target/linux/brcm2708/patches-4.4/0197-drm-vc4-Fix-ERESTARTSYS-error-return-from-BO-waits.patch

   1 From 0304e9381edf30280122d981e5a1b8dedc4c003f Mon Sep 17 00:00:00 2001
   2 From: Eric Anholt <eric@anholt.net>
   3 Date: Mon, 25 Jan 2016 14:32:41 -0800
   4 Subject: [PATCH] drm/vc4: Fix -ERESTARTSYS error return from BO waits.
   5
   6 This caused the wait ioctls to claim that waiting had completed when
   7 we actually got interrupted by a signal before it was done.  Fixes
   8 broken rendering throttling that produced serious lag in X window
   9 dragging.
  10
  11 Signed-off-by: Eric Anholt <eric@anholt.net>
  12 ---
  13  drivers/gpu/drm/vc4/vc4_gem.c | 6 ++----
  14  1 file changed, 2 insertions(+), 4 deletions(-)
  15
  16 --- a/drivers/gpu/drm/vc4/vc4_gem.c
  17 +++ b/drivers/gpu/drm/vc4/vc4_gem.c
  18 @@ -352,12 +352,10 @@ vc4_wait_for_seqno(struct drm_device *de
  19         finish_wait(&vc4->job_wait_queue, &wait);
  20         trace_vc4_wait_for_seqno_end(dev, seqno);
  21
  22 -       if (ret && ret != -ERESTARTSYS) {
  23 +       if (ret && ret != -ERESTARTSYS)
  24                 DRM_ERROR("timeout waiting for render thread idle\n");
  25 -               return ret;
  26 -       }
  27
  28 -       return 0;
  29 +       return ret;
  30  }
  31
  32  static void