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drm/exynos: return NULL if exynos_pages_to_sg fails

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exynos_pages_to_sg() internally calls sg_kmalloc() which can return
no pages when the system is under high memory crunch. One such instance
is chromeos-install in the chromeos. This patch adds check for the return
value of the function in subject to return NULL on failure.

Signed-off-by: Subash Patel <subash.ramaswamy@linaro.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
Subash Patel 2012-06-25 11:22:56 -07:00 committed by Inki Dae
parent 9416dfa76a
commit 56fb5380c7
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
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@ -86,6 +86,10 @@ static struct sg_table *
npages = buf->size / buf->page_size;
sgt = exynos_pages_to_sg(buf->pages, npages, buf->page_size);
if (!sgt) {
DRM_DEBUG_PRIME("exynos_pages_to_sg returned NULL!\n");
goto err_unlock;
}
nents = dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir);
DRM_DEBUG_PRIME("npages = %d buffer size = 0x%lx page_size = 0x%lx\n",