[PATCH v4 2/8] drm/omap: add omap_gem_unpin_locked()

[Jean-Jacques Hiblot]

From: Tomi Valkeinen <tomi.valkeinen at ti.com>

Add omap_gem_unpin_locked() which is a version of omap_gem_unpin() that
expects the caller to hold the omap_obj lock.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen at ti.com>
Reviewed-by: Jean-Jacques Hiblot <jjhiblot at ti.com>
---
 drivers/gpu/drm/omapdrm/omap_gem.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c
index 5c97ff810b5d..3071e815da73 100644
--- a/drivers/gpu/drm/omapdrm/omap_gem.c
+++ b/drivers/gpu/drm/omapdrm/omap_gem.c
@@ -832,20 +832,16 @@ int omap_gem_pin(struct drm_gem_object *obj, dma_addr_t *dma_addr)
 }
 
 /**
- * omap_gem_unpin() - Unpin a GEM object from memory
+ * omap_gem_unpin_locked() - Unpin a GEM object from memory
  * @obj: the GEM object
  *
- * Unpin the given GEM object previously pinned with omap_gem_pin(). Pins are
- * reference-counted, the actualy unpin will only be performed when the number
- * of calls to this function matches the number of calls to omap_gem_pin().
+ * omap_gem_unpin() without locking.
  */
-void omap_gem_unpin(struct drm_gem_object *obj)
+static void omap_gem_unpin_locked(struct drm_gem_object *obj)
 {
 	struct omap_gem_object *omap_obj = to_omap_bo(obj);
 	int ret;
 
-	mutex_lock(&omap_obj->lock);
-
 	if (refcount_dec_and_test(&omap_obj->dma_addr_cnt)) {
 		ret = tiler_unpin(omap_obj->block);
 		if (ret) {
@@ -860,7 +856,22 @@ void omap_gem_unpin(struct drm_gem_object *obj)
 		omap_obj->dma_addr = 0;
 		omap_obj->block = NULL;
 	}
+}
 
+/**
+ * omap_gem_unpin() - Unpin a GEM object from memory
+ * @obj: the GEM object
+ *
+ * Unpin the given GEM object previously pinned with omap_gem_pin(). Pins are
+ * reference-counted, the actual unpin will only be performed when the number
+ * of calls to this function matches the number of calls to omap_gem_pin().
+ */
+void omap_gem_unpin(struct drm_gem_object *obj)
+{
+	struct omap_gem_object *omap_obj = to_omap_bo(obj);
+
+	mutex_lock(&omap_obj->lock);
+	omap_gem_unpin_locked(obj);
 	mutex_unlock(&omap_obj->lock);
 }
 
-- 
2.17.1