From mboxrd@z Thu Jan  1 00:00:00 1970
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
Date: Tue, 6 Mar 2012 10:40:15 +0000
Subject: [PATCH 15/20] ASoC: fsl: make fsl_ssi driver compilable on ARM/IMX
In-Reply-To: <20120305002635.GA23798@opensource.wolfsonmicro.com>
References: <1330788001-10158-1-git-send-email-shawn.guo@linaro.org>
 <1330788001-10158-16-git-send-email-shawn.guo@linaro.org>
 <4F53F704.8080703@freescale.com>
 <20120304232817.GA13516@n2100.arm.linux.org.uk>
 <4F53FBA1.8090200@freescale.com>
 <20120305000411.GL7363@n2100.arm.linux.org.uk>
 <4F54053F.9070502@freescale.com>
 <20120305002635.GA23798@opensource.wolfsonmicro.com>
Message-ID: <20120306104015.GF17370@n2100.arm.linux.org.uk>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Mon, Mar 05, 2012 at 12:26:36AM +0000, Mark Brown wrote:
> On Mon, Mar 05, 2012 at 12:13:52AM +0000, Tabi Timur-B04825 wrote:
> 
> > To answer your question: I was lead to believe that the individual ALSA 
> > callback functions are atomic.  So one thread should not be trying to 
> > start playback while another thread is simultaneously trying to stop it.
> 
> That's correct, there's ALSA level locking.

Please explain which lock prevents the capture substream trigger callback
occuring simultaneously with a playback substream trigger callback on a
SMP system.

Thanks.