[PATCH v4 2/9] drm/shmem: Put pages independent of a SG table being set

[Rob Herring]

If a driver does its own management of pages, the shmem helper object's
pages array could be allocated when a SG table is not. There's not
really any  good reason to tie putting pages with having a SG table when
freeing the object, so just put pages if the pages array is populated.

Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: Maxime Ripard <maxime.ripard at bootlin.com>
Cc: Sean Paul <sean at poorly.run>
Cc: David Airlie <airlied at linux.ie>
Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: Eric Anholt <eric at anholt.net>
Reviewed-by: Steven Price <steven.price at arm.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig at collabora.com>
Signed-off-by: Rob Herring <robh at kernel.org>
---
 drivers/gpu/drm/drm_gem_shmem_helper.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 4b442576de1c..df8f2c8adb2b 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -119,11 +119,11 @@ void drm_gem_shmem_free_object(struct drm_gem_object *obj)
 		if (shmem->sgt) {
 			dma_unmap_sg(obj->dev->dev, shmem->sgt->sgl,
 				     shmem->sgt->nents, DMA_BIDIRECTIONAL);
-
-			drm_gem_shmem_put_pages(shmem);
 			sg_free_table(shmem->sgt);
 			kfree(shmem->sgt);
 		}
+		if (shmem->pages)
+			drm_gem_shmem_put_pages(shmem);
 	}
 
 	WARN_ON(shmem->pages_use_count);
-- 
2.20.1