linux-kernel - [PATCH 3.11 015/138] drm/nouveau: fix another lock unbalance in nouveau_crtc_page

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Date:	Tue,  3 Jun 2014 12:37:41 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Maarten Lankhorst <maarten.lankhorst@...onical.com>,
	Ben Skeggs <bskeggs@...hat.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 015/138] drm/nouveau: fix another lock unbalance in nouveau_crtc_page_flip

3.11.10.11 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Maarten Lankhorst <maarten.lankhorst@...onical.com>

commit 806cbc5026933a781b66adecf6d1658fde9138e6 upstream.

Fixes a regression introduced by 060810d7abaabca "drm/nouveau: fix locking
issues in page flipping paths".  chan->cli->mutex is unlocked a second time
in the fail_unreserve path, fix this by moving mutex_unlock down.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@...onical.com>
Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/gpu/drm/nouveau/nouveau_display.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index a03e75deacaf..00d547eaf579 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -583,9 +583,9 @@ nouveau_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
 	}
 
 	ret = nouveau_page_flip_emit(chan, old_bo, new_bo, s, &fence);
-	mutex_unlock(&chan->cli->mutex);
 	if (ret)
 		goto fail_unreserve;
+	mutex_unlock(&chan->cli->mutex);
 
 	/* Update the crtc struct and cleanup */
 	crtc->fb = fb;
-- 
1.9.1

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