[PATCH v2 1/7] drm/gem: Allow sparsely populated page arrays in drm_gem_put_pages

From: Rob Herring <robh@kernel.org>
To: dri-devel@lists.freedesktop.org
Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>,
	Maxime Ripard <maxime.ripard@bootlin.com>,
	Sean Paul <sean@poorly.run>, Steven Price <steven.price@arm.com>,
	David Airlie <airlied@linux.ie>,
	Boris Brezillon <boris.brezillon@collabora.com>,
	Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>,
	Robin Murphy <robin.murphy@arm.com>
Subject: [PATCH v2 1/7] drm/gem: Allow sparsely populated page arrays in drm_gem_put_pages
Date: Wed, 24 Jul 2019 19:09:57 -0600	[thread overview]
Message-ID: <20190725011003.30837-2-robh@kernel.org> (raw)
In-Reply-To: <20190725011003.30837-1-robh@kernel.org>

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@linux.intel.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Rob Herring <robh@kernel.org>
---
v2:
 - new patch

 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 243f43d70f42..db373c945f16 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
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