drm/nouveau: Take fence spinlock in nouveau_fence_channel_fini().

Without it there's a potential race with nouveau_fence_update().

Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
index 29fe03b..f70bec8 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_fence.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
@@ -490,6 +490,8 @@ nouveau_fence_channel_fini(struct nouveau_channel *chan)
 {
        struct nouveau_fence *tmp, *fence;
 
+       spin_lock(&chan->fence.lock);
+
        list_for_each_entry_safe(fence, tmp, &chan->fence.pending, entry) {
                fence->signalled = true;
                list_del(&fence->entry);
@@ -499,6 +501,8 @@ nouveau_fence_channel_fini(struct nouveau_channel *chan)
 
                kref_put(&fence->refcount, nouveau_fence_del);
        }
+
+       spin_unlock(&chan->fence.lock);
 }
 
 int