drm: Add support for interrupt triggered driver callback with lock held to DRM core.

Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/char/drm/drm_lock.c b/drivers/char/drm/drm_lock.c
index f9e45303498d..e0abe5c68423 100644
--- a/drivers/char/drm/drm_lock.c
+++ b/drivers/char/drm/drm_lock.c
@@ -155,6 +155,7 @@ int drm_unlock(struct inode *inode, struct file *filp,
         drm_file_t *priv = filp->private_data;
         drm_device_t *dev = priv->head->dev;
         drm_lock_t lock;
+        unsigned int irqflags;
 
         if (copy_from_user(&lock, (drm_lock_t __user *) arg, sizeof(lock)))
                 return -EFAULT;
@@ -165,6 +166,16 @@ int drm_unlock(struct inode *inode, struct file *filp,
                 return -EINVAL;
         }
 
+        spin_lock_irqsave(&dev->tasklet_lock, irqflags);
+
+        if (dev->locked_tasklet_func) {
+                dev->locked_tasklet_func(dev);
+
+                dev->locked_tasklet_func = NULL;
+        }
+
+        spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
+
         atomic_inc(&dev->counts[_DRM_STAT_UNLOCKS]);
 
         /* kernel_context_switch isn't used by any of the x86 drm