv *fw_priv = (struct firmware_priv *) data;
|
|
|
|
fw_load_abort(fw_priv);
|
|
}
|
|
|
|
static struct firmware_priv *
|
|
fw_create_instance(struct firmware *firmware, const char *fw_name,
|
|
struct device *device, bool uevent, bool nowait)
|
|
{
|
|
struct firmware_priv *fw_priv;
|
|
struct device *f_dev;
|
|
|
|
fw_priv = kzalloc(sizeof(*fw_priv), GFP_KERNEL);
|
|
if (!fw_priv) {
|
|
dev_err(device, "%s: kmalloc failed\n", __func__);
|
|
fw_priv = ERR_PTR(-ENOMEM);
|
|
goto exit;
|
|
}
|
|
|
|
fw_priv->nowait = nowait;
|
|
fw_priv->fw = firmware;
|
|
setup_timer(&fw_priv->timeout,
|
|
firmware_class_timeout, (u_long) fw_priv);
|
|
|
|
f_dev = &fw_priv->dev;
|
|
|
|
device_initialize(f_dev);
|
|
dev_set_name(f_dev, "%s", fw_name);
|
|
f_dev->parent = device;
|
|
f_dev->class = &firmware_class;
|
|
exit:
|
|
return fw_priv;
|
|
}
|
|
|
|
/* one pages buffer is mapped/unmapped only once */
|
|
static int fw_map_pages_buf(struct firmware_buf *buf)
|
|
{
|
|
buf->data = vmap(buf->pages, buf->nr_pages, 0, PAGE_KERNEL_RO);
|
|
if (!buf->data)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
/* store the pages buffer info firmware from buf */
|
|
static void fw_set_page_data(struct firmware_buf *buf, struct firmware *fw)
|
|
{
|
|
fw->priv = buf;
|
|
fw->pages = buf->pages;
|
|
fw->size = buf->size;
|
|
fw->data = buf->data;
|
|
|
|
pr_debug("%s: fw-%s buf=%p data=%p size=%u\n",
|
|
__func__, buf->fw_id, buf, buf->data,
|
|
(unsigned int)buf->size);
|
|
}
|
|
|
|
static void _request_firmware_cleanup(const struct firmware **firmware_p)
|
|
{
|
|
release_firmware(*firmware_p);
|
|
*firmware_p = NULL;
|
|
}
|
|
|
|
static struct firmware_priv *
|
|
_request_firmware_prepare(const struct firmware **firmware_p, const char *name,
|
|
struct device *device, bool uevent, bool nowait)
|
|
{
|
|
struct firmware *firmware;
|
|
struct firmware_priv *fw_priv = NULL;
|
|
struct firmware_buf *buf;
|
|
int ret;
|
|
|
|
if (!firmware_p)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
*firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL);
|
|
if (!firmware) {
|
|
dev_err(device, "%s: kmalloc(struct firmware) failed\n",
|
|
__func__);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
if (fw_get_builtin_firmware(firmware, name)) {
|
|
dev_dbg(device, "firmware: using built-in firmware %s\n", name);
|
|
return NULL;
|
|
}
|
|
|
|
ret = fw_lookup_and_allocate_buf(name, &fw_cache, &buf);
|
|
if (!ret)
|
|
fw_priv = fw_create_instance(firmware, name, device,
|
|
uevent, nowait);
|
|
|
|
if (IS_ERR(fw_priv) || ret < 0) {
|
|
kfree(firmware);
|
|
*firmware_p = NULL;
|
|
return ERR_PTR(-ENOMEM);
|
|
} else if (fw_priv) {
|
|
fw_priv->buf = buf;
|
|
|
|
/*
|
|
* bind with 'buf' now to avoid warning in failure path
|
|
* of requesting firmware.
|
|
*/
|
|
firmware->priv = buf;
|
|
return fw_priv;
|
|
}
|
|
|
|
/* share the cached buf, which is inprogessing or completed */
|
|
check_status:
|
|
mutex_lock(&fw_lock);
|
|
if (test_bit(FW_STATUS_ABORT, &buf->status)) {
|
|
fw_priv = ERR_PTR(-ENOENT);
|
|
_request_firmware_cleanup(firmware_p);
|
|
goto exit;
|
|
} else if (test_bit(FW_STATUS_DONE, &buf->status)) {
|
|
fw_priv = NULL;
|
|
fw_set_page_data(buf, firmware);
|
|
goto exit;
|
|
}
|
|
mutex_unlock(&fw_lock);
|
|
wait_for_completion(&buf->completion);
|
|
goto check_status;
|
|
|
|
exit:
|
|
mutex_unlock(&fw_lock);
|
|
return fw_priv;
|
|
}
|
|
|
|
static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
|
|
long timeout)
|
|
{
|
|
int retval = 0;
|
|
struct device *f_dev = &fw_priv->dev;
|
|
struct firmware_buf *buf = fw_priv->buf;
|
|
|
|
dev_set_uevent_suppress(f_dev, true);
|
|
|
|
/* Need to pin this module until class device is destroyed */
|
|
__module_get(THIS_MODULE);
|
|
|
|
retval = device_add(f_dev);
|
|
if (retval) {
|
|
dev_err(f_dev, "%s: device_register failed\n", __func__);
|
|
goto err_put_dev;
|
|
}
|
|
|
|
retval = device_create_bin_file(f_dev, &firmware_attr_data);
|
|
if (retval) {
|
|
dev_err(f_dev, "%s: sysfs_create_bin_file failed\n", __func__);
|
|
goto err_del_dev;
|
|
}
|
|
|
|
retval = device_create_file(f_dev, &dev_attr_loading);
|
|
if (retval) {
|
|
dev_err(f_dev, "%s: device_create_file failed\n", __func__);
|
|
goto err_del_bin_attr;
|
|
}
|
|
|
|
if (uevent) {
|
|
dev_set_uevent_suppress(f_dev, false);
|
|
dev_dbg(f_dev, "firmware: requesting %s\n", buf->fw_id);
|
|
if (timeout != MAX_SCHEDULE_TIMEOUT)
|
|
mod_timer(&fw_priv->timeout,
|
|
round_jiffies_up(jiffies + timeout));
|
|
|
|
kobject_uevent(&fw_priv->dev.kobj, KOBJ_ADD);
|
|
}
|
|
|
|
wait_for_completion(&buf->completion);
|
|
|
|
del_timer_sync(&fw_priv->timeout);
|
|
|
|
mutex_lock(&fw_lock);
|
|
if (!buf->size || test_bit(FW_STATUS_ABORT, &buf->status))
|
|
retval = -ENOENT;
|
|
|
|
if (!retval)
|
|
retval = fw_map_pages_buf(buf);
|
|
|
|
/* pass the pages buffer to driver at the last minute */
|
|
fw_set_page_data(buf, fw_priv->fw);
|
|
|
|
fw_priv->buf = NULL;
|
|
mutex_unlock(&fw_lock);
|
|
|
|
device_remove_file(f_dev, &dev_attr_loading);
|
|
err_del_bin_attr:
|
|
device_remove_bin_file(f_dev, &firmware_attr_data);
|
|
err_del_dev:
|
|
device_del(f_dev);
|
|
err_put_dev:
|
|
put_device(f_dev);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* request_firmware: - send firmware request and wait for it
|
|
* @firmware_p: pointer to firmware image
|
|
* @name: name of firmware file
|
|
* @device: device for which firmware is being loaded
|
|
*
|
|
* @firmware_p will be used to return a firmware image by the name
|
|
* of @name for device @device.
|
|
*
|
|
* Should be called from user context where sleeping is allowed.
|
|
*
|
|
* @name will be used as $FIRMWARE in the uevent environment and
|
|
* should be distinctive enough not to be confused with any other
|
|
* firmware image for this or any other device.
|
|
*
|
|
* Caller must hold the reference count of @device.
|
|
**/
|
|
int
|
|
request_firmware(const struct firmware **firmware_p, const char *name,
|
|
struct device *device)
|
|
{
|
|
struct firmware_priv *fw_priv;
|
|
int ret;
|
|
|
|
fw_priv = _request_firmware_prepare(firmware_p, name, device, true,
|
|
false);
|
|
if (IS_ERR_OR_NULL(fw_priv))
|
|
return PTR_RET(fw_priv);
|
|
|
|
ret = usermodehelper_read_trylock();
|
|
if (WARN_ON(ret)) {
|
|
dev_err(device, "firmware: %s will not be loaded\n", name);
|
|
} else {
|
|
ret = _request_firmware_load(fw_priv, true,
|
|
firmware_loading_timeout());
|
|
usermodehelper_read_unlock();
|
|
}
|
|
if (ret)
|
|
_request_firmware_cleanup(firmware_p);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* release_firmware: - release the resource associated with a firmware image
|
|
* @fw: firmware resource to release
|
|
**/
|
|
void release_firmware(const struct firmware *fw)
|
|
{
|
|
if (fw) {
|
|
if (!fw_is_builtin_firmware(fw))
|
|
firmware_free_data(fw);
|
|
kfree(fw);
|
|
}
|
|
}
|
|
|
|
/* Async support */
|
|
struct firmware_work {
|
|
struct work_struct work;
|
|
struct module *module;
|
|
const char *name;
|
|
struct device *device;
|
|
void *context;
|
|
void (*cont)(const struct firmware *fw, void *context);
|
|
bool uevent;
|
|
};
|
|
|
|
static void request_firmware_work_func(struct work_struct *work)
|
|
{
|
|
struct firmware_work *fw_work;
|
|
const struct firmware *fw;
|
|
struct firmware_priv *fw_priv;
|
|
long timeout;
|
|
int ret;
|
|
|
|
fw_work = container_of(work, struct firmware_work, work);
|
|
fw_priv = _request_firmware_prepare(&fw, fw_work->name, fw_work->device,
|
|
fw_work->uevent, true);
|
|
if (IS_ERR_OR_NULL(fw_priv)) {
|
|
ret = PTR_RET(fw_priv);
|
|
goto out;
|
|
}
|
|
|
|
timeout = usermodehelper_read_lock_wait(firmware_loading_timeout());
|
|
if (timeout) {
|
|
ret = _request_firmware_load(fw_priv, fw_work->uevent, timeout);
|
|
usermodehelper_read_unlock();
|
|
} else {
|
|
dev_dbg(fw_work->device, "firmware: %s loading timed out\n",
|
|
fw_work->name);
|
|
ret = -EAGAIN;
|
|
}
|
|
if (ret)
|
|
_request_firmware_cleanup(&fw);
|
|
|
|
out:
|
|
fw_work->cont(fw, fw_work->context);
|
|
put_device(fw_work->device);
|
|
|
|
module_put(fw_work->module);
|
|
kfree(fw_work);
|
|
}
|
|
|
|
/**
|
|
* request_firmware_nowait - asynchronous version of request_firmware
|
|
* @module: module requesting the firmware
|
|
* @uevent: sends uevent to copy the firmware image if this flag
|
|
* is non-zero else the firmware copy must be done manually.
|
|
* @name: name of firmware file
|
|
* @device: device for which firmware is being loaded
|
|
* @gfp: allocation flags
|
|
* @context: will be passed over to @cont, and
|
|
* @fw may be %NULL if firmware request fails.
|
|
* @cont: function will be called asynchronously when the firmware
|
|
* request is over.
|
|
*
|
|
* Caller must hold the reference count of @device.
|
|
*
|
|
* Asynchronous variant of request_firmware() for user contexts where
|
|
* it is not possible to sleep for long time. It can't be called
|
|
* in atomic contexts.
|
|
**/
|
|
int
|
|
request_firmware_nowait(
|
|
struct module *module, bool uevent,
|
|
const char *name, struct device *device, gfp_t gfp, void *context,
|
|
void (*cont)(const struct firmware *fw, void *context))
|
|
{
|
|
struct firmware_work *fw_work;
|
|
|
|
fw_work = kzalloc(sizeof (struct firmware_work), gfp);
|
|
if (!fw_work)
|
|
return -ENOMEM;
|
|
|
|
fw_work->module = module;
|
|
fw_work->name = name;
|
|
fw_work->device = device;
|
|
fw_work->context = context;
|
|
fw_work->cont = cont;
|
|
fw_work->uevent = uevent;
|
|
|
|
if (!try_module_get(module)) {
|
|
kfree(fw_work);
|
|
return -EFAULT;
|
|
}
|
|
|
|
get_device(fw_work->device);
|
|
INIT_WORK(&fw_work->work, request_firmware_work_func);
|
|
schedule_work(&fw_work->work);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cache_firmware - cache one firmware image in kernel memory space
|
|
* @fw_name: the firmware image name
|
|
*
|
|
* Cache firmware in kernel memory so that drivers can use it when
|
|
* system isn't ready for them to request firmware image from userspace.
|
|
* Once it returns successfully, driver can use request_firmware or its
|
|
* nowait version to get the cached firmware without any interacting
|
|
* with userspace
|
|
*
|
|
* Return 0 if the firmware image has been cached successfully
|
|
* Return !0 otherwise
|
|
*
|
|
*/
|
|
int cache_firmware(const char *fw_name)
|
|
{
|
|
int ret;
|
|
const struct firmware *fw;
|
|
|
|
pr_debug("%s: %s\n", __func__, fw_name);
|
|
|
|
ret = request_firmware(&fw, fw_name, NULL);
|
|
if (!ret)
|
|
kfree(fw);
|
|
|
|
pr_debug("%s: %s ret=%d\n", __func__, fw_name, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* uncache_firmware - remove one cached firmware image
|
|
* @fw_name: the firmware image name
|
|
*
|
|
* Uncache one firmware image which has been cached successfully
|
|
* before.
|
|
*
|
|
* Return 0 if the firmware cache has been removed successfully
|
|
* Return !0 otherwise
|
|
*
|
|
*/
|
|
int uncache_firmware(const char *fw_name)
|
|
{
|
|
struct firmware_buf *buf;
|
|
struct firmware fw;
|
|
|
|
pr_debug("%s: %s\n", __func__, fw_name);
|
|
|
|
if (fw_get_builtin_firmware(&fw, fw_name))
|
|
return 0;
|
|
|
|
buf = fw_lookup_buf(fw_name);
|
|
if (buf) {
|
|
fw_free_buf(buf);
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int __init firmware_class_init(void)
|
|
{
|
|
fw_cache_init();
|
|
return class_register(&firmware_class);
|
|
}
|
|
|
|
static void __exit firmware_class_exit(void)
|
|
{
|
|
class_unregister(&firmware_class);
|
|
}
|
|
|
|
fs_initcall(firmware_class_init);
|
|
module_exit(firmware_class_exit);
|
|
|
|
EXPORT_SYMBOL(release_firmware);
|
|
EXPORT_SYMBOL(request_firmware);
|
|
EXPORT_SYMBOL(request_firmware_nowait);
|
|
EXPORT_SYMBOL_GPL(cache_firmware);
|
|
EXPORT_SYMBOL_GPL(uncache_firmware);
|