drm/i915: Handle GPU hangs during fault gracefully.

Instead of killing the process, just return no page found and reschedule
the process giving the GPU some time to (hopefully) recover.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 47c665eeaf17..7c91bf2bbdfd 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1340,11 +1340,12 @@ unlock:
         mutex_unlock(&dev->struct_mutex);
 
         switch (ret) {
+        case -EAGAIN:
+                set_need_resched();
         case 0:
         case -ERESTARTSYS:
                 return VM_FAULT_NOPAGE;
         case -ENOMEM:
-        case -EAGAIN:
                 return VM_FAULT_OOM;
         default:
                 return VM_FAULT_SIGBUS;