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[media] tm6000: Use just one lock for devlist

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This avoids a race condition

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2010-10-11 09:57:34 -03:00
parent 06f08e3a4d
commit 4ae1839800
1 changed files with 4 additions and 9 deletions
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13
drivers/staging/tm6000/tm6000-core.c
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@ -644,7 +644,6 @@ void tm6000_add_into_devlist(struct tm6000_core *dev)
*/
static LIST_HEAD(tm6000_extension_devlist);
static DEFINE_MUTEX(tm6000_extension_devlist_lock);
int tm6000_call_fillbuf(struct tm6000_core *dev, enum tm6000_ops_type type,
char *buf, int size)
@ -668,14 +667,12 @@ int tm6000_register_extension(struct tm6000_ops *ops)
struct tm6000_core *dev = NULL;
mutex_lock(&tm6000_devlist_mutex);
mutex_lock(&tm6000_extension_devlist_lock);
list_add_tail(&ops->next, &tm6000_extension_devlist);
list_for_each_entry(dev, &tm6000_devlist, devlist) {
ops->init(dev);
printk(KERN_INFO "%s: Initialized (%s) extension\n",
dev->name, ops->name);
}
mutex_unlock(&tm6000_extension_devlist_lock);
mutex_unlock(&tm6000_devlist_mutex);
return 0;
}
@ -691,10 +688,8 @@ void tm6000_unregister_extension(struct tm6000_ops *ops)
ops->fini(dev);
}
mutex_lock(&tm6000_extension_devlist_lock);
printk(KERN_INFO "tm6000: Remove (%s) extension\n", ops->name);
list_del(&ops->next);
mutex_unlock(&tm6000_extension_devlist_lock);
mutex_unlock(&tm6000_devlist_mutex);
}
EXPORT_SYMBOL(tm6000_unregister_extension);
@ -703,26 +698,26 @@ void tm6000_init_extension(struct tm6000_core *dev)
{
struct tm6000_ops *ops = NULL;
mutex_lock(&tm6000_extension_devlist_lock);
mutex_lock(&tm6000_devlist_mutex);
if (!list_empty(&tm6000_extension_devlist)) {
list_for_each_entry(ops, &tm6000_extension_devlist, next) {
if (ops->init)
ops->init(dev);
}
}
mutex_unlock(&tm6000_extension_devlist_lock);
mutex_unlock(&tm6000_devlist_mutex);
}
void tm6000_close_extension(struct tm6000_core *dev)
{
struct tm6000_ops *ops = NULL;
mutex_lock(&tm6000_extension_devlist_lock);
mutex_lock(&tm6000_devlist_mutex);
if (!list_empty(&tm6000_extension_devlist)) {
list_for_each_entry(ops, &tm6000_extension_devlist, next) {
if (ops->fini)
ops->fini(dev);
}
}
mutex_unlock(&tm6000_extension_devlist_lock);
mutex_lock(&tm6000_devlist_mutex);
}