linux-kernel - Re: [PATCH] spi: omap2-mcspi: add runtime PM to set

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Date:	Fri, 24 Jul 2015 17:39:46 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Sebastian Reichel <sre@...nel.org>
Cc:	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, Michael Welling <mwelling@...e.org>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH] spi: omap2-mcspi: add runtime PM to set_cs()

On Wed, Jul 22, 2015 at 08:46:09PM +0200, Sebastian Reichel wrote:
> Since commit ddcad7e9068eb omap2_mcspi_set_cs() is called without
> runtime power management requested. Thus the below kernel oops may be
> generated if a device is accessed after the runtime power management
> timeout. This patch fixes the problem by requesting runtime power
> management in omap2_mcspi_set_cs().
> 
> [   13.933959] Unhandled fault: external abort on non-linefetch (0x1028) at 0xfa09802c
> [   13.940490] pgd = cfb38000
> [   13.946594] [fa09802c] *pgd=48011452(bad)
> [   13.952758] Internal error: : 1028 [#1] PREEMPT ARM
> [   13.958862] Modules linked in: tsc2005(+) omap_sham twl4030_wdt omap_wdt
> [   13.965332] CPU: 0 PID: 183 Comm: modprobe Not tainted 4.2.0-rc1+ #363
> [   13.971801] Hardware name: Nokia RX-51 board
> [   13.978302] task: cf572300 ti: cb1f2000 task.ti: cb1f2000
> [   13.984924] PC is at omap2_mcspi_set_cs+0x44/0x4c
> [   13.991485] LR is at spi_set_cs+0x5c/0x60

Please don't paste entire backtraces into commit messages, they are very
large and almost entirely noise (for example in this case the entire
explanation is in the commit message itself).  If you feel a backtrace
helps clarify things then please present an *edited* highlight of the
relevant sections.
present

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