[PATCH 3/7] media: aspeed-video: address a protential usage of an unit var
Eddie James
eajames at linux.vnet.ibm.com
Tue Aug 27 01:12:47 AEST 2019
On 8/22/19 2:39 PM, Mauro Carvalho Chehab wrote:
> 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
Thanks Mauro.
Reviewed-by: Eddie James <eajames at linux.ibm.com>
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung at 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 f899ac3b4a61..4ef37cfc8446 100644
> --- a/drivers/media/platform/aspeed-video.c
> +++ b/drivers/media/platform/aspeed-video.c
> @@ -630,7 +630,7 @@ 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;
> @@ -650,7 +650,8 @@ 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);
> }
> }
>
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