This is a note to let you know that I've just added the patch titled
drm/i915: don't set unpin_work if vblank_get fails
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-don-t-set-unpin_work-if-vblank_get-fails.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7317c75e66fce0c9f82fbe6f72f7e5256b315422 Mon Sep 17 00:00:00 2001
From: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Date: Mon, 29 Aug 2011 09:45:28 -0700
Subject: drm/i915: don't set unpin_work if vblank_get fails
From: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
commit 7317c75e66fce0c9f82fbe6f72f7e5256b315422 upstream.
This fixes a race where we may try to finish a page flip and decrement
the refcount even if our vblank_get failed and we ended up with a
spurious flip pending interrupt.
Fixes https://bugs.freedesktop.org/show_bug.cgi?id=34211.
Signed-off-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Signed-off-by: Keith Packard <keithp@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_display.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6524,11 +6524,16 @@ static int intel_crtc_page_flip(struct d
work->old_fb_obj = intel_fb->obj;
INIT_WORK(&work->work, intel_unpin_work_fn);
+ ret = drm_vblank_get(dev, intel_crtc->pipe);
+ if (ret)
+ goto free_work;
+
/* We borrow the event spin lock for protecting unpin_work */
spin_lock_irqsave(&dev->event_lock, flags);
if (intel_crtc->unpin_work) {
spin_unlock_irqrestore(&dev->event_lock, flags);
kfree(work);
+ drm_vblank_put(dev, intel_crtc->pipe);
DRM_DEBUG_DRIVER("flip queue: crtc already busy\n");
return -EBUSY;
@@ -6547,10 +6552,6 @@ static int intel_crtc_page_flip(struct d
crtc->fb = fb;
- ret = drm_vblank_get(dev, intel_crtc->pipe);
- if (ret)
- goto cleanup_objs;
-
work->pending_flip_obj = obj;
work->enable_stall_check = true;
@@ -6572,7 +6573,6 @@ static int intel_crtc_page_flip(struct d
cleanup_pending:
atomic_sub(1 << intel_crtc->plane, &work->old_fb_obj->pending_flip);
-cleanup_objs:
drm_gem_object_unreference(&work->old_fb_obj->base);
drm_gem_object_unreference(&obj->base);
mutex_unlock(&dev->struct_mutex);
@@ -6581,6 +6581,8 @@ cleanup_objs:
intel_crtc->unpin_work = NULL;
spin_unlock_irqrestore(&dev->event_lock, flags);
+ drm_vblank_put(dev, intel_crtc->pipe);
+free_work:
kfree(work);
return ret;
Patches currently in stable-queue which might be from jbarnes@xxxxxxxxxxxxxxxx are
queue-3.0/drm-i915-don-t-set-unpin_work-if-vblank_get-fails.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html