linux-kernel - Re: [PATCH] spi: slink-tegra20: move runtime pm calls to transfer_one

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Date:	Fri, 08 Mar 2013 10:05:28 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
CC:	grant.likely@...retlab.ca, broonie@...nsource.wolfsonmicro.com,
	spi-devel-general@...ts.sourceforge.net,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi: slink-tegra20: move runtime pm calls to transfer_one_message

On 03/07/2013 11:21 PM, Laxman Dewangan wrote:
> The prepare_transfer_hardware() is called in atomic context and
> calling synchronous runtime pm calls can create scheduling deadlock.
> 
> Therefore, in place of calling runtime PM calls from prepare/unprepare
> message transfer, calling this in transfer_one_message().

Tested-by: Stephen Warren <swarren@...dia.com>

This does fix some slightly intermittent lockups/crashes for me when
erasing and re-writing the SPI flash on Cardhu.
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