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drm/ttm: Fixed a read/write lock imbalance 

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.

Cc: <stable@vger.kernel.org>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
steinar/wifi_calib_4_9_kernel
Thomas Hellstrom 2015-11-20 11:43:50 -08:00
parent 2f1371614a
commit 025af189fb
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/ttm/ttm_lock.c
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@ -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;
}