linux-kernel - Re: [PATCH] pch_uart: Add eg20t_port lock field, avoid recursive spinlocks

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Message-ID: <20120927210440.GB3468@kroah.com>
Date:	Thu, 27 Sep 2012 14:04:40 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Darren Hart <dvhart@...ux.intel.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Stable <stable@...r.kernel.org>,
	Tomoya MORINAGA <tomoya.rohm@...il.com>,
	Feng Tang <feng.tang@...el.com>,
	Alexander Stein <alexander.stein@...tec-electronic.com>
Subject: Re: [PATCH] pch_uart: Add eg20t_port lock field, avoid recursive
 spinlocks

On Wed, Sep 05, 2012 at 05:37:25PM -0700, Darren Hart wrote:
> On 09/05/2012 05:25 PM, Darren Hart wrote:
> > 
> > 
> > On 09/05/2012 05:18 PM, Greg Kroah-Hartman wrote:
> >> On Wed, Sep 05, 2012 at 05:14:48PM -0700, Greg Kroah-Hartman wrote:
> >>> On Wed, Sep 05, 2012 at 05:04:07PM -0700, Darren Hart wrote:
> >>>> The following patch has been included in linux-next
> >>>> (fe89def79c48e2149abdd1e816523e69a9067191) but has not yet landed in mainline
> >>>> nor been queued for stable so far as I can determine. This patch addresses a
> >>>> deadlock in mainline and is a prerequisite for an additional fix required by the
> >>>> PREEMPT_RT kernel. Can we get this pulled into 3.4.11 please?
> >>>
> >>> 3.4.11?  It has to hit Linus's tree first.
> >>>
> >>>> Perhaps I am
> >>>> jumping the gun, but this patch was originally pulled on June 19, 2012.
> >>>
> >>> Remember, we missed a pull cycle for tty due to other problems, I
> >>> thought I picked all of the different pieces needed for 3.6, but I must
> >>> of missed this one.
> >>
> >> Nope, it made it, it is commit 2588aba002d14e938c2f56d299ecf3e7ce1302a5.
> > 
> > Doh, I pulled master and stable, but only checked stable. Sigh. My
> > apologies Greg.
> > 
> >>
> >> Now, do you want that patch in the -stable releases?  If so, how far
> >> back? :)
> > 
> > Yes, back to 3.0 would be ideal. It needs mangling for 3.2 and back
> > though. I will send patches for 3.4, 3.2 and possibly 3.0 following the
> > stable_kernel_rules.txt procedure.
> 
> On second thought, there are way too many changes to pch_uart that are
> required before this patch can really be applied prior to 3.4. I suspect
> these are not all appropriate for -stable. I'd be happy just getting
> this into 3.4.11. 2588aba002d14e938c2f56d299ecf3e7ce1302a5 cherry-picks
> cleanly to 3.4.

Now queued up for 3.4.y and 3.5.y, thanks.

greg k-h
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