linux-kernel - Re: [PATCH 4/4] ALSA: pcm_dmaengine: Properly synchronize DMA on shutdown

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Date:	Tue, 20 Oct 2015 15:01:27 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Takashi Iwai <tiwai@...e.de>
CC:	Vinod Koul <vinod.koul@...el.com>, alsa-devel@...a-project.org,
	Russell King <rmk+kernel@....linux.org.uk>,
	Shengjiu Wang <shengjiu.wang@...escale.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Jonah Petri <jpetri@...tope.com>,
	Matt Campbell <mcampbell@...tope.com>,
	Qiao Zhou <zhouqiao@...vell.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] ALSA: pcm_dmaengine: Properly synchronize DMA on
 shutdown

[...]
> I've tested this series with xrun injection and some modifications to the
> DMA driver to always trigger the race condition when the stream is stopped.
> And I've not seen any issues after the transfer re-started. (There is a
> dead-lock condition though but that does not seem to be related to this series)

Turns out that was a bug in the DMA driver that caused
snd_pcm_period_elapsed() to be called on the TRIGGER_START path. So the ALSA
side seems to be good.

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