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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2015-06-16 08:54:22 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-06-17 10:35:08 +0300 |
| commit | 6c94711cbdf595766bc3295e437c3579943cd846 (patch) | |
| tree | b718b155bf880275c71ee5a2d4525f7468f3a566 | |
| parent | 201f28f055917300c3301b19d0e0e674b9cf8cb7 (diff) | |
| download | linux-6c94711cbdf595766bc3295e437c3579943cd846.tar.xz | |
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: Herbert Xu <herbert@gondor.apana.org.au>
| -rw-r--r-- | drivers/crypto/caam/sg_sw_sec4.h | 35 |
1 files changed, 21 insertions, 14 deletions
diff --git a/drivers/crypto/caam/sg_sw_sec4.h b/drivers/crypto/caam/sg_sw_sec4.h index efbc1db8da53..b68b74cc7b77 100644 --- a/drivers/crypto/caam/sg_sw_sec4.h +++ b/drivers/crypto/caam/sg_sw_sec4.h @@ -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); + if (!dma_map_sg(dev, sg, 1, dir)) { + dma_unmap_sg_chained(dev, first, i, dir, + chained); + nents = 0; + break; + } + sg = sg_next(sg); } - } else { - dma_unmap_sg(dev, sg, nents, dir); - } + } else + nents = dma_map_sg(dev, sg, nents, dir); + return nents; } |