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drm: mediatek: use common helper for a scatterlist contiguity check 

Use common helper for checking the contiguity of the imported dma-buf and
do this check before allocating resources, so the error path is simpler.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
This commit is contained in:
Marek Szyprowski 2020-05-08 08:25:52 +02:00
parent c3d9c17f48
commit 960db7fcbd
1 changed files with 6 additions and 22 deletions
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28
drivers/gpu/drm/mediatek/mtk_drm_gem.c
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@ -212,37 +212,21 @@ struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach, struct sg_table *sg)
{
struct mtk_drm_gem_obj *mtk_gem;
int ret;
struct scatterlist *s;
unsigned int i;
dma_addr_t expected;
/* check if the entries in the sg_table are contiguous */
if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {
DRM_ERROR("sg_table is not contiguous");
return ERR_PTR(-EINVAL);
}
mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
if (IS_ERR(mtk_gem))
return ERR_CAST(mtk_gem);
expected = sg_dma_address(sg->sgl);
for_each_sg(sg->sgl, s, sg->nents, i) {
if (!sg_dma_len(s))
break;
if (sg_dma_address(s) != expected) {
DRM_ERROR("sg_table is not contiguous");
ret = -EINVAL;
goto err_gem_free;
}
expected = sg_dma_address(s) + sg_dma_len(s);
}
mtk_gem->dma_addr = sg_dma_address(sg->sgl);
mtk_gem->sg = sg;
return &mtk_gem->base;
err_gem_free:
kfree(mtk_gem);
return ERR_PTR(ret);
}
void *mtk_drm_gem_prime_vmap(struct drm_gem_object *obj)