* [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
@ 2014-12-03 16:38 ` Andrew Jackson
0 siblings, 0 replies; 17+ messages in thread
From: Andrew Jackson @ 2014-12-03 16:38 UTC (permalink / raw)
To: Jaroslav Kysela, Takashi Iwai
Cc: alsa-devel@alsa-project.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Rajeev Kumar, Liam Girdwood,
Mark Brown, Liviu Dudau
Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
---
sound/soc/dwc/designware_i2s.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index 08f0229..f8946bd 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -280,7 +280,8 @@ static int dw_i2s_trigger(struct snd_pcm_substream *substream,
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- dev->active--;
+ if (dev->active > 0)
+ dev->active--;
i2s_stop(dev, substream);
break;
default:
--
1.7.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
@ 2014-12-03 16:38 ` Andrew Jackson
0 siblings, 0 replies; 17+ messages in thread
From: Andrew Jackson @ 2014-12-03 16:38 UTC (permalink / raw)
To: linux-arm-kernel
Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
---
sound/soc/dwc/designware_i2s.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index 08f0229..f8946bd 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -280,7 +280,8 @@ static int dw_i2s_trigger(struct snd_pcm_substream *substream,
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- dev->active--;
+ if (dev->active > 0)
+ dev->active--;
i2s_stop(dev, substream);
break;
default:
--
1.7.1
^ permalink raw reply related [flat|nested] 17+ messages in thread
* Re: [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
2014-12-03 16:38 ` Andrew Jackson
@ 2014-12-03 17:25 ` Mark Brown
-1 siblings, 0 replies; 17+ messages in thread
From: Mark Brown @ 2014-12-03 17:25 UTC (permalink / raw)
To: Andrew Jackson
Cc: Jaroslav Kysela, Takashi Iwai, alsa-devel@alsa-project.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Rajeev Kumar, Liam Girdwood,
Liviu Dudau
[-- Attachment #1: Type: text/plain, Size: 330 bytes --]
On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
> case SNDRV_PCM_TRIGGER_STOP:
> case SNDRV_PCM_TRIGGER_SUSPEND:
> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
> - dev->active--;
> + if (dev->active > 0)
> + dev->active--;
How is this triggering - this sounds like you're papering over some
other bug somewhere?
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^ permalink raw reply [flat|nested] 17+ messages in thread
* [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
@ 2014-12-03 17:25 ` Mark Brown
0 siblings, 0 replies; 17+ messages in thread
From: Mark Brown @ 2014-12-03 17:25 UTC (permalink / raw)
To: linux-arm-kernel
On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
> case SNDRV_PCM_TRIGGER_STOP:
> case SNDRV_PCM_TRIGGER_SUSPEND:
> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
> - dev->active--;
> + if (dev->active > 0)
> + dev->active--;
How is this triggering - this sounds like you're papering over some
other bug somewhere?
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^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
2014-12-03 17:25 ` Mark Brown
(?)
@ 2014-12-04 6:40 ` rajeev kumar
-1 siblings, 0 replies; 17+ messages in thread
From: rajeev kumar @ 2014-12-04 6:40 UTC (permalink / raw)
To: Mark Brown
Cc: alsa-devel@alsa-project.org, Liam Girdwood, Takashi Iwai,
Andrew Jackson, Liviu Dudau, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
On Wed, Dec 3, 2014 at 10:55 PM, Mark Brown <broonie@kernel.org> wrote:
> On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
>
>> case SNDRV_PCM_TRIGGER_STOP:
>> case SNDRV_PCM_TRIGGER_SUSPEND:
>> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
>> - dev->active--;
>> + if (dev->active > 0)
>> + dev->active--;
>
> How is this triggering - this sounds like you're papering over some
> other bug somewhere?
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
@ 2014-12-04 6:40 ` rajeev kumar
0 siblings, 0 replies; 17+ messages in thread
From: rajeev kumar @ 2014-12-04 6:40 UTC (permalink / raw)
To: Mark Brown
Cc: Andrew Jackson, Jaroslav Kysela, Takashi Iwai,
alsa-devel@alsa-project.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Liam Girdwood, Liviu Dudau
On Wed, Dec 3, 2014 at 10:55 PM, Mark Brown <broonie@kernel.org> wrote:
> On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
>
>> case SNDRV_PCM_TRIGGER_STOP:
>> case SNDRV_PCM_TRIGGER_SUSPEND:
>> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
>> - dev->active--;
>> + if (dev->active > 0)
>> + dev->active--;
>
> How is this triggering - this sounds like you're papering over some
> other bug somewhere?
^ permalink raw reply [flat|nested] 17+ messages in thread
* [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
@ 2014-12-04 6:40 ` rajeev kumar
0 siblings, 0 replies; 17+ messages in thread
From: rajeev kumar @ 2014-12-04 6:40 UTC (permalink / raw)
To: linux-arm-kernel
On Wed, Dec 3, 2014 at 10:55 PM, Mark Brown <broonie@kernel.org> wrote:
> On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
>
>> case SNDRV_PCM_TRIGGER_STOP:
>> case SNDRV_PCM_TRIGGER_SUSPEND:
>> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
>> - dev->active--;
>> + if (dev->active > 0)
>> + dev->active--;
>
> How is this triggering - this sounds like you're papering over some
> other bug somewhere?
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
2014-12-04 6:40 ` rajeev kumar
@ 2014-12-04 6:43 ` rajeev kumar
-1 siblings, 0 replies; 17+ messages in thread
From: rajeev kumar @ 2014-12-04 6:43 UTC (permalink / raw)
To: Mark Brown
Cc: Andrew Jackson, Jaroslav Kysela, Takashi Iwai,
alsa-devel@alsa-project.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Liam Girdwood, Liviu Dudau
On Thu, Dec 4, 2014 at 12:10 PM, rajeev kumar
<rajeevkumar.linux@gmail.com> wrote:
> On Wed, Dec 3, 2014 at 10:55 PM, Mark Brown <broonie@kernel.org> wrote:
>> On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
>>
>>> case SNDRV_PCM_TRIGGER_STOP:
>>> case SNDRV_PCM_TRIGGER_SUSPEND:
>>> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
>>> - dev->active--;
>>> + if (dev->active > 0)
>>> + dev->active--;
>>
>> How is this triggering - this sounds like you're papering over some
>> other bug somewhere?
This check can be removed as it is not going to triggered.
B'rgds
~Rajeev
^ permalink raw reply [flat|nested] 17+ messages in thread
* [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
@ 2014-12-04 6:43 ` rajeev kumar
0 siblings, 0 replies; 17+ messages in thread
From: rajeev kumar @ 2014-12-04 6:43 UTC (permalink / raw)
To: linux-arm-kernel
On Thu, Dec 4, 2014 at 12:10 PM, rajeev kumar
<rajeevkumar.linux@gmail.com> wrote:
> On Wed, Dec 3, 2014 at 10:55 PM, Mark Brown <broonie@kernel.org> wrote:
>> On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
>>
>>> case SNDRV_PCM_TRIGGER_STOP:
>>> case SNDRV_PCM_TRIGGER_SUSPEND:
>>> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
>>> - dev->active--;
>>> + if (dev->active > 0)
>>> + dev->active--;
>>
>> How is this triggering - this sounds like you're papering over some
>> other bug somewhere?
This check can be removed as it is not going to triggered.
B'rgds
~Rajeev
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
2014-12-04 6:43 ` rajeev kumar
(?)
@ 2014-12-04 9:07 ` Andrew Jackson
-1 siblings, 0 replies; 17+ messages in thread
From: Andrew Jackson @ 2014-12-04 9:07 UTC (permalink / raw)
To: rajeev kumar, Mark Brown
Cc: alsa-devel@alsa-project.org, Takashi Iwai, Liviu Dudau,
Liam Girdwood, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
On 12/04/14 06:43, rajeev kumar wrote:
> On Thu, Dec 4, 2014 at 12:10 PM, rajeev kumar
> <rajeevkumar.linux@gmail.com> wrote:
>> On Wed, Dec 3, 2014 at 10:55 PM, Mark Brown <broonie@kernel.org> wrote:
>>> On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
>>>
>>>> case SNDRV_PCM_TRIGGER_STOP:
>>>> case SNDRV_PCM_TRIGGER_SUSPEND:
>>>> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
>>>> - dev->active--;
>>>> + if (dev->active > 0)
>>>> + dev->active--;
>>>
>>> How is this triggering - this sounds like you're papering over some
>>> other bug somewhere?
>
> This check can be removed as it is not going to triggered.
As I said in my email to Mark, I couldn't convince myself that STOP/SUSPEND would only be called once so it seemed like a loophole which /might/ result in the device not functioning correctly.
If this can never happen, I'll drop the patch.
Andrew
> B'rgds
> ~Rajeev
>
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
@ 2014-12-04 9:07 ` Andrew Jackson
0 siblings, 0 replies; 17+ messages in thread
From: Andrew Jackson @ 2014-12-04 9:07 UTC (permalink / raw)
To: rajeev kumar, Mark Brown
Cc: Jaroslav Kysela, Takashi Iwai, alsa-devel@alsa-project.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Liam Girdwood, Liviu Dudau
On 12/04/14 06:43, rajeev kumar wrote:
> On Thu, Dec 4, 2014 at 12:10 PM, rajeev kumar
> <rajeevkumar.linux@gmail.com> wrote:
>> On Wed, Dec 3, 2014 at 10:55 PM, Mark Brown <broonie@kernel.org> wrote:
>>> On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
>>>
>>>> case SNDRV_PCM_TRIGGER_STOP:
>>>> case SNDRV_PCM_TRIGGER_SUSPEND:
>>>> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
>>>> - dev->active--;
>>>> + if (dev->active > 0)
>>>> + dev->active--;
>>>
>>> How is this triggering - this sounds like you're papering over some
>>> other bug somewhere?
>
> This check can be removed as it is not going to triggered.
As I said in my email to Mark, I couldn't convince myself that STOP/SUSPEND would only be called once so it seemed like a loophole which /might/ result in the device not functioning correctly.
If this can never happen, I'll drop the patch.
Andrew
> B'rgds
> ~Rajeev
>
^ permalink raw reply [flat|nested] 17+ messages in thread
* [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
@ 2014-12-04 9:07 ` Andrew Jackson
0 siblings, 0 replies; 17+ messages in thread
From: Andrew Jackson @ 2014-12-04 9:07 UTC (permalink / raw)
To: linux-arm-kernel
On 12/04/14 06:43, rajeev kumar wrote:
> On Thu, Dec 4, 2014 at 12:10 PM, rajeev kumar
> <rajeevkumar.linux@gmail.com> wrote:
>> On Wed, Dec 3, 2014 at 10:55 PM, Mark Brown <broonie@kernel.org> wrote:
>>> On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
>>>
>>>> case SNDRV_PCM_TRIGGER_STOP:
>>>> case SNDRV_PCM_TRIGGER_SUSPEND:
>>>> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
>>>> - dev->active--;
>>>> + if (dev->active > 0)
>>>> + dev->active--;
>>>
>>> How is this triggering - this sounds like you're papering over some
>>> other bug somewhere?
>
> This check can be removed as it is not going to triggered.
As I said in my email to Mark, I couldn't convince myself that STOP/SUSPEND would only be called once so it seemed like a loophole which /might/ result in the device not functioning correctly.
If this can never happen, I'll drop the patch.
Andrew
> B'rgds
> ~Rajeev
>
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
2014-12-03 17:25 ` Mark Brown
(?)
@ 2014-12-04 9:00 ` Andrew Jackson
-1 siblings, 0 replies; 17+ messages in thread
From: Andrew Jackson @ 2014-12-04 9:00 UTC (permalink / raw)
To: Mark Brown
Cc: alsa-devel@alsa-project.org, Liam Girdwood, Takashi Iwai,
Liviu Dudau, linux-kernel@vger.kernel.org, Rajeev Kumar,
linux-arm-kernel@lists.infradead.org
On 12/03/14 17:25, Mark Brown wrote:
> On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
>
>> case SNDRV_PCM_TRIGGER_STOP:
>> case SNDRV_PCM_TRIGGER_SUSPEND:
>> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
>> - dev->active--;
>> + if (dev->active > 0)
>> + dev->active--;
>
> How is this triggering - this sounds like you're papering over some
> other bug somewhere?
>
When I looked at the code paths I couldn't convince myself that STOP wouldn't be called more than once. Then actuve would be negative and the device might not be restartable. I didn't have a problem per se, it was just that it seemed to be something of a loophole.
Andrew
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
@ 2014-12-04 9:00 ` Andrew Jackson
0 siblings, 0 replies; 17+ messages in thread
From: Andrew Jackson @ 2014-12-04 9:00 UTC (permalink / raw)
To: Mark Brown
Cc: Jaroslav Kysela, Takashi Iwai, alsa-devel@alsa-project.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Rajeev Kumar, Liam Girdwood,
Liviu Dudau
On 12/03/14 17:25, Mark Brown wrote:
> On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
>
>> case SNDRV_PCM_TRIGGER_STOP:
>> case SNDRV_PCM_TRIGGER_SUSPEND:
>> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
>> - dev->active--;
>> + if (dev->active > 0)
>> + dev->active--;
>
> How is this triggering - this sounds like you're papering over some
> other bug somewhere?
>
When I looked at the code paths I couldn't convince myself that STOP wouldn't be called more than once. Then actuve would be negative and the device might not be restartable. I didn't have a problem per se, it was just that it seemed to be something of a loophole.
Andrew
^ permalink raw reply [flat|nested] 17+ messages in thread
* [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
@ 2014-12-04 9:00 ` Andrew Jackson
0 siblings, 0 replies; 17+ messages in thread
From: Andrew Jackson @ 2014-12-04 9:00 UTC (permalink / raw)
To: linux-arm-kernel
On 12/03/14 17:25, Mark Brown wrote:
> On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
>
>> case SNDRV_PCM_TRIGGER_STOP:
>> case SNDRV_PCM_TRIGGER_SUSPEND:
>> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
>> - dev->active--;
>> + if (dev->active > 0)
>> + dev->active--;
>
> How is this triggering - this sounds like you're papering over some
> other bug somewhere?
>
When I looked at the code paths I couldn't convince myself that STOP wouldn't be called more than once. Then actuve would be negative and the device might not be restartable. I didn't have a problem per se, it was just that it seemed to be something of a loophole.
Andrew
^ permalink raw reply [flat|nested] 17+ messages in thread
* Re: [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
2014-12-04 9:00 ` Andrew Jackson
@ 2014-12-04 10:51 ` Mark Brown
-1 siblings, 0 replies; 17+ messages in thread
From: Mark Brown @ 2014-12-04 10:51 UTC (permalink / raw)
To: Andrew Jackson
Cc: Jaroslav Kysela, Takashi Iwai, alsa-devel@alsa-project.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Rajeev Kumar, Liam Girdwood,
Liviu Dudau
[-- Attachment #1: Type: text/plain, Size: 1011 bytes --]
On Thu, Dec 04, 2014 at 09:00:35AM +0000, Andrew Jackson wrote:
> On 12/03/14 17:25, Mark Brown wrote:
> > On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
> >> case SNDRV_PCM_TRIGGER_STOP:
> >> case SNDRV_PCM_TRIGGER_SUSPEND:
> >> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
> >> - dev->active--;
> >> + if (dev->active > 0)
> >> + dev->active--;
> > How is this triggering - this sounds like you're papering over some
> > other bug somewhere?
> When I looked at the code paths I couldn't convince myself that STOP
> wouldn't be called more than once. Then actuve would be negative and
> the device might not be restartable. I didn't have a problem per se,
> it was just that it seemed to be something of a loophole.
If you're just adding the check on the off chance that it might fire you
need to add a warning message as well - what your change does is make
the code look like it's supposed to have broken reference counting since
it has a check to silently fix up and ignore problems.
[-- Attachment #2: Digital signature --]
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^ permalink raw reply [flat|nested] 17+ messages in thread
* [PATCH 2/5] ASoC: dwc: Don't allow negative use counts
@ 2014-12-04 10:51 ` Mark Brown
0 siblings, 0 replies; 17+ messages in thread
From: Mark Brown @ 2014-12-04 10:51 UTC (permalink / raw)
To: linux-arm-kernel
On Thu, Dec 04, 2014 at 09:00:35AM +0000, Andrew Jackson wrote:
> On 12/03/14 17:25, Mark Brown wrote:
> > On Wed, Dec 03, 2014 at 04:38:55PM +0000, Andrew Jackson wrote:
> >> case SNDRV_PCM_TRIGGER_STOP:
> >> case SNDRV_PCM_TRIGGER_SUSPEND:
> >> case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
> >> - dev->active--;
> >> + if (dev->active > 0)
> >> + dev->active--;
> > How is this triggering - this sounds like you're papering over some
> > other bug somewhere?
> When I looked at the code paths I couldn't convince myself that STOP
> wouldn't be called more than once. Then actuve would be negative and
> the device might not be restartable. I didn't have a problem per se,
> it was just that it seemed to be something of a loophole.
If you're just adding the check on the off chance that it might fire you
need to add a warning message as well - what your change does is make
the code look like it's supposed to have broken reference counting since
it has a check to silently fix up and ignore problems.
-------------- next part --------------
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^ permalink raw reply [flat|nested] 17+ messages in thread
end of thread, other threads:[~2014-12-04 10:51 UTC | newest]
Thread overview: 17+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-12-03 16:38 [PATCH 2/5] ASoC: dwc: Don't allow negative use counts Andrew Jackson
2014-12-03 16:38 ` Andrew Jackson
2014-12-03 17:25 ` Mark Brown
2014-12-03 17:25 ` Mark Brown
2014-12-04 6:40 ` rajeev kumar
2014-12-04 6:40 ` rajeev kumar
2014-12-04 6:40 ` rajeev kumar
2014-12-04 6:43 ` rajeev kumar
2014-12-04 6:43 ` rajeev kumar
2014-12-04 9:07 ` Andrew Jackson
2014-12-04 9:07 ` Andrew Jackson
2014-12-04 9:07 ` Andrew Jackson
2014-12-04 9:00 ` Andrew Jackson
2014-12-04 9:00 ` Andrew Jackson
2014-12-04 9:00 ` Andrew Jackson
2014-12-04 10:51 ` Mark Brown
2014-12-04 10:51 ` Mark Brown
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