drm/omap: return error if dma_alloc_writecombine fails

On a platform with no TILER (e.g. omap3, am43xx), when the user wants to
allocate buffer with flag OMAP_BO_SCANOUT, the buffer needs to be
allocated with dma_alloc_writecombine. For some reason the driver does
not return an error if that alloc fails, instead it continues without
backing memory. This leads to errors later when the user tries to use
the buffer.

This patch makes the driver return an error if dma_alloc_writecombine
fails.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c
index 2ab77801cf5f070ab08bc5f8255c6126291b94b3..874eb6dcf94b7d027c0714c53466bf25e25d7fc3 100644 (file)
--- a/drivers/gpu/drm/omapdrm/omap_gem.c
+++ b/drivers/gpu/drm/omapdrm/omap_gem.c
@@ -1378,11 +1378,7 @@ struct drm_gem_object *omap_gem_new(struct drm_device *dev,
 
        omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL);
        if (!omap_obj)
-               goto fail;
-
-       spin_lock(&priv->list_lock);
-       list_add(&omap_obj->mm_list, &priv->obj_list);
-       spin_unlock(&priv->list_lock);
+               return NULL;
 
        obj = &omap_obj->base;
 
@@ -1392,11 +1388,19 @@ struct drm_gem_object *omap_gem_new(struct drm_device *dev,
                 */
                omap_obj->vaddr =  dma_alloc_writecombine(dev->dev, size,
                                &omap_obj->paddr, GFP_KERNEL);
-               if (omap_obj->vaddr)
-                       flags |= OMAP_BO_DMA;
+               if (!omap_obj->vaddr) {
+                       kfree(omap_obj);
 
+                       return NULL;
+               }
+
+               flags |= OMAP_BO_DMA;
        }
 
+       spin_lock(&priv->list_lock);
+       list_add(&omap_obj->mm_list, &priv->obj_list);
+       spin_unlock(&priv->list_lock);
+
        omap_obj->flags = flags;
 
        if (flags & OMAP_BO_TILED) {