linux-kernel - [PATCH 3.4 065/125] drm/ttm: Fixed a read/write lock imbalance

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Date:   Wed, 12 Oct 2016 20:33:01 +0800
From:   lizf@...nel.org
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Thomas Hellstrom <thellstrom@...are.com>,
        Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 065/125] drm/ttm: Fixed a read/write lock imbalance

From: Thomas Hellstrom <thellstrom@...are.com>

3.4.113-rc1 review patch.  If anyone has any objections, please let me know.

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


commit 025af189fb44250206dd8a32fa4a682392af3301 upstream.

In ttm_write_lock(), the uninterruptible path should call
__ttm_write_lock() not __ttm_read_lock().  This fixes a vmwgfx hang
on F23 start up.

syeh: Extracted this from one of Thomas' internal patches.

Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
Reviewed-by: Sinclair Yeh <syeh@...are.com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/gpu/drm/ttm/ttm_lock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/ttm_lock.c b/drivers/gpu/drm/ttm/ttm_lock.c
index 075daf4..9934b4d 100644
--- a/drivers/gpu/drm/ttm/ttm_lock.c
+++ b/drivers/gpu/drm/ttm/ttm_lock.c
@@ -180,7 +180,7 @@ int ttm_write_lock(struct ttm_lock *lock, bool interruptible)
 			spin_unlock(&lock->lock);
 		}
 	} else
-		wait_event(lock->queue, __ttm_read_lock(lock));
+		wait_event(lock->queue, __ttm_write_lock(lock));
 
 	return ret;
 }
-- 
1.9.1