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>

1 files changed, 5 insertions, 7 deletions

diff --git a/drivers/gpu/drm/drm_lock.c b/drivers/gpu/drm/drm_lock.c
index 0998723cde79..d78e0dc18245 100644
--- a/drivers/gpu/drm/drm_lock.c
+++ b/drivers/gpu/drm/drm_lock.c
@@ -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);
-
-                dev->locked_tasklet_func = NULL;
-        }
-
+        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]);