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

[Steven Price]

On 25/07/2019 02:09, Rob Herring wrote:
> 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
> Signed-off-by: Rob Herring <robh at kernel.org>

LGTM: Reviewed-by: Steven Price <steven.price at arm.com>

> ---
> 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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