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

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Message-ID: <20140320153634.GB18690@roeck-us.net>
Date:	Thu, 20 Mar 2014 08:36:34 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Lee Jones <lee.jones@...aro.org>
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 Thu, Mar 20, 2014 at 03:28:12PM +0000, Lee Jones wrote:
> > 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.

Thanks,
Guenter
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