linux-kernel - Re: [PATCH] mfd: kempld-core: Fix potential hang-up during boot

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Message-ID: <20140320154941.GF8207@lee--X1>
Date:	Thu, 20 Mar 2014 15:49:41 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-kernel@...r.kernel.org, Samuel Ortiz <sameo@...ux.intel.com>,
	Michael Brunner <michael.brunner@...tron.com>
Subject: Re: [PATCH] mfd: kempld-core: Fix potential hang-up during boot

> > > On PXT and COMe-cPC2 boards it is observed that the hardware
> > > mutex is acquired but not being released during initialization.
> > > This can result in a hang-up during boot if the driver is built
> > > into the kernel.
> > > 
> > > Releasing the mutex twice if it was acquired fixes the problem.
> > > Subsequent request/release cycles work as expected, so the fix is
> > > only needed during initialization.
> > > 
> > > Reviewed-by: Michael Brunner <michael.brunner@...tron.com>
> > > Tested-by: Michael Brunner <michael.brunner@...tron.com>
> > > Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> > > ---
> > >  drivers/mfd/kempld-core.c |    7 +++++--
> > >  1 file changed, 5 insertions(+), 2 deletions(-)
> > 
> > I was going to stop taking patches for this cycle, but as this looks
> > like a bugfix I'll apply it, thanks.
> > 
> 
> Hi Lee,
> 
> Great.
> 
> I should have added a note - the patch will also be needed in -stable;
> the driver is used in both 3.12 and 3.13.

Very well. I'll add the Cc to the commit log.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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