linux-kernel - [PATCH AUTOSEL 3.18 15/29] media: s3c-camif: ignore -ENOIOCTLCMD from v4l2_subdev_call for s

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Message-ID: <20180917030533.592-15-alexander.levin@microsoft.com>
Date:   Mon, 17 Sep 2018 03:05:46 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Akinobu Mita <akinobu.mita@...il.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 3.18 15/29] media: s3c-camif: ignore -ENOIOCTLCMD from
 v4l2_subdev_call for s_power

From: Akinobu Mita <akinobu.mita@...il.com>

[ Upstream commit 30ed2b83343bd1e07884ca7355dac70d25ffc158 ]

When the subdevice doesn't provide s_power core ops callback, the
v4l2_subdev_call for s_power returns -ENOIOCTLCMD.  If the subdevice
doesn't have the special handling for its power saving mode, the s_power
isn't required.  So -ENOIOCTLCMD from the v4l2_subdev_call should be
ignored.

Cc: Hans Verkuil <hans.verkuil@...co.com>
Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Acked-by: Sylwester Nawrocki <sylvester.nawrocki@...il.com>
Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/media/platform/s3c-camif/camif-capture.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/platform/s3c-camif/camif-capture.c b/drivers/media/platform/s3c-camif/camif-capture.c
index 97a52d4574e7..bb4a57e55aed 100644
--- a/drivers/media/platform/s3c-camif/camif-capture.c
+++ b/drivers/media/platform/s3c-camif/camif-capture.c
@@ -117,6 +117,8 @@ static int sensor_set_power(struct camif_dev *camif, int on)
 
 	if (camif->sensor.power_count == !on)
 		err = v4l2_subdev_call(sensor->sd, core, s_power, on);
+	if (err == -ENOIOCTLCMD)
+		err = 0;
 	if (!err)
 		sensor->power_count += on ? 1 : -1;
 
-- 
2.17.1