[PATCH xf86-video-ati] Set correct DRM event context version

["Michel Dänzer" <michel-otUistvHUpPR7s880joybQ@public.gmane.org>]

From: Daniel Stone <daniels@collabora.com>

DRM_EVENT_CONTEXT_VERSION is the latest context version supported by
whatever version of libdrm is present. We were blindly asserting we
supported whatever version that may be, even if we actually didn't.

With libdrm 2.4.78, setting a higher context version than 2 will attempt
to call the page_flip_handler2 vfunc if it was non-NULL, which being a
random chunk of stack memory, it might well have been.

Set the version as 2, which should be bumped only with the appropriate
version checks.

Signed-off-by: Daniel Stone <daniels@collabora.com>
(Ported from xserver commit 0c8e6ed85810e96d84173a52d628863802a78d82)

Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
---
 src/drmmode_display.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index ab11583a6..9911c0a6a 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -2538,7 +2538,7 @@ Bool drmmode_pre_init(ScrnInfoPtr pScrn, drmmode_ptr drmmode, int cpp)
 
 	xf86InitialConfiguration(pScrn, TRUE);
 
-	drmmode->event_context.version = DRM_EVENT_CONTEXT_VERSION;
+	drmmode->event_context.version = 2;
 	drmmode->event_context.vblank_handler = radeon_drm_queue_handler;
 	drmmode->event_context.page_flip_handler = radeon_drm_queue_handler;
 
-- 
2.11.0

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