linux-kernel - [PATCH 2/2] drm/radeon: Add lock on drm_helper_resume_force

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Date:	Sat, 14 Apr 2012 02:09:05 +0200
From:	Peter Huewe <peterhuewe@....de>
To:	David Airlie <airlied@...ux.ie>
Cc:	Ben Skeggs <bskeggs@...hat.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Dave Airlie <airlied@...hat.com>,
	Alex Deucher <alexander.deucher@....com>,
	Jerome Glisse <jglisse@...hat.com>,
	Christian König <deathsimple@...afone.de>,
	Michel Dänzer <michel.daenzer@....com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, Peter Huewe <peterhuewe@....de>,
	stable@...nel.org
Subject: [PATCH 2/2] drm/radeon: Add lock on drm_helper_resume_force_mode

mode_config should be locked when calling drm_helper_resume_force_mode.
This patch adds the lock, similar to #927a2f119.

Cc: stable@...nel.org
Signed-off-by: Peter Huewe <peterhuewe@....de>
---
 drivers/gpu/drm/radeon/radeon_device.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index ea7df16..d287f23 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -973,7 +973,9 @@ int radeon_resume_kms(struct drm_device *dev)
 	/* reset hpd state */
 	radeon_hpd_init(rdev);
 	/* blat the mode back in */
+	mutex_lock(&dev->mode_config.mutex);
 	drm_helper_resume_force_mode(dev);
+	mutex_unlock(&dev->mode_config.mutex);
 	/* turn on display hw */
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 		drm_helper_connector_dpms(connector, DRM_MODE_DPMS_ON);
-- 
1.7.3.4

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