3.8.13.13-rt25-rc1 stable review patch.
If anyone has any objections, please let me know.
------------------
From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Luis captured the following:
| BUG: sleeping function called from invalid context at kernel/rtmutex.c:659
| in_atomic(): 1, irqs_disabled(): 0, pid: 517, name: Xorg
| 2 locks held by Xorg/517:
| #0:
| (
| &dev->vbl_lock
| ){......}
| , at:
| [<ffffffffa0024c60>] drm_vblank_get+0x30/0x2b0 [drm]
| #1:
| (
| &dev->vblank_time_lock
| ){......}
| , at:
| [<ffffffffa0024ce1>] drm_vblank_get+0xb1/0x2b0 [drm]
| Preemption disabled at:
| [<ffffffffa008bc95>] i915_get_vblank_timestamp+0x45/0xa0 [i915]
| CPU: 3 PID: 517 Comm: Xorg Not tainted 3.10.10-rt7+ #5
| Call Trace:
| [<ffffffff8164b790>] dump_stack+0x19/0x1b
| [<ffffffff8107e62f>] __might_sleep+0xff/0x170
| [<ffffffff81651ac4>] rt_spin_lock+0x24/0x60
| [<ffffffffa0084e67>] i915_read32+0x27/0x170 [i915]
| [<ffffffffa008a591>] i915_pipe_enabled+0x31/0x40 [i915]
| [<ffffffffa008a6be>] i915_get_crtc_scanoutpos+0x3e/0x1b0 [i915]
| [<ffffffffa00245d4>] drm_calc_vbltimestamp_from_scanoutpos+0xf4/0x430 [drm]
| [<ffffffffa008bc95>] i915_get_vblank_timestamp+0x45/0xa0 [i915]
| [<ffffffffa0024998>] drm_get_last_vbltimestamp+0x48/0x70 [drm]
| [<ffffffffa0024db5>] drm_vblank_get+0x185/0x2b0 [drm]
| [<ffffffffa0025d03>] drm_wait_vblank+0x83/0x5d0 [drm]
| [<ffffffffa00212a2>] drm_ioctl+0x552/0x6a0 [drm]
| [<ffffffff811a0095>] do_vfs_ioctl+0x325/0x5b0
| [<ffffffff811a03a1>] SyS_ioctl+0x81/0xa0
| [<ffffffff8165a342>] tracesys+0xdd/0xe2
After a longer thread it was decided to drop the preempt_disable()/
enable() invocations which were meant for -RT and Mario Kleiner looks
for a replacement.
Cc: stable-rt@xxxxxxxxxxxxxxx
Reported-By: Luis Claudio R. Goncalves <lclaudio@xxxxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
drivers/gpu/drm/drm_irq.c | 7 -------
1 file changed, 7 deletions(-)
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 0f3cdda..fe7546e 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -624,11 +624,6 @@ 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();
@@ -640,8 +635,6 @@ 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",
--
1.8.4.rc3
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