drm/nouveau: fix thinko in channel locking in semaphore path

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
index 42694b122eef..5f9f66f35067 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fence.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
@@ -393,23 +393,23 @@ nouveau_fence_sync(struct nouveau_fence *fence,
                 return nouveau_fence_wait(fence, NULL, false, false);
         }
 
-        /* try to take wchan's mutex, if we can't take it right away
+        /* try to take chan's mutex, if we can't take it right away
          * we have to fallback to software sync to prevent locking
          * order issues
          */
-        if (!mutex_trylock(&wchan->mutex)) {
+        if (!mutex_trylock(&chan->mutex)) {
                 free_semaphore(&sema->ref);
                 return nouveau_fence_wait(fence, NULL, false, false);
         }
 
         /* Make wchan wait until it gets signalled */
         ret = emit_semaphore(wchan, NV_SW_SEMAPHORE_ACQUIRE, sema);
-        mutex_unlock(&wchan->mutex);
         if (ret)
                 goto out;
 
         /* Signal the semaphore from chan */
         ret = emit_semaphore(chan, NV_SW_SEMAPHORE_RELEASE, sema);
+        mutex_unlock(&chan->mutex);
 out:
         kref_put(&sema->ref, free_semaphore);
         return ret;