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Commit 6c94711c authored by Herbert Xu's avatar Herbert Xu
Browse files

crypto: caam - Handle errors in dma_map_sg_chained 



Currently dma_map_sg_chained does not handle errors from the
underlying dma_map_sg calls.  This patch adds rollback in case
of an error by simply calling dma_unmap_sg_chained for the ones
that we've already mapped.

All current callers ignore the return value so this should have
no impact on them.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 201f28f0

drivers/crypto/caam/sg_sw_sec4.h

+21 −14
Original line number Diff line number Diff line
@@ -100,34 +100,41 @@ static inline int sg_count(struct scatterlist *sg_list, int nbytes, 
	return sg_nents;

}



static int dma_map_sg_chained(struct device *dev, struct scatterlist *sg,

			      unsigned int nents, enum dma_data_direction dir,

			      bool chained)

static inline void dma_unmap_sg_chained(

	struct device *dev, struct scatterlist *sg, unsigned int nents,

	enum dma_data_direction dir, bool chained)

{

	if (unlikely(chained)) {

		int i;

		for (i = 0; i < nents; i++) {

			dma_map_sg(dev, sg, 1, dir);

			dma_unmap_sg(dev, sg, 1, dir);

			sg = sg_next(sg);

		}

	} else {

		dma_map_sg(dev, sg, nents, dir);

	} else if (nents) {

		dma_unmap_sg(dev, sg, nents, dir);

	}

	return nents;

}



static int dma_unmap_sg_chained(struct device *dev, struct scatterlist *sg,

				unsigned int nents, enum dma_data_direction dir,

				bool chained)

static inline int dma_map_sg_chained(

	struct device *dev, struct scatterlist *sg, unsigned int nents,

	enum dma_data_direction dir, bool chained)

{

	struct scatterlist *first = sg;



	if (unlikely(chained)) {

		int i;

		for (i = 0; i < nents; i++) {

			dma_unmap_sg(dev, sg, 1, dir);

			sg = sg_next(sg);

			if (!dma_map_sg(dev, sg, 1, dir)) {

				dma_unmap_sg_chained(dev, first, i, dir,

						     chained);

				nents = 0;

				break;

			}

	} else {

		dma_unmap_sg(dev, sg, nents, dir);



			sg = sg_next(sg);

		}

	} else

		nents = dma_map_sg(dev, sg, nents, dir);



	return nents;

}