![Martin Schwidefsky](/assets/img/avatar_default.png)
The module exit function of the smsgiucv module uses the incorrect CP command to disable SMSG messages. The correct command is "SET SMSG OFF". Use it. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
246 lines
5.6 KiB
C
246 lines
5.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* IUCV special message driver
|
|
*
|
|
* Copyright IBM Corp. 2003, 2009
|
|
*
|
|
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/device.h>
|
|
#include <linux/slab.h>
|
|
#include <net/iucv/iucv.h>
|
|
#include <asm/cpcmd.h>
|
|
#include <asm/ebcdic.h>
|
|
#include "smsgiucv.h"
|
|
|
|
struct smsg_callback {
|
|
struct list_head list;
|
|
const char *prefix;
|
|
int len;
|
|
void (*callback)(const char *from, char *str);
|
|
};
|
|
|
|
MODULE_AUTHOR
|
|
("(C) 2003 IBM Corporation by Martin Schwidefsky (schwidefsky@de.ibm.com)");
|
|
MODULE_DESCRIPTION ("Linux for S/390 IUCV special message driver");
|
|
|
|
static struct iucv_path *smsg_path;
|
|
/* dummy device used as trigger for PM functions */
|
|
static struct device *smsg_dev;
|
|
|
|
static DEFINE_SPINLOCK(smsg_list_lock);
|
|
static LIST_HEAD(smsg_list);
|
|
static int iucv_path_connected;
|
|
|
|
static int smsg_path_pending(struct iucv_path *, u8 *, u8 *);
|
|
static void smsg_message_pending(struct iucv_path *, struct iucv_message *);
|
|
|
|
static struct iucv_handler smsg_handler = {
|
|
.path_pending = smsg_path_pending,
|
|
.message_pending = smsg_message_pending,
|
|
};
|
|
|
|
static int smsg_path_pending(struct iucv_path *path, u8 *ipvmid, u8 *ipuser)
|
|
{
|
|
if (strncmp(ipvmid, "*MSG ", 8) != 0)
|
|
return -EINVAL;
|
|
/* Path pending from *MSG. */
|
|
return iucv_path_accept(path, &smsg_handler, "SMSGIUCV ", NULL);
|
|
}
|
|
|
|
static void smsg_message_pending(struct iucv_path *path,
|
|
struct iucv_message *msg)
|
|
{
|
|
struct smsg_callback *cb;
|
|
unsigned char *buffer;
|
|
unsigned char sender[9];
|
|
int rc, i;
|
|
|
|
buffer = kmalloc(msg->length + 1, GFP_ATOMIC | GFP_DMA);
|
|
if (!buffer) {
|
|
iucv_message_reject(path, msg);
|
|
return;
|
|
}
|
|
rc = iucv_message_receive(path, msg, 0, buffer, msg->length, NULL);
|
|
if (rc == 0) {
|
|
buffer[msg->length] = 0;
|
|
EBCASC(buffer, msg->length);
|
|
memcpy(sender, buffer, 8);
|
|
sender[8] = 0;
|
|
/* Remove trailing whitespace from the sender name. */
|
|
for (i = 7; i >= 0; i--) {
|
|
if (sender[i] != ' ' && sender[i] != '\t')
|
|
break;
|
|
sender[i] = 0;
|
|
}
|
|
spin_lock(&smsg_list_lock);
|
|
list_for_each_entry(cb, &smsg_list, list)
|
|
if (strncmp(buffer + 8, cb->prefix, cb->len) == 0) {
|
|
cb->callback(sender, buffer + 8);
|
|
break;
|
|
}
|
|
spin_unlock(&smsg_list_lock);
|
|
}
|
|
kfree(buffer);
|
|
}
|
|
|
|
int smsg_register_callback(const char *prefix,
|
|
void (*callback)(const char *from, char *str))
|
|
{
|
|
struct smsg_callback *cb;
|
|
|
|
cb = kmalloc(sizeof(struct smsg_callback), GFP_KERNEL);
|
|
if (!cb)
|
|
return -ENOMEM;
|
|
cb->prefix = prefix;
|
|
cb->len = strlen(prefix);
|
|
cb->callback = callback;
|
|
spin_lock_bh(&smsg_list_lock);
|
|
list_add_tail(&cb->list, &smsg_list);
|
|
spin_unlock_bh(&smsg_list_lock);
|
|
return 0;
|
|
}
|
|
|
|
void smsg_unregister_callback(const char *prefix,
|
|
void (*callback)(const char *from,
|
|
char *str))
|
|
{
|
|
struct smsg_callback *cb, *tmp;
|
|
|
|
spin_lock_bh(&smsg_list_lock);
|
|
cb = NULL;
|
|
list_for_each_entry(tmp, &smsg_list, list)
|
|
if (tmp->callback == callback &&
|
|
strcmp(tmp->prefix, prefix) == 0) {
|
|
cb = tmp;
|
|
list_del(&cb->list);
|
|
break;
|
|
}
|
|
spin_unlock_bh(&smsg_list_lock);
|
|
kfree(cb);
|
|
}
|
|
|
|
static int smsg_pm_freeze(struct device *dev)
|
|
{
|
|
#ifdef CONFIG_PM_DEBUG
|
|
printk(KERN_WARNING "smsg_pm_freeze\n");
|
|
#endif
|
|
if (smsg_path && iucv_path_connected) {
|
|
iucv_path_sever(smsg_path, NULL);
|
|
iucv_path_connected = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int smsg_pm_restore_thaw(struct device *dev)
|
|
{
|
|
int rc;
|
|
|
|
#ifdef CONFIG_PM_DEBUG
|
|
printk(KERN_WARNING "smsg_pm_restore_thaw\n");
|
|
#endif
|
|
if (smsg_path && !iucv_path_connected) {
|
|
memset(smsg_path, 0, sizeof(*smsg_path));
|
|
smsg_path->msglim = 255;
|
|
smsg_path->flags = 0;
|
|
rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ",
|
|
NULL, NULL, NULL);
|
|
#ifdef CONFIG_PM_DEBUG
|
|
if (rc)
|
|
printk(KERN_ERR
|
|
"iucv_path_connect returned with rc %i\n", rc);
|
|
#endif
|
|
if (!rc)
|
|
iucv_path_connected = 1;
|
|
cpcmd("SET SMSG IUCV", NULL, 0, NULL);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops smsg_pm_ops = {
|
|
.freeze = smsg_pm_freeze,
|
|
.thaw = smsg_pm_restore_thaw,
|
|
.restore = smsg_pm_restore_thaw,
|
|
};
|
|
|
|
static struct device_driver smsg_driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = SMSGIUCV_DRV_NAME,
|
|
.bus = &iucv_bus,
|
|
.pm = &smsg_pm_ops,
|
|
};
|
|
|
|
static void __exit smsg_exit(void)
|
|
{
|
|
cpcmd("SET SMSG OFF", NULL, 0, NULL);
|
|
device_unregister(smsg_dev);
|
|
iucv_unregister(&smsg_handler, 1);
|
|
driver_unregister(&smsg_driver);
|
|
}
|
|
|
|
static int __init smsg_init(void)
|
|
{
|
|
int rc;
|
|
|
|
if (!MACHINE_IS_VM) {
|
|
rc = -EPROTONOSUPPORT;
|
|
goto out;
|
|
}
|
|
rc = driver_register(&smsg_driver);
|
|
if (rc != 0)
|
|
goto out;
|
|
rc = iucv_register(&smsg_handler, 1);
|
|
if (rc)
|
|
goto out_driver;
|
|
smsg_path = iucv_path_alloc(255, 0, GFP_KERNEL);
|
|
if (!smsg_path) {
|
|
rc = -ENOMEM;
|
|
goto out_register;
|
|
}
|
|
rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ",
|
|
NULL, NULL, NULL);
|
|
if (rc)
|
|
goto out_free_path;
|
|
else
|
|
iucv_path_connected = 1;
|
|
smsg_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
|
|
if (!smsg_dev) {
|
|
rc = -ENOMEM;
|
|
goto out_free_path;
|
|
}
|
|
dev_set_name(smsg_dev, "smsg_iucv");
|
|
smsg_dev->bus = &iucv_bus;
|
|
smsg_dev->parent = iucv_root;
|
|
smsg_dev->release = (void (*)(struct device *))kfree;
|
|
smsg_dev->driver = &smsg_driver;
|
|
rc = device_register(smsg_dev);
|
|
if (rc)
|
|
goto out_put;
|
|
|
|
cpcmd("SET SMSG IUCV", NULL, 0, NULL);
|
|
return 0;
|
|
|
|
out_put:
|
|
put_device(smsg_dev);
|
|
out_free_path:
|
|
iucv_path_free(smsg_path);
|
|
smsg_path = NULL;
|
|
out_register:
|
|
iucv_unregister(&smsg_handler, 1);
|
|
out_driver:
|
|
driver_unregister(&smsg_driver);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
module_init(smsg_init);
|
|
module_exit(smsg_exit);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
EXPORT_SYMBOL(smsg_register_callback);
|
|
EXPORT_SYMBOL(smsg_unregister_callback);
|