[patch] drm/exynos: fix a timeout loop

[patch] drm/exynos: fix a timeout loop

[Dan Carpenter]

We were trying to print an error message if we timed out here, but the
loop actually ends with "tries" set to UINT_MAX and not zero.  Fix this
by changing from tries-- to --tries.

A for loop would actually be the most natural way to do this.  My fix
means we only loop 99 times instead of 100 but that's probably ok.

Fixes: a696394c5224 ('drm/exynos: mixer: simplify loop in vp_win_reset()')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index edb20a3..fcc7e4f 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -701,7 +701,7 @@ static void vp_win_reset(struct mixer_context *ctx)
 	unsigned int tries = 100;
 
 	vp_reg_write(res, VP_SRESET, VP_SRESET_PROCESSING);
-	while (tries--) {
+	while (--tries) {
 		/* waiting until VP_SRESET_PROCESSING is 0 */
 		if (~vp_reg_read(res, VP_SRESET) & VP_SRESET_PROCESSING)
 			break;

Re: [patch] drm/exynos: fix a timeout loop

[Tobias Jakobi]

Hello Dan,

sorry for the blunder! Patch looks good to me.

Reviewed-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>


With best wishes,
Tobias


Dan Carpenter wrote:
> We were trying to print an error message if we timed out here, but the
> loop actually ends with "tries" set to UINT_MAX and not zero.  Fix this
> by changing from tries-- to --tries.
> 
> A for loop would actually be the most natural way to do this.  My fix
> means we only loop 99 times instead of 100 but that's probably ok.
> 
> Fixes: a696394c5224 ('drm/exynos: mixer: simplify loop in vp_win_reset()')
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
> index edb20a3..fcc7e4f 100644
> --- a/drivers/gpu/drm/exynos/exynos_mixer.c
> +++ b/drivers/gpu/drm/exynos/exynos_mixer.c
> @@ -701,7 +701,7 @@ static void vp_win_reset(struct mixer_context *ctx)
>  	unsigned int tries = 100;
>  
>  	vp_reg_write(res, VP_SRESET, VP_SRESET_PROCESSING);
> -	while (tries--) {
> +	while (--tries) {
>  		/* waiting until VP_SRESET_PROCESSING is 0 */
>  		if (~vp_reg_read(res, VP_SRESET) & VP_SRESET_PROCESSING)
>  			break;
> --
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