diff options
| author | Lino Sanfilippo <LinoSanfilippo@gmx.de> | 2020-11-28 14:44:18 +0100 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2020-12-03 19:40:25 +0000 |
| commit | cc9fb60eaf092be8f7f51a5cbfa23e70edfa453b (patch) | |
| tree | 91535d2d3d5fd314ccef48128bfda5aa93d2cdeb /drivers/iio/inkern.c | |
| parent | 619c7e60ff997ea2fafebc8473724d202d5246aa (diff) | |
iio:core: Introduce unlocked version of iio_map_array_unregister()
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>
Diffstat (limited to 'drivers/iio/inkern.c')
| -rw-r--r-- | drivers/iio/inkern.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index ede99e0d5371..39c1d635dc03 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -24,6 +24,21 @@ struct iio_map_internal { static LIST_HEAD(iio_map_list); 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 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 ret = -ENODEV; - struct iio_map_internal *mapi, *next; + int ret; mutex_lock(&iio_map_list_lock); - 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; - } - } + ret = iio_map_array_unregister_locked(indio_dev); mutex_unlock(&iio_map_list_lock); + return ret; } EXPORT_SYMBOL_GPL(iio_map_array_unregister); |