drm/gem: Allow sparsely populated page arrays in drm_gem_put_pages
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 Reviewed-by: Steven Price <steven.price@arm.com> Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Rob Herring <robh@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20190808222200.13176-2-robh@kernel.org
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@ -633,6 +633,9 @@ void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages,
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pagevec_init(&pvec);
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for (i = 0; i < npages; i++) {
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if (!pages[i])
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continue;
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if (dirty)
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set_page_dirty(pages[i]);
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