[PATCH] ASoC: acpi: fix: continue searching when machine is ignored

[PATCH] ASoC: acpi: fix: continue searching when machine is ignored

[Keyon Jie]

The machine_quirk may return NULL which means the acpi entries should be
skipped and search for next matched entry is needed, here add return
check here and continue for NULL case.

Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
---
 sound/soc/soc-acpi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/soc/soc-acpi.c b/sound/soc/soc-acpi.c
index b8e72b52db30..faf8941363e4 100644
--- a/sound/soc/soc-acpi.c
+++ b/sound/soc/soc-acpi.c
@@ -15,7 +15,10 @@ snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
 		if (acpi_dev_present(mach->id, NULL, -1)) {
 			if (mach->machine_quirk)
 				mach = mach->machine_quirk(mach);
-			return mach;
+
+			/* return matched machine, continue otherwise */
+			if (mach)
+				return mach;
 		}
 	}
 	return NULL;
-- 
2.17.1

Re: [PATCH] ASoC: acpi: fix: continue searching when machine is ignored

[Pierre-Louis Bossart]

On 10/31/18 9:36 PM, Keyon Jie wrote:
> The machine_quirk may return NULL which means the acpi entries should be
> skipped and search for next matched entry is needed, here add return
> check here and continue for NULL case.

Nice catch, this was missed in the other patchset since the ACPI ID to 
ignore was the last in the table...

Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>

>
> Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
> ---
>   sound/soc/soc-acpi.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/sound/soc/soc-acpi.c b/sound/soc/soc-acpi.c
> index b8e72b52db30..faf8941363e4 100644
> --- a/sound/soc/soc-acpi.c
> +++ b/sound/soc/soc-acpi.c
> @@ -15,7 +15,10 @@ snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
>   		if (acpi_dev_present(mach->id, NULL, -1)) {
>   			if (mach->machine_quirk)
>   				mach = mach->machine_quirk(mach);
> -			return mach;
> +
> +			/* return matched machine, continue otherwise */
> +			if (mach)
> +				return mach;
>   		}
>   	}
>   	return NULL;

Re: [PATCH] ASoC: acpi: fix: continue searching when machine is ignored

[Pierre-Louis Bossart]

Hi Keyon,

>> The machine_quirk may return NULL which means the acpi entries should be
>> skipped and search for next matched entry is needed, here add return
>> check here and continue for NULL case.
>
> Nice catch, this was missed in the other patchset since the ACPI ID to 
> ignore was the last in the table...
>
> Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>

I was wondering if this patch was merged, but actually it's good Mark 
wasn't copied on this one: the code doesn't quite work as intended and 
shouldn't be merged as is.

Chintan and I see an oops and reboot on KBL Chromebooks, when the quirk 
returns NULL, the mach variable becomes NULL and cannot be modified with 
pointer arithmetic (which doesn't show with the diff format).

It's very likely btw that anyone trying a recent kernel on these devices 
would not see the audio driver probe at all, so we do want to try other 
entries - but of course without this nasty side effect. I will submit a 
v2 when I've sorted out other problems on Chrome.

Thanks

-Pierre

>
>>
>> Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
>> ---
>>   sound/soc/soc-acpi.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/sound/soc/soc-acpi.c b/sound/soc/soc-acpi.c
>> index b8e72b52db30..faf8941363e4 100644
>> --- a/sound/soc/soc-acpi.c
>> +++ b/sound/soc/soc-acpi.c
>> @@ -15,7 +15,10 @@ snd_soc_acpi_find_machine(struct snd_soc_acpi_mach 
>> *machines)
>>           if (acpi_dev_present(mach->id, NULL, -1)) {
>>               if (mach->machine_quirk)
>>                   mach = mach->machine_quirk(mach);
>> -            return mach;
>> +
>> +            /* return matched machine, continue otherwise */
>> +            if (mach)
>> +                return mach;
>>           }
>>       }
>>       return NULL;
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Re: [PATCH] ASoC: acpi: fix: continue searching when machine is ignored

[Keyon Jie]

On 2018/11/16 上午7:01, Pierre-Louis Bossart wrote:
> Hi Keyon,
> 
>>> The machine_quirk may return NULL which means the acpi entries should be
>>> skipped and search for next matched entry is needed, here add return
>>> check here and continue for NULL case.
>>
>> Nice catch, this was missed in the other patchset since the ACPI ID to 
>> ignore was the last in the table...
>>
>> Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
> 
> I was wondering if this patch was merged, but actually it's good Mark 
> wasn't copied on this one: the code doesn't quite work as intended and 
> shouldn't be merged as is.
> 
> Chintan and I see an oops and reboot on KBL Chromebooks, when the quirk 
> returns NULL, the mach variable becomes NULL and cannot be modified with 
> pointer arithmetic (which doesn't show with the diff format).

Ah, yeap, I omitted this, so we may need introduce a new pointer to fix 
that, something like this:

diff --git a/sound/soc/soc-acpi.c b/sound/soc/soc-acpi.c
index b8e72b52db30..0d967d0ca222 100644
--- a/sound/soc/soc-acpi.c
+++ b/sound/soc/soc-acpi.c
@@ -10,11 +10,22 @@ struct snd_soc_acpi_mach *
  snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
  {
         struct snd_soc_acpi_mach *mach;
+       struct snd_soc_acpi_mach *quirk_mach = NULL;

         for (mach = machines; mach->id[0]; mach++) {
                 if (acpi_dev_present(mach->id, NULL, -1)) {
-                       if (mach->machine_quirk)
-                               mach = mach->machine_quirk(mach);
+                       if (mach->machine_quirk) {
+                               quirk_mach = mach->machine_quirk(mach);
+
+                               if (!quirk_mach)
+                                       /* skip if no quirk matched */
+                                       continue;
+                               else
+                                       /* return quirk matched machine */
+                                       return quirk_mach;
+                       }
+
+                       /* return acpi matched machine directly */
                         return mach;
                 }
         }


> 
> It's very likely btw that anyone trying a recent kernel on these devices 
> would not see the audio driver probe at all, so we do want to try other 
> entries - but of course without this nasty side effect. I will submit a 
> v2 when I've sorted out other problems on Chrome.

That's fine.

Thanks,
~Keyon

> 
> Thanks
> 
> -Pierre
> 
>>
>>>
>>> Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
>>> ---
>>>   sound/soc/soc-acpi.c | 5 ++++-
>>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/sound/soc/soc-acpi.c b/sound/soc/soc-acpi.c
>>> index b8e72b52db30..faf8941363e4 100644
>>> --- a/sound/soc/soc-acpi.c
>>> +++ b/sound/soc/soc-acpi.c
>>> @@ -15,7 +15,10 @@ snd_soc_acpi_find_machine(struct snd_soc_acpi_mach 
>>> *machines)
>>>           if (acpi_dev_present(mach->id, NULL, -1)) {
>>>               if (mach->machine_quirk)
>>>                   mach = mach->machine_quirk(mach);
>>> -            return mach;
>>> +
>>> +            /* return matched machine, continue otherwise */
>>> +            if (mach)
>>> +                return mach;
>>>           }
>>>       }
>>>       return NULL;
>> _______________________________________________
>> Alsa-devel mailing list
>> Alsa-devel@alsa-project.org
>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> _______________________________________________
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> Alsa-devel@alsa-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
_______________________________________________
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Re: [PATCH] ASoC: acpi: fix: continue searching when machine is ignored

[Pierre-Louis Bossart]

On 11/15/18 9:03 PM, Keyon Jie wrote:
>
>
> On 2018/11/16 上午7:01, Pierre-Louis Bossart wrote:
>> Hi Keyon,
>>
>>>> The machine_quirk may return NULL which means the acpi entries 
>>>> should be
>>>> skipped and search for next matched entry is needed, here add return
>>>> check here and continue for NULL case.
>>>
>>> Nice catch, this was missed in the other patchset since the ACPI ID 
>>> to ignore was the last in the table...
>>>
>>> Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
>>
>> I was wondering if this patch was merged, but actually it's good Mark 
>> wasn't copied on this one: the code doesn't quite work as intended 
>> and shouldn't be merged as is.
>>
>> Chintan and I see an oops and reboot on KBL Chromebooks, when the 
>> quirk returns NULL, the mach variable becomes NULL and cannot be 
>> modified with pointer arithmetic (which doesn't show with the diff 
>> format).
>
> Ah, yeap, I omitted this, so we may need introduce a new pointer to 
> fix that, something like this:
>
> diff --git a/sound/soc/soc-acpi.c b/sound/soc/soc-acpi.c
> index b8e72b52db30..0d967d0ca222 100644
> --- a/sound/soc/soc-acpi.c
> +++ b/sound/soc/soc-acpi.c
> @@ -10,11 +10,22 @@ struct snd_soc_acpi_mach *
>  snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
>  {
>         struct snd_soc_acpi_mach *mach;
> +       struct snd_soc_acpi_mach *quirk_mach = NULL;
>
>         for (mach = machines; mach->id[0]; mach++) {
>                 if (acpi_dev_present(mach->id, NULL, -1)) {
> -                       if (mach->machine_quirk)
> -                               mach = mach->machine_quirk(mach);
> +                       if (mach->machine_quirk) {
> +                               quirk_mach = mach->machine_quirk(mach);
> +
> +                               if (!quirk_mach)
> +                                       /* skip if no quirk matched */
> +                                       continue;
> +                               else
> +                                       /* return quirk matched 
> machine */
> +                                       return quirk_mach;
> +                       }
> +
> +                       /* return acpi matched machine directly */

Yes, we tried something similar, see 
https://github.com/plbossart/sound/commit/9acfd674141bfc0a0bdadda1c3f7b16cc61047de


> return mach;
>                 }
>         }
>
>
>>
>> It's very likely btw that anyone trying a recent kernel on these 
>> devices would not see the audio driver probe at all, so we do want to 
>> try other entries - but of course without this nasty side effect. I 
>> will submit a v2 when I've sorted out other problems on Chrome.
>
> That's fine.
>
> Thanks,
> ~Keyon
>
>>
>> Thanks
>>
>> -Pierre
>>
>>>
>>>>
>>>> Signed-off-by: Keyon Jie <yang.jie@linux.intel.com>
>>>> ---
>>>>   sound/soc/soc-acpi.c | 5 ++++-
>>>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/sound/soc/soc-acpi.c b/sound/soc/soc-acpi.c
>>>> index b8e72b52db30..faf8941363e4 100644
>>>> --- a/sound/soc/soc-acpi.c
>>>> +++ b/sound/soc/soc-acpi.c
>>>> @@ -15,7 +15,10 @@ snd_soc_acpi_find_machine(struct 
>>>> snd_soc_acpi_mach *machines)
>>>>           if (acpi_dev_present(mach->id, NULL, -1)) {
>>>>               if (mach->machine_quirk)
>>>>                   mach = mach->machine_quirk(mach);
>>>> -            return mach;
>>>> +
>>>> +            /* return matched machine, continue otherwise */
>>>> +            if (mach)
>>>> +                return mach;
>>>>           }
>>>>       }
>>>>       return NULL;
>>> _______________________________________________
>>> Alsa-devel mailing list
>>> Alsa-devel@alsa-project.org
>>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>> _______________________________________________
>> Alsa-devel mailing list
>> Alsa-devel@alsa-project.org
>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
_______________________________________________
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