From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lars-Peter Clausen <lars@metafoo.de>
Subject: Re: [PATCH 4/4] ALSA: pcm_dmaengine: Properly synchronize DMA on
 shutdown
Date: Tue, 20 Oct 2015 15:01:27 +0200
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To: Takashi Iwai <tiwai@suse.de>
Cc: Vinod Koul <vinod.koul@intel.com>, alsa-devel@alsa-project.org, Russell King <rmk+kernel@arm.linux.org.uk>, Shengjiu Wang <shengjiu.wang@freescale.com>, Dan Williams <dan.j.williams@intel.com>, Jonah Petri <jpetri@izotope.com>, Matt Campbell <mcampbell@izotope.com>, Qiao Zhou <zhouqiao@marvell.com>, Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org
List-Id: alsa-devel@alsa-project.org

[...]
> 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.