linux-kernel - Re: [PATCH 2/2] pinctrl: baytrail: Serialize all register access

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Date:	Fri, 30 Oct 2015 08:26:59 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Lucas De Marchi <lucas.de.marchi@...il.com>
Cc:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] pinctrl: baytrail: Serialize all register access

On Fri, Oct 30, 2015 at 12:48:38PM -0200, Lucas De Marchi wrote:
> Hi Mika and Linus,
> 
> CC'ing Greg.
> 
> On Tue, Aug 4, 2015 at 9:03 AM, Mika Westerberg
> <mika.westerberg@...ux.intel.com> wrote:
> > There is a hardware issue in Intel Baytrail where concurrent GPIO register
> > access might result reads of 0xffffffff and writes might get dropped
> > completely.
> >
> > Prevent this from happening by taking the serializing lock in all places
> > where it is possible that more than one thread might be accessing the
> > hardware concurrently.
> >
> > Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> > ---
> 
> Now that this is on 4.2, can we get it on stable branches?  I was
> hitting this bug for some time on MinnowBoard Max and this week I had
> some time to take a look on how to fix it. Good timing, it had already
> been fixed. Applying this patch the issue is gone on top of 4.1.12.
> 
> I'm using these patches from Linus Torvalds' tree:
> 39ce815 pinctrl: baytrail: Serialize all register access
> 78e1c89 pinctrl: baytrail: Use raw_spinlock for locking
> 
> 
> The ones to Cherryview could be sent too but I couldn't test them.
> 
> Leaving the patch below for reference.

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>
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