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Commit e5b4f194 authored by Thomas Hellstrom's avatar Thomas Hellstrom Committed by Dave Airlie
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drm: don't call the vblank tasklet with irqs disabled. 



If a specific tasklet shares data with irq context,
it needs to take a private irq-blocking spinlock within
the tasklet itself.

Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 649ffc06

drivers/gpu/drm/drm_irq.c

+12 −8
Original line number Diff line number Diff line
@@ -400,27 +400,31 @@ static void drm_locked_tasklet_func(unsigned long data) 
{

	struct drm_device *dev = (struct drm_device *)data;

	unsigned long irqflags;

	void (*tasklet_func)(struct drm_device *);

	

	spin_lock_irqsave(&dev->tasklet_lock, irqflags);

	tasklet_func = dev->locked_tasklet_func;

	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);



	if (!dev->locked_tasklet_func ||

	if (!tasklet_func ||

	    !drm_lock_take(&dev->lock,

			   DRM_KERNEL_CONTEXT)) {

		spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);

		return;

	}



	dev->lock.lock_time = jiffies;

	atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);



	dev->locked_tasklet_func(dev);

	spin_lock_irqsave(&dev->tasklet_lock, irqflags);

	tasklet_func = dev->locked_tasklet_func;

	dev->locked_tasklet_func = NULL;

	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);

	

	if (tasklet_func != NULL)

		tasklet_func(dev);



	drm_lock_free(&dev->lock,

		      DRM_KERNEL_CONTEXT);



	dev->locked_tasklet_func = NULL;



	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);

}



/**

drivers/gpu/drm/drm_lock.c

+5 −7
Original line number Diff line number Diff line
@@ -150,6 +150,7 @@ int drm_unlock(struct drm_device *dev, void *data, struct drm_file *file_priv) 
{

	struct drm_lock *lock = data;

	unsigned long irqflags;

	void (*tasklet_func)(struct drm_device *);



	if (lock->context == DRM_KERNEL_CONTEXT) {

		DRM_ERROR("Process %d using kernel context %d\n",
@@ -158,14 +159,11 @@ int drm_unlock(struct drm_device *dev, void *data, struct drm_file *file_priv) 
	}



	spin_lock_irqsave(&dev->tasklet_lock, irqflags);



	if (dev->locked_tasklet_func) {

		dev->locked_tasklet_func(dev);



	tasklet_func = dev->locked_tasklet_func;

	dev->locked_tasklet_func = NULL;

	}



	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);

	if (tasklet_func != NULL)

		tasklet_func(dev);



	atomic_inc(&dev->counts[_DRM_STAT_UNLOCKS]);