drm/i915: Workaround erratum on i830 for TAIL pointer within last 2 cachelines

[~andy/linux] / drivers / gpu / drm / drm_lock.c

diff --git a/drivers/gpu/drm/drm_lock.c b/drivers/gpu/drm/drm_lock.c
index d9146f240d3348d76df1d307786a5a884c4aee77..632ae243ede0b9f1df4b42f2e96b30479be4e05a 100644 (file)
--- a/drivers/gpu/drm/drm_lock.c
+++ b/drivers/gpu/drm/drm_lock.c
@@ -37,6 +37,8 @@
 
 static int drm_notifier(void *priv);
 
+static int drm_lock_take(struct drm_lock_data *lock_data, unsigned int context);
+
 /**
  * Lock ioctl.
  *
@@ -150,6 +152,7 @@ int drm_lock(struct drm_device *dev, void *data, struct drm_file *file_priv)
 int drm_unlock(struct drm_device *dev, void *data, struct drm_file *file_priv)
 {
        struct drm_lock *lock = data;
+       struct drm_master *master = file_priv->master;
 
        if (lock->context == DRM_KERNEL_CONTEXT) {
                DRM_ERROR("Process %d using kernel context %d\n",
@@ -159,6 +162,10 @@ int drm_unlock(struct drm_device *dev, void *data, struct drm_file *file_priv)
 
        atomic_inc(&dev->counts[_DRM_STAT_UNLOCKS]);
 
+       if (drm_lock_free(&master->lock, lock->context)) {
+               /* FIXME: Should really bail out here. */
+       }
+
        unblock_all_signals();
        return 0;
 }
@@ -172,6 +179,7 @@ int drm_unlock(struct drm_device *dev, void *data, struct drm_file *file_priv)
  *
  * Attempt to mark the lock as held by the given context, via the \p cmpxchg instruction.
  */
+static
 int drm_lock_take(struct drm_lock_data *lock_data,
                  unsigned int context)
 {
@@ -208,7 +216,6 @@ int drm_lock_take(struct drm_lock_data *lock_data,
        }
        return 0;
 }
-EXPORT_SYMBOL(drm_lock_take);
 
 /**
  * This takes a lock forcibly and hands it to context. Should ONLY be used
@@ -276,7 +283,6 @@ int drm_lock_free(struct drm_lock_data *lock_data, unsigned int context)
        wake_up_interruptible(&lock_data->lock_queue);
        return 0;
 }
-EXPORT_SYMBOL(drm_lock_free);
 
 /**
  * If we get here, it means that the process has called DRM_IOCTL_LOCK
@@ -339,7 +345,6 @@ void drm_idlelock_take(struct drm_lock_data *lock_data)
        }
        spin_unlock_bh(&lock_data->spinlock);
 }
-EXPORT_SYMBOL(drm_idlelock_take);
 
 void drm_idlelock_release(struct drm_lock_data *lock_data)
 {
@@ -359,8 +364,6 @@ void drm_idlelock_release(struct drm_lock_data *lock_data)
        }
        spin_unlock_bh(&lock_data->spinlock);
 }
-EXPORT_SYMBOL(drm_idlelock_release);
-
 
 int drm_i_have_hw_lock(struct drm_device *dev, struct drm_file *file_priv)
 {
@@ -369,5 +372,3 @@ int drm_i_have_hw_lock(struct drm_device *dev, struct drm_file *file_priv)
                _DRM_LOCK_IS_HELD(master->lock.hw_lock->lock) &&
                master->lock.file_priv == file_priv);
 }
-
-EXPORT_SYMBOL(drm_i_have_hw_lock);