Shuah Khan wrote:> On 09/01/2015 02:42 AM, Clemens Ladisch wrote: >> Shuah Khan wrote: >>> +++ b/sound/usb/stream.c >>> pcm->private_data = as; >>> pcm->private_free = snd_usb_audio_pcm_free; >>> pcm->info_flags = 0; >>> + pcm->nonatomic = true; >> >> Why do you think you need nonatomic mode in the USB audio driver? > > I have been working on adding Media Controller support for this chip > as chip specific feature in ALSA. This will allow sharing resources > such as the tuner across the drivers that control the device (DVB, > Video, snd-usb-audio). Media Controller framework uses a mutex to > protect access to resources, hence there is a need to hold this mutex > from SNDRV_PCM_TRIGGER_START and SNDRV_PCM_TRIGGER_STOP which could run > in IRQ context. Resources should be managed in the hw_params/hw_free callbacks. Regards, Clemens -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
