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: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 089c015..53f0e5a 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -400,27 +400,31 @@
{
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);
}
/**