openwrt/target/linux/brcm2708/patches-4.4/0288-drm-vc4-Fix-a-framebuffer-reference-leak-on-async-fl.patch

From af6fb397532633e85bb101801d8156b2263aa54f Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Fri, 5 Feb 2016 15:06:15 -0800
Subject: [PATCH 288/304] drm/vc4: Fix a framebuffer reference leak on async
 flip interrupt.

We'd need X to queue up an async pageflip while another is
outstanding, and then take a SIGIO.  I think X actually avoids sending
out the next pageflip while one's already queued, but I'm not sure.

Signed-off-by: Eric Anholt <eric@anholt.net>
(cherry picked from commit 48627eb8dc55c60d35794105f6f79fb627347dbd)
---
 drivers/gpu/drm/vc4/vc4_crtc.c | 1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -527,6 +527,7 @@ static int vc4_async_page_flip(struct dr
 	/* Make sure all other async modesetes have landed. */
 	ret = down_interruptible(&vc4->async_modeset);
 	if (ret) {
+		drm_framebuffer_unreference(fb);
 		kfree(flip_state);
 		return ret;
 	}