[PATCH v2] [media] v4l2-async: Pass the v4l2_async_subdev to the unbind callback

[Alban Bedel]

v4l2_async_cleanup() is always called before calling the unbind()
callback. However v4l2_async_cleanup() clears the asd member, so when
calling the unbind() callback the v4l2_async_subdev is always NULL. To
fix this save the asd before calling v4l2_async_cleanup().

Signed-off-by: Alban Bedel <alban.be...@avionic-design.de>
Acked-by: Sakari Ailus <sakari.ai...@linux.intel.com>
Reviewed-by: Javier Martinez Canillas <jav...@osg.samsung.com>
---
 drivers/media/v4l2-core/v4l2-async.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-async.c 
b/drivers/media/v4l2-core/v4l2-async.c
index a4b224d..ceb28d4 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -220,6 +220,7 @@ void v4l2_async_notifier_unregister(struct 
v4l2_async_notifier *notifier)
        list_del(&notifier->list);
 
        list_for_each_entry_safe(sd, tmp, &notifier->done, async_list) {
+               struct v4l2_async_subdev *asd = sd->asd;
                struct device *d;
 
                d = get_device(sd->dev);
@@ -230,7 +231,7 @@ void v4l2_async_notifier_unregister(struct 
v4l2_async_notifier *notifier)
                device_release_driver(d);
 
                if (notifier->unbind)
-                       notifier->unbind(notifier, sd, sd->asd);
+                       notifier->unbind(notifier, sd, asd);
 
                /*
                 * Store device at the device cache, in order to call
@@ -313,6 +314,7 @@ EXPORT_SYMBOL(v4l2_async_register_subdev);
 void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
 {
        struct v4l2_async_notifier *notifier = sd->notifier;
+       struct v4l2_async_subdev *asd = sd->asd;
 
        if (!sd->asd) {
                if (!list_empty(&sd->async_list))
@@ -327,7 +329,7 @@ void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
        v4l2_async_cleanup(sd);
 
        if (notifier->unbind)
-               notifier->unbind(notifier, sd, sd->asd);
+               notifier->unbind(notifier, sd, asd);
 
        mutex_unlock(&list_lock);
 }
-- 
2.8.2

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