ttm: Return -ERESTART when a signal interrupts bo eviction.

A bug caused the ttm code to just terminate the wait when a signal
was received while waiting for the GPU to release a buffer object that
was to be evicted.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 1587aeca7bea..b82ba6e5a586 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -527,9 +527,12 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo, unsigned mem_type,
         ret = ttm_bo_wait(bo, false, interruptible, no_wait);
         spin_unlock(&bo->lock);
 
-        if (ret && ret != -ERESTART) {
-                printk(KERN_ERR TTM_PFX "Failed to expire sync object before "
-                       "buffer eviction.\n");
+        if (unlikely(ret != 0)) {
+                if (ret != -ERESTART) {
+                        printk(KERN_ERR TTM_PFX
+                               "Failed to expire sync object before "
+                               "buffer eviction.\n");
+                }
                 goto out;
         }