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From cbe5c2a67fb145b210652be20a84690e09e4eb25 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Wed, 7 Aug 2019 11:31:08 +0100
Subject: [PATCH] drm/vc4: Add missing NULL check to
vc4_crtc_consume_event
vc4_crtc_consume_event wasn't checking crtc->state->event was
set before dereferencing it, leading to an OOPS.
Fixes "a5b534b drm/vc4: Resolve the vblank warnings on mode switching"
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
---
drivers/gpu/drm/vc4/vc4_firmware_kms.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
@@ -969,6 +969,9 @@ static void vc4_crtc_consume_event(struc
struct drm_device *dev = crtc->dev;
unsigned long flags;
+ if (!crtc->state->event)
+ return;
+
crtc->state->event->pipe = drm_crtc_index(crtc);
WARN_ON(drm_crtc_vblank_get(crtc) != 0);
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