From: Mauro Carvalho Chehab mchehab+samsung@kernel.org
[ Upstream commit 31b8b0bd6e55c3ea5a08bb8141fa5d3c90600e3b ]
While this might not occur in practice, if the device is doing the right thing, it would be teoretically be possible to have both hsync_counter and vsync_counter negatives.
If this ever happen, ctrl will be undefined, but the driver will still call:
aspeed_video_update(video, VE_CTRL, 0, ctrl);
Change the code to prevent this to happen.
This was warned by cppcheck:
[drivers/media/platform/aspeed-video.c:653]: (error) Uninitialized variable: ctrl
Reviewed-by: Eddie James eajames@linux.ibm.com Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/media/platform/aspeed-video.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c index de0f192afa8b1..388c32a11345d 100644 --- a/drivers/media/platform/aspeed-video.c +++ b/drivers/media/platform/aspeed-video.c @@ -632,7 +632,7 @@ static void aspeed_video_check_and_set_polarity(struct aspeed_video *video) }
if (hsync_counter < 0 || vsync_counter < 0) { - u32 ctrl; + u32 ctrl = 0;
if (hsync_counter < 0) { ctrl = VE_CTRL_HSYNC_POL; @@ -652,7 +652,8 @@ static void aspeed_video_check_and_set_polarity(struct aspeed_video *video) V4L2_DV_VSYNC_POS_POL; }
- aspeed_video_update(video, VE_CTRL, 0, ctrl); + if (ctrl) + aspeed_video_update(video, VE_CTRL, 0, ctrl); } }