[PATCH] [media] v4l2-async: Don't fail if registered_async isn't implemented

[PATCH] [media] v4l2-async: Don't fail if registered_async isn't implemented

[Javier Martinez Canillas]

After sub-dev registration in v4l2_async_test_notify(), the v4l2-async
core calls the registered_async callback but if a sub-dev driver does
not implement it, v4l2_subdev_call() will return a -ENOIOCTLCMD which
should not be considered an error.

Reported-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>

---

 drivers/media/v4l2-core/v4l2-async.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index 716bfd47daab..4d809115ba49 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -113,7 +113,7 @@ static int v4l2_async_test_notify(struct v4l2_async_notifier *notifier,
 	list_move(&sd->async_list, &notifier->done);
 
 	ret = v4l2_device_register_subdev(notifier->v4l2_dev, sd);
-	if (ret < 0) {
+	if (ret < 0 && ret != -ENOIOCTLCMD) {
 		if (notifier->unbind)
 			notifier->unbind(notifier, sd, asd);
 		return ret;
-- 
2.5.0

Re: [PATCH] [media] v4l2-async: Don't fail if registered_async isn't implemented

[Benoit Parrot]

Javier Martinez Canillas <javier@osg.samsung.com> wrote on Tue [2016-Feb-16 15:51:05 -0300]:
> After sub-dev registration in v4l2_async_test_notify(), the v4l2-async
> core calls the registered_async callback but if a sub-dev driver does
> not implement it, v4l2_subdev_call() will return a -ENOIOCTLCMD which
> should not be considered an error.
> 
> Reported-by: Benoit Parrot <bparrot@ti.com>
> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
> 
> ---
> 
>  drivers/media/v4l2-core/v4l2-async.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
> index 716bfd47daab..4d809115ba49 100644
> --- a/drivers/media/v4l2-core/v4l2-async.c
> +++ b/drivers/media/v4l2-core/v4l2-async.c
> @@ -113,7 +113,7 @@ static int v4l2_async_test_notify(struct v4l2_async_notifier *notifier,
>  	list_move(&sd->async_list, &notifier->done);
>  
>  	ret = v4l2_device_register_subdev(notifier->v4l2_dev, sd);
> -	if (ret < 0) {
> +	if (ret < 0 && ret != -ENOIOCTLCMD) {

NAK.
This fix should be on the next if block.
The one that actually invokes the registered_async call back.
As is it does not help.

Benoit

>  		if (notifier->unbind)
>  			notifier->unbind(notifier, sd, asd);
>  		return ret;
> -- 
> 2.5.0
> 

Re: [PATCH] [media] v4l2-async: Don't fail if registered_async isn't implemented

[Javier Martinez Canillas]

Hello Benoit,

On 02/16/2016 04:53 PM, Benoit Parrot wrote:
> Javier Martinez Canillas <javier@osg.samsung.com> wrote on Tue [2016-Feb-16 15:51:05 -0300]:
>> After sub-dev registration in v4l2_async_test_notify(), the v4l2-async
>> core calls the registered_async callback but if a sub-dev driver does
>> not implement it, v4l2_subdev_call() will return a -ENOIOCTLCMD which
>> should not be considered an error.
>>
>> Reported-by: Benoit Parrot <bparrot@ti.com>
>> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
>>
>> ---
>>
>>   drivers/media/v4l2-core/v4l2-async.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
>> index 716bfd47daab..4d809115ba49 100644
>> --- a/drivers/media/v4l2-core/v4l2-async.c
>> +++ b/drivers/media/v4l2-core/v4l2-async.c
>> @@ -113,7 +113,7 @@ static int v4l2_async_test_notify(struct v4l2_async_notifier *notifier,
>>   	list_move(&sd->async_list, &notifier->done);
>>
>>   	ret = v4l2_device_register_subdev(notifier->v4l2_dev, sd);
>> -	if (ret < 0) {
>> +	if (ret < 0 && ret != -ENOIOCTLCMD) {
>
> NAK.
> This fix should be on the next if block.
> The one that actually invokes the registered_async call back.

Yeah, that's actually what the commit says but I'm too stupid
to write a one line patch... I'll send a v2.

> As is it does not help.
>

Sorry about that, I shouldn't post patches in a rush.

> Benoit
>

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America