linux-kernel - [PATCH v2] [media] v4l2-async: Don't fail if registered

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Message-Id: <1455653001-10043-1-git-send-email-javier@osg.samsung.com>
Date:	Tue, 16 Feb 2016 17:03:21 -0300
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Benoit Parrot <bparrot@...com>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Sakari Ailus <sakari.ailus@....fi>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Bryan Wu <cooloney@...il.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-media@...r.kernel.org
Subject: [PATCH v2] [media] v4l2-async: Don't fail if registered_async isn't implemented

After sub-dev registration in v4l2_async_test_notify(), the v4l2-async
core calls the registered_async callback but if a sub-dev driver does
not implement it, v4l2_subdev_call() will return a -ENOIOCTLCMD which
should not be considered an error.

Reported-by: Benoit Parrot <bparrot@...com>
Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>

---

Changes in v2:
- Check the return of v4l2_subdev_call (Benoit).

 drivers/media/v4l2-core/v4l2-async.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index 716bfd47daab..a4b224d92572 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -120,7 +120,7 @@ static int v4l2_async_test_notify(struct v4l2_async_notifier *notifier,
 	}
 
 	ret = v4l2_subdev_call(sd, core, registered_async);
-	if (ret < 0) {
+	if (ret < 0 && ret != -ENOIOCTLCMD) {
 		if (notifier->unbind)
 			notifier->unbind(notifier, sd, asd);
 		return ret;
-- 
2.5.0