* [PATCH] drm/exynos: fix a timeout loop
@ 2017-01-20 16:54 ` Tobias Jakobi
2017-01-23 9:32 ` Inki Dae
0 siblings, 1 reply; 8+ messages in thread
From: Tobias Jakobi @ 2017-01-20 16:54 UTC (permalink / raw)
To: linux-samsung-soc; +Cc: Dan Carpenter, dri-devel
From: Dan Carpenter <dan.carpenter@oracle.com>
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>
Reviewed-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
---
drivers/gpu/drm/exynos/exynos_mixer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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;
--
2.7.3
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^ permalink raw reply related [flat|nested] 8+ messages in thread* Re: [PATCH] drm/exynos: fix a timeout loop
2017-01-20 16:54 ` [PATCH] drm/exynos: fix a timeout loop Tobias Jakobi
@ 2017-01-23 9:32 ` Inki Dae
2017-01-23 9:41 ` Chris Wilson
0 siblings, 1 reply; 8+ messages in thread
From: Inki Dae @ 2017-01-23 9:32 UTC (permalink / raw)
To: Tobias Jakobi, linux-samsung-soc; +Cc: Dan Carpenter, dri-devel
2017년 01월 21일 01:54에 Tobias Jakobi 이(가) 쓴 글:
> From: Dan Carpenter <dan.carpenter@oracle.com>
>
> 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.
Sorry but I already know this patch from long ago but I'm not clear yet.
How the variable, tries, could have UNIT_MAX?
Seems something I'm missing.
Thanks.
>
> 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>
> Reviewed-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
> ---
> drivers/gpu/drm/exynos/exynos_mixer.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> 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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^ permalink raw reply [flat|nested] 8+ messages in thread* Re: [PATCH] drm/exynos: fix a timeout loop
2017-01-23 9:32 ` Inki Dae
@ 2017-01-23 9:41 ` Chris Wilson
2017-01-24 0:07 ` Inki Dae
0 siblings, 1 reply; 8+ messages in thread
From: Chris Wilson @ 2017-01-23 9:41 UTC (permalink / raw)
To: Inki Dae; +Cc: Tobias Jakobi, linux-samsung-soc, dri-devel, Dan Carpenter
On Mon, Jan 23, 2017 at 06:32:16PM +0900, Inki Dae wrote:
>
>
> 2017년 01월 21일 01:54에 Tobias Jakobi 이(가) 쓴 글:
> > From: Dan Carpenter <dan.carpenter@oracle.com>
> >
> > 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.
>
> Sorry but I already know this patch from long ago but I'm not clear yet.
> How the variable, tries, could have UNIT_MAX?
The value of tries after the final loop is -1u. The WARN fires on a
succesful read on the final loop, instead of the complete failure.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] drm/exynos: fix a timeout loop
2017-01-23 9:41 ` Chris Wilson
@ 2017-01-24 0:07 ` Inki Dae
0 siblings, 0 replies; 8+ messages in thread
From: Inki Dae @ 2017-01-24 0:07 UTC (permalink / raw)
To: Chris Wilson, Tobias Jakobi, linux-samsung-soc, Dan Carpenter, dri-devel
2017년 01월 23일 18:41에 Chris Wilson 이(가) 쓴 글:
> On Mon, Jan 23, 2017 at 06:32:16PM +0900, Inki Dae wrote:
>>
>>
>> 2017년 01월 21일 01:54에 Tobias Jakobi 이(가) 쓴 글:
>>> From: Dan Carpenter <dan.carpenter@oracle.com>
>>>
>>> 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.
>>
>> Sorry but I already know this patch from long ago but I'm not clear yet.
>> How the variable, tries, could have UNIT_MAX?
>
> The value of tries after the final loop is -1u. The WARN fires on a
> succesful read on the final loop, instead of the complete failure.
Ah, right. thanks.
> -Chris
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* [patch] drm/exynos: fix a timeout loop
@ 2016-10-13 10:20 ` Dan Carpenter
0 siblings, 0 replies; 8+ messages in thread
From: Dan Carpenter @ 2016-10-13 10:20 UTC (permalink / raw)
To: Inki Dae, Tobias Jakobi
Cc: linux-samsung-soc, kernel-janitors, Seung-Woo Kim,
Krzysztof Kozlowski, Javier Martinez Canillas, Kyungmin Park,
Kukjin Kim, dri-devel
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;
^ permalink raw reply related [flat|nested] 8+ messages in thread* [patch] drm/exynos: fix a timeout loop
@ 2016-10-13 10:20 ` Dan Carpenter
0 siblings, 0 replies; 8+ messages in thread
From: Dan Carpenter @ 2016-10-13 10:20 UTC (permalink / raw)
To: Inki Dae, Tobias Jakobi
Cc: linux-samsung-soc, kernel-janitors, Seung-Woo Kim,
Krzysztof Kozlowski, Javier Martinez Canillas, Kyungmin Park,
Kukjin Kim, dri-devel
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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^ permalink raw reply related [flat|nested] 8+ messages in thread* Re: [patch] drm/exynos: fix a timeout loop
2016-10-13 10:20 ` Dan Carpenter
@ 2016-10-13 11:05 ` Tobias Jakobi
-1 siblings, 0 replies; 8+ messages in thread
From: Tobias Jakobi @ 2016-10-13 11:05 UTC (permalink / raw)
To: Dan Carpenter, Inki Dae, Tobias Jakobi
Cc: linux-samsung-soc, kernel-janitors, Seung-Woo Kim,
Krzysztof Kozlowski, Javier Martinez Canillas, Kyungmin Park,
Kukjin Kim, dri-devel
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;
> --
> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
^ permalink raw reply [flat|nested] 8+ messages in thread* Re: [patch] drm/exynos: fix a timeout loop
@ 2016-10-13 11:05 ` Tobias Jakobi
0 siblings, 0 replies; 8+ messages in thread
From: Tobias Jakobi @ 2016-10-13 11:05 UTC (permalink / raw)
To: Dan Carpenter, Inki Dae, Tobias Jakobi
Cc: linux-samsung-soc, kernel-janitors, Seung-Woo Kim,
Krzysztof Kozlowski, Javier Martinez Canillas, Kyungmin Park,
Kukjin Kim, dri-devel
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;
> --
> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
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^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2017-01-24 1:17 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
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2017-01-20 16:54 ` [PATCH] drm/exynos: fix a timeout loop Tobias Jakobi
2017-01-23 9:32 ` Inki Dae
2017-01-23 9:41 ` Chris Wilson
2017-01-24 0:07 ` Inki Dae
2016-10-13 10:20 [patch] " Dan Carpenter
2016-10-13 10:20 ` Dan Carpenter
2016-10-13 11:05 ` Tobias Jakobi
2016-10-13 11:05 ` Tobias Jakobi
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