linux-kernel - Re: + drivers-gpu-drm-i915-intel_lvdsc-fix-locking-snafu.patch added to -mm tree

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Message-ID: <alpine.DEB.2.00.0902030955420.31073@skynet.skynet.ie>
Date:	Tue, 3 Feb 2009 09:58:16 +0000 (GMT)
From:	Dave Airlie <airlied@...ux.ie>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, dri-devel@...ts.sourceforge.net
Subject: Re: + drivers-gpu-drm-i915-intel_lvdsc-fix-locking-snafu.patch added
 to -mm tree


On Mon, 2 Feb 2009, Andrew Morton wrote:

> (cc's added)
> 
> On Sat, 31 Jan 2009 16:25:08 +0100 Daniel Vetter <daniel@...ll.ch> wrote:
> 
> > On Thu, Jan 29, 2009 at 01:48:25PM -0800, Andrew Morton wrote:
> > > On Thu, 29 Jan 2009 13:24:17 -0800
> > > Jesse Barnes <jbarnes@...tuousgeek.org> wrote:
> > > > On Thursday, January 29, 2009 12:50 pm akpm@...ux-foundation.org wrote:
> 
> So I assume that it would make sense to track this as a post-2.6.28
> regression?
> 

>From ac048e1734699dd98f4bdf4daf2b9592d4a4d38e Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied@...hat.com>
Date: Tue, 3 Feb 2009 19:05:12 +1000
Subject: [PATCH] i915: fix unneeded locking in i915 LVDS get modes code.

This code is always called under the lock from the higher layers,
so need to go locking it here.

Signed-off-by: Dave Airlie <airlied@...hat.com>
---
 drivers/gpu/drm/i915/intel_lvds.c |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index b36a521..cf8da64 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -311,10 +311,8 @@ static int intel_lvds_get_modes(struct drm_connector *connector)
 	if (dev_priv->panel_fixed_mode != NULL) {
 		struct drm_display_mode *mode;
 
-		mutex_lock(&dev->mode_config.mutex);
 		mode = drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
 		drm_mode_probed_add(connector, mode);
-		mutex_unlock(&dev->mode_config.mutex);
 
 		return 1;
 	}
-- 
1.6.0.6

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