linux-kernel - [PATCH 1/2] drm/nouveau: Add lock on drm_helper_resume_force

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Date:	Sat, 14 Apr 2012 02:09:04 +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 1/2] drm/nouveau: 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/nouveau/nouveau_drv.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.c b/drivers/gpu/drm/nouveau/nouveau_drv.c
index 4f2030b..6260abe 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.c
@@ -375,7 +375,9 @@ nouveau_pci_resume(struct pci_dev *pdev)
 		nv_crtc->lut.depth = 0;
 	}
 
+	mutex_lock(&dev->mode_config.mutex);
 	drm_helper_resume_force_mode(dev);
+	mutex_unlock(&dev->mode_config.mutex);
 
 	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
 		struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
-- 
1.7.3.4

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