sbus: autoconvert trivial BKL users to private mutex
All these files use the big kernel lock in a trivial way to serialize their private file operations, typically resulting from an earlier semi-automatic pushdown from VFS. None of these drivers appears to want to lock against other code, and they all use the BKL as the top-level lock in their file operations, meaning that there is no lock-order inversion problem. Consequently, we can remove the BKL completely, replacing it with a per-file mutex in every case. Using a scripted approach means we can avoid typos. file=$1 name=$2 if grep -q lock_kernel ${file} ; then if grep -q 'include.*linux.mutex.h' ${file} ; then sed -i '/include.*<linux\/smp_lock.h>/d' ${file} else sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file} fi sed -i ${file} \ -e "/^#include.*linux.mutex.h/,$ { 1,/^\(static\|int\|long\)/ { /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex); } }" \ -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \ -e '/[ ]*cycle_kernel_lock();/d' else sed -i -e '/include.*\<smp_lock.h\>/d' ${file} \ -e '/cycle_kernel_lock()/d' fi Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -13,7 +13,7 @@
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#include <linux/miscdevice.h>
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#include <linux/ioport.h> /* request_region */
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#include <linux/slab.h>
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#include <linux/smp_lock.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <asm/atomic.h>
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@ -26,6 +26,7 @@
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#define DRIVER_NAME "d7s"
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#define PFX DRIVER_NAME ": "
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static DEFINE_MUTEX(d7s_mutex);
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static int sol_compat = 0; /* Solaris compatibility mode */
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/* Solaris compatibility flag -
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@ -74,7 +75,6 @@ static int d7s_open(struct inode *inode, struct file *f)
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{
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if (D7S_MINOR != iminor(inode))
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return -ENODEV;
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cycle_kernel_lock();
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atomic_inc(&d7s_users);
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return 0;
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}
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@ -110,7 +110,7 @@ static long d7s_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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if (D7S_MINOR != iminor(file->f_path.dentry->d_inode))
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return -ENODEV;
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lock_kernel();
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mutex_lock(&d7s_mutex);
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switch (cmd) {
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case D7SIOCWR:
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/* assign device register values we mask-out D7S_FLIP
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@ -151,7 +151,7 @@ static long d7s_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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writeb(regs, p->regs);
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break;
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};
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unlock_kernel();
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mutex_unlock(&d7s_mutex);
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return error;
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}
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@ -27,7 +27,6 @@
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#include <linux/kmod.h>
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#include <linux/reboot.h>
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#include <linux/slab.h>
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#include <linux/smp_lock.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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@ -699,7 +698,6 @@ envctrl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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static int
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envctrl_open(struct inode *inode, struct file *file)
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{
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cycle_kernel_lock();
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file->private_data = NULL;
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return 0;
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}
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@ -10,7 +10,7 @@
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#include <linux/fcntl.h>
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#include <linux/poll.h>
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#include <linux/init.h>
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#include <linux/smp_lock.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/mm.h>
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#include <linux/of.h>
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@ -22,6 +22,7 @@
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#include <asm/io.h>
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#include <asm/upa.h>
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static DEFINE_MUTEX(flash_mutex);
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static DEFINE_SPINLOCK(flash_lock);
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static struct {
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unsigned long read_base; /* Physical read address */
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@ -80,7 +81,7 @@ flash_mmap(struct file *file, struct vm_area_struct *vma)
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static long long
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flash_llseek(struct file *file, long long offset, int origin)
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{
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lock_kernel();
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mutex_lock(&flash_mutex);
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switch (origin) {
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case 0:
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file->f_pos = offset;
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@ -94,10 +95,10 @@ flash_llseek(struct file *file, long long offset, int origin)
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file->f_pos = flash.read_size;
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break;
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default:
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unlock_kernel();
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mutex_unlock(&flash_mutex);
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return -EINVAL;
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}
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unlock_kernel();
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mutex_unlock(&flash_mutex);
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return file->f_pos;
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}
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@ -125,13 +126,13 @@ flash_read(struct file * file, char __user * buf,
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static int
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flash_open(struct inode *inode, struct file *file)
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{
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lock_kernel();
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mutex_lock(&flash_mutex);
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if (test_and_set_bit(0, (void *)&flash.busy) != 0) {
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unlock_kernel();
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mutex_unlock(&flash_mutex);
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return -EBUSY;
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}
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unlock_kernel();
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mutex_unlock(&flash_mutex);
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return 0;
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}
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@ -33,7 +33,7 @@
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/smp_lock.h>
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#include <linux/mutex.h>
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#include <linux/string.h>
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#include <linux/miscdevice.h>
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#include <linux/init.h>
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@ -61,6 +61,7 @@ typedef struct openprom_private_data
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} DATA;
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/* ID of the PROM node containing all of the EEPROM options. */
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static DEFINE_MUTEX(openprom_mutex);
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static struct device_node *options_node;
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/*
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@ -316,7 +317,7 @@ static long openprom_sunos_ioctl(struct file * file,
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if (bufsize < 0)
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return bufsize;
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lock_kernel();
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mutex_lock(&openprom_mutex);
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switch (cmd) {
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case OPROMGETOPT:
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@ -367,7 +368,7 @@ static long openprom_sunos_ioctl(struct file * file,
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}
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kfree(opp);
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unlock_kernel();
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mutex_unlock(&openprom_mutex);
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return error;
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}
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@ -558,7 +559,7 @@ static int openprom_bsd_ioctl(struct file * file,
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void __user *argp = (void __user *)arg;
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int err;
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lock_kernel();
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mutex_lock(&openprom_mutex);
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switch (cmd) {
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case OPIOCGET:
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err = opiocget(argp, data);
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err = -EINVAL;
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break;
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};
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unlock_kernel();
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mutex_unlock(&openprom_mutex);
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return err;
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}
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@ -697,11 +698,11 @@ static int openprom_open(struct inode * inode, struct file * file)
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if (!data)
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return -ENOMEM;
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lock_kernel();
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mutex_lock(&openprom_mutex);
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data->current_node = of_find_node_by_path("/");
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data->lastnode = data->current_node;
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file->private_data = (void *) data;
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unlock_kernel();
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mutex_unlock(&openprom_mutex);
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return 0;
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}
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@ -9,7 +9,7 @@
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/smp_lock.h>
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#include <linux/mutex.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/miscdevice.h>
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#define UCTRL_STAT_RXNE_STA 0x04 /* receive FIFO not empty status */
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#define UCTRL_STAT_RXO_STA 0x08 /* receive FIFO overflow status */
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static DEFINE_MUTEX(uctrl_mutex);
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static const char *uctrl_extstatus[16] = {
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"main power available",
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"internal battery attached",
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static int
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uctrl_open(struct inode *inode, struct file *file)
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{
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lock_kernel();
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mutex_lock(&uctrl_mutex);
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uctrl_get_event_status(global_driver);
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uctrl_get_external_status(global_driver);
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unlock_kernel();
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mutex_unlock(&uctrl_mutex);
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return 0;
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}
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