target/linux/bcm27xx/patches-5.4/950-0295-drm-vc4-Add-missing-NULL-check-to-vc4_crtc_consume_e.patch

   1 From e2e9da35d4a598490b73da41eea1db27540339fd Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.org>
   3 Date: Wed, 7 Aug 2019 11:31:08 +0100
   4 Subject: [PATCH] drm/vc4: Add missing NULL check to
   5  vc4_crtc_consume_event
   6
   7 vc4_crtc_consume_event wasn't checking crtc->state->event was
   8 set before dereferencing it, leading to an OOPS.
   9
  10 Fixes "a5b534b drm/vc4: Resolve the vblank warnings on mode switching"
  11
  12 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  13 ---
  14  drivers/gpu/drm/vc4/vc4_firmware_kms.c | 3 +++
  15  1 file changed, 3 insertions(+)
  16
  17 --- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  18 +++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
  19 @@ -1000,6 +1000,9 @@ static void vc4_crtc_consume_event(struc
  20         struct drm_device *dev = crtc->dev;
  21         unsigned long flags;
  22
  23 +       if (!crtc->state->event)
  24 +               return;
  25 +
  26         crtc->state->event->pipe = drm_crtc_index(crtc);
  27
  28         WARN_ON(drm_crtc_vblank_get(crtc) != 0);