linux-kernel - [PATCH 3.13 141/160] drm/nouveau: fix another lock unbalance in nouveau_crtc_page

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Message-Id: <1402429600-20477-142-git-send-email-kamal@canonical.com>
Date:	Tue, 10 Jun 2014 12:46:21 -0700
From:	Kamal Mostafa <kamal@...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>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 141/160] drm/nouveau: fix another lock unbalance in nouveau_crtc_page_flip

3.13.11.3 -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: Kamal Mostafa <kamal@...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 91c826c..a0b2b87 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -658,9 +658,9 @@ 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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