[PATCH 5.14 390/849] media: sun6i-csi: Allow the video device to be open multiple times

Greg Kroah-Hartman
2021-11-16T01:37:31Z

From: Ondrej Jirman <megous@megous.com>

[ Upstream commit 8ed852834683ebe064157e069af8dfb41cad6403 ]

Previously it was possible, but a recent fix for uninitialized
`ret` variable broke this behavior.

v4l2_fh_is_singular_file() check is there just to determine
whether the power needs to be enabled, and it's not a failure
if it returns false.

Fixes: ba9139116bc0 ("media: sun6i-csi: add a missing return code")
Signed-off-by: Ondrej Jirman <megous@megous.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
index 07b2161392d21..5ba3e29f794fd 100644
--- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
+++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
@@ -467,7 +467,7 @@ static const struct v4l2_ioctl_ops sun6i_video_ioctl_ops = {
static int sun6i_video_open(struct file *file)
{
struct sun6i_video *video = video_drvdata(file);
- int ret;
+ int ret = 0;

if (mutex_lock_interruptible(&video->lock))
return -ERESTARTSYS;
@@ -481,10 +481,8 @@ static int sun6i_video_open(struct file *file)
goto fh_release;

/* check if already powered */
- if (!v4l2_fh_is_singular_file(file)) {
- ret = -EBUSY;
+ if (!v4l2_fh_is_singular_file(file))
goto unlock;
- }

ret = sun6i_csi_set_power(video->csi, true);
if (ret < 0)
--
2.33.0