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iio:core: Introduce unlocked version of iio_map_array_unregister()

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Introduce an unlocked version of iio_map_array_unregister(). This function
can help to unwind in case of error while the iio_map_list_lock mutex is
held.

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/1606571059-13974-1-git-send-email-LinoSanfilippo@gmx.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Lino Sanfilippo 2020-11-28 14:44:18 +01:00 • committed by Jonathan Cameron
parent 619c7e60ff
commit cc9fb60eaf
1 changed files with 18 additions and 9 deletions
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27
drivers/iio/inkern.c
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@ -24,6 +24,21 @@ struct iio_map_internal {
static LIST_HEAD(iio_map_list); static LIST_HEAD(iio_map_list);
static DEFINE_MUTEX(iio_map_list_lock); static DEFINE_MUTEX(iio_map_list_lock);
static int iio_map_array_unregister_locked(struct iio_dev *indio_dev)
{
int ret = -ENODEV;
struct iio_map_internal *mapi, *next;
list_for_each_entry_safe(mapi, next, &iio_map_list, l) {
if (indio_dev == mapi->indio_dev) {
list_del(&mapi->l);
kfree(mapi);
ret = 0;
}
}
return ret;
}
int iio_map_array_register(struct iio_dev *indio_dev, struct iio_map *maps) int iio_map_array_register(struct iio_dev *indio_dev, struct iio_map *maps)
{ {
int i = 0, ret = 0; int i = 0, ret = 0;
@ -57,18 +72,12 @@ EXPORT_SYMBOL_GPL(iio_map_array_register);
*/ */
int iio_map_array_unregister(struct iio_dev *indio_dev) int iio_map_array_unregister(struct iio_dev *indio_dev)
{ {
int ret = -ENODEV; int ret;
struct iio_map_internal *mapi, *next;
mutex_lock(&iio_map_list_lock); mutex_lock(&iio_map_list_lock);
list_for_each_entry_safe(mapi, next, &iio_map_list, l) { ret = iio_map_array_unregister_locked(indio_dev);
if (indio_dev == mapi->indio_dev) {
list_del(&mapi->l);
kfree(mapi);
ret = 0;
}
}
mutex_unlock(&iio_map_list_lock); mutex_unlock(&iio_map_list_lock);
return ret; return ret;
} }
EXPORT_SYMBOL_GPL(iio_map_array_unregister); EXPORT_SYMBOL_GPL(iio_map_array_unregister);