[PATCH 1/2] iio:core: Introduce unlocked version of iio_map_array_unregister()

[Lino Sanfilippo]

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 <linosanfili...@gmx.de>
---
 drivers/iio/inkern.c | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index ede99e0..39c1d63 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);
-- 
2.7.4