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drm/i915: unload: fix error_work races

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This is the first patch to clean up module unload races due to
outstanding timers/work. Preparatory step: Thou shalt not destroy
the workqueue when new work might still get enqued.

Now error_work gets queued by the hangcheck timer and only (atomically)
reads the chip wedged status. So cancel it right after the hangcheck
timer is killed. But the hangcheck is armed by interrupts, so move
everything after irqs are disabled.

Also change a del_timer to a del_timer_sync in the ums gem code, the
hangcheck timer is self-rearming.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Daniel Vetter 2010-08-20 18:18:48 +02:00 committed by Chris Wilson
parent 24d05927c3
commit bc0c7f1443
2 changed files with 6 additions and 4 deletions
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8
drivers/gpu/drm/i915/i915_dma.c
View File

@ -2256,9 +2256,6 @@ int i915_driver_unload(struct drm_device *dev)
i915_mch_dev = NULL;
spin_unlock(&mchdev_lock);
destroy_workqueue(dev_priv->wq);
del_timer_sync(&dev_priv->hangcheck_timer);
io_mapping_free(dev_priv->mm.gtt_mapping);
if (dev_priv->mm.gtt_mtrr >= 0) {
mtrr_del(dev_priv->mm.gtt_mtrr, dev->agp->base,
@ -2283,6 +2280,9 @@ int i915_driver_unload(struct drm_device *dev)
vga_client_register(dev->pdev, NULL, NULL, NULL);
}
del_timer_sync(&dev_priv->hangcheck_timer);
cancel_work_sync(&dev_priv->error_work);
if (dev->pdev->msi_enabled)
pci_disable_msi(dev->pdev);
@ -2307,6 +2307,8 @@ int i915_driver_unload(struct drm_device *dev)
intel_teardown_mchbar(dev);
destroy_workqueue(dev_priv->wq);
pci_dev_put(dev_priv->bridge_dev);
kfree(dev->dev_private);

2
drivers/gpu/drm/i915/i915_gem.c
View File

@ -4408,7 +4408,7 @@ i915_gem_idle(struct drm_device *dev)
* And not confound mm.suspended!
*/
dev_priv->mm.suspended = 1;
del_timer(&dev_priv->hangcheck_timer);
del_timer_sync(&dev_priv->hangcheck_timer);
i915_kernel_lost_context(dev);
i915_gem_cleanup_ringbuffer(dev);