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drm: Remove preempt_disable() from vblank timestamping code.

Browse source 
Preemption handling will get pushed into the kms
drivers in followup patches, to make timestamping
more robust and PREEMPT_RT friendly.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Mario Kleiner 2013-10-30 05:13:05 +01:00 committed by Dave Airlie
parent bbf1f8bfef
commit 862cc8b4bb
1 changed files with 0 additions and 7 deletions
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7
drivers/gpu/drm/drm_irq.c
View file

@ -586,11 +586,6 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
* code gets preempted or delayed for some reason.
*/
for (i = 0; i < DRM_TIMESTAMP_MAXRETRIES; i++) {
/* Disable preemption to make it very likely to
* succeed in the first iteration even on PREEMPT_RT kernel.
*/
preempt_disable();
/* Get system timestamp before query. */
stime = ktime_get();
@ -602,8 +597,6 @@ int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,
if (!drm_timestamp_monotonic)
mono_time_offset = ktime_get_monotonic_offset();
preempt_enable();
/* Return as no-op if scanout query unsupported or failed. */
if (!(vbl_status & DRM_SCANOUTPOS_VALID)) {
DRM_DEBUG("crtc %d : scanoutpos query failed [%d].\n",