mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-29 22:02:02 +00:00
Code Issues Releases Wiki Activity

iio: Refuse to register triggers with duplicate names

Browse source 
The trigger name is documented as unique but drivers are currently
allowed to register triggers with duplicate names. This should be
considered a bug since it makes the 'current_trigger' interface
unusable.

Signed-off-by: Crestez Dan Leonard <leonard.crestez@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Crestez Dan Leonard 2016-05-23 21:40:01 +03:00 committed by Jonathan Cameron
parent deb4d1fdcb
commit 3b8e73ec82
1 changed files with 22 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
drivers/iio/industrialio-trigger.c
View file

@ -64,6 +64,8 @@ static struct attribute *iio_trig_dev_attrs[] = {
};
ATTRIBUTE_GROUPS(iio_trig_dev);
static struct iio_trigger *__iio_trigger_find_by_name(const char *name);
int iio_trigger_register(struct iio_trigger *trig_info)
{
int ret;
@ -86,11 +88,19 @@ int iio_trigger_register(struct iio_trigger *trig_info)
/* Add to list of available triggers held by the IIO core */
mutex_lock(&iio_trigger_list_lock);
if (__iio_trigger_find_by_name(trig_info->name)) {
pr_err("Duplicate trigger name '%s'\n", trig_info->name);
ret = -EEXIST;
goto error_device_del;
}
list_add_tail(&trig_info->list, &iio_trigger_list);
mutex_unlock(&iio_trigger_list_lock);
return 0;
error_device_del:
mutex_unlock(&iio_trigger_list_lock);
device_del(&trig_info->dev);
error_unregister_id:
ida_simple_remove(&iio_trigger_ida, trig_info->id);
return ret;
@ -109,6 +119,18 @@ void iio_trigger_unregister(struct iio_trigger *trig_info)
}
EXPORT_SYMBOL(iio_trigger_unregister);
/* Search for trigger by name, assuming iio_trigger_list_lock held */
static struct iio_trigger *__iio_trigger_find_by_name(const char *name)
{
struct iio_trigger *iter;
list_for_each_entry(iter, &iio_trigger_list, list)
if (!strcmp(iter->name, name))
return iter;
return NULL;
}
static struct iio_trigger *iio_trigger_find_by_name(const char *name,
size_t len)
{