linux-kernel - Re: [PATCH v2 1/2] ALSA: usb-audio: Fix irq/process data synchronization

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Date:   Wed, 04 Jan 2017 07:28:28 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     "Ioan-Adrian Ratiu" <adi@...rat.com>
Cc:     <perex@...ex.cz>, <o-takashi@...amocchi.jp>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] ALSA: usb-audio: Fix irq/process data synchronization

On Mon, 02 Jan 2017 16:50:30 +0100,
Ioan-Adrian Ratiu wrote:
> 
> --- a/sound/usb/pcm.c
> +++ b/sound/usb/pcm.c
(snip)
> @@ -850,7 +850,7 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
>  	/* for playback, submit the URBs now; otherwise, the first hwptr_done
>  	 * updates for all URBs would happen at the same time when starting */
>  	if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
> -		ret = start_endpoints(subs, true);
> +		return start_endpoints(subs);

Here you miss the unlock below.

>  
>   unlock:
>  	snd_usb_unlock_shutdown(subs->stream->chip);

... and this must be the reason of the hang up at disconnection, where
the driver ways forever at wait_event() in usb_audio_disconnect().

Could you fix this and resubmit v3?  Other than that, it looks OK.


thanks,

Takashi