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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-08-07 12:31:17 +0200 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2015-08-07 14:35:53 +0200 |
| commit | 209e4dbc8dcdb2b1839f18fd1cf07ec7bedadf4d (patch) | |
| tree | c9722b8253e9cd427c7d919280416111c3b5048f | |
| parent | 047fe6e6db9161e69271f56daaafdaf2add023b1 (diff) | |
| download | linux-209e4dbc8dcdb2b1839f18fd1cf07ec7bedadf4d.tar.bz2 | |
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>
| -rw-r--r-- | drivers/gpu/drm/drm_irq.c | 2 | ||||
| -rw-r--r-- | include/drm/drmP.h | 2 |
2 files changed, 2 insertions, 2 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]; diff --git a/include/drm/drmP.h b/include/drm/drmP.h index 48db6a56975f..5aa519711e0b 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -691,7 +691,7 @@ struct drm_vblank_crtc { struct timer_list disable_timer; /* delayed disable timer */ /* vblank counter, protected by dev->vblank_time_lock for writes */ - unsigned long count; + u32 count; /* vblank timestamps, protected by dev->vblank_time_lock for writes */ struct timeval time[DRM_VBLANKTIME_RBSIZE]; |