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authorDaniel Vetter <daniel.vetter@ffwll.ch>2015-08-07 13:31:17 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2015-08-07 15:35:53 +0300
commit209e4dbc8dcdb2b1839f18fd1cf07ec7bedadf4d (patch)
treec9722b8253e9cd427c7d919280416111c3b5048f /drivers
parent047fe6e6db9161e69271f56daaafdaf2add023b1 (diff)
downloadlinux-209e4dbc8dcdb2b1839f18fd1cf07ec7bedadf4d.tar.xz
drm/vblank: Use u32 consistently for vblank counters
In commit 99264a61dfcda41d86d0960cf2d4c0fc2758a773 Author: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Wed Apr 15 19:34:43 2015 +0200 drm/vblank: Fixup and document timestamp update/read barriers I've switched vblank->count from atomic_t to unsigned long and accidentally created an integer comparison bug in drm_vblank_count_and_time since vblanke->count might overflow the u32 local copy and hence the retry loop never succeed. Fix this by consistently using u32. Cc: Michel Dänzer <michel@daenzer.net> Reported-by: Michel Dänzer <michel@daenzer.net> Reviewed-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/drm_irq.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index f9cc68fbd2a3..b50fa0afd907 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -75,7 +75,7 @@ module_param_named(timestamp_precision_usec, drm_timestamp_precision, int, 0600)
module_param_named(timestamp_monotonic, drm_timestamp_monotonic, int, 0600);
static void store_vblank(struct drm_device *dev, int crtc,
- unsigned vblank_count_inc,
+ u32 vblank_count_inc,
struct timeval *t_vblank)
{
struct drm_vblank_crtc *vblank = &dev->vblank[crtc];