1 files changed, 28 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0303-drm-vc4-Add-missing-NULL-check-to-vc4_crtc_consume_e.patch b/target/linux/bcm27xx/patches-5.4/950-0303-drm-vc4-Add-missing-NULL-check-to-vc4_crtc_consume_e.patch
new file mode 100644
index 0000000000..f29ba4dc5d
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0303-drm-vc4-Add-missing-NULL-check-to-vc4_crtc_consume_e.patch
@@ -0,0 +1,28 @@
+From e2e9da35d4a598490b73da41eea1db27540339fd 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
+@@ -1000,6 +1000,9 @@ 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);