[PATCH v4 1/9] drm/gem: Allow sparsely populated page arrays in drm_gem_put_pages

[Rob Herring]

Panfrost has a need for pages allocated on demand via GPU page faults.
When releasing the pages, the only thing preventing using
drm_gem_put_pages() is needing to skip over unpopulated pages, so allow
for skipping over NULL struct page pointers.

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: dri-devel at lists.freedesktop.org
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.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index afc38cece3f5..a2dd198177f2 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -633,6 +633,9 @@ void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
 
 	pagevec_init(&pvec);
 	for (i = 0; i < npages; i++) {
+		if (!pages[i])
+			continue;
+
 		if (dirty)
 			set_page_dirty(pages[i]);
 
-- 
2.20.1