diff options
| author | Victoria Milhoan <vicki.milhoan@freescale.com> | 2015-08-05 11:28:41 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-08-10 23:19:00 +0800 |
| commit | ec0273039b6606ae08132f41854381e0d7371ded (patch) | |
| tree | 428c427800e3e2f1b412f06cf8b3c84837811cf5 /drivers/crypto/caam | |
| parent | 7d5196aba3c81999d56b26daa5ea7590513cdc1f (diff) | |
| download | linux-ec0273039b6606ae08132f41854381e0d7371ded.tar.gz | |
crypto: caam - Use local sg pointers to walk the scatterlist
Avoid moving the head of the scatterlist entry by using temporary pointers to walk the scatterlist. Signed-off-by: Victoria Milhoan <vicki.milhoan@freescale.com> Tested-by: Horia Geantă <horia.geanta@freescale.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/caam')
| -rw-r--r-- | drivers/crypto/caam/sg_sw_sec4.h | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/drivers/crypto/caam/sg_sw_sec4.h b/drivers/crypto/caam/sg_sw_sec4.h index 711bb3949779..18cd6d1f5870 100644 --- a/drivers/crypto/caam/sg_sw_sec4.h +++ b/drivers/crypto/caam/sg_sw_sec4.h @@ -105,9 +105,15 @@ static inline void dma_unmap_sg_chained( { if (unlikely(chained)) { int i; + struct scatterlist *tsg = sg; + + /* + * Use a local copy of the sg pointer to avoid moving the + * head of the list pointed to by sg as we walk the list. + */ for (i = 0; i < nents; i++) { - dma_unmap_sg(dev, sg, 1, dir); - sg = sg_next(sg); + dma_unmap_sg(dev, tsg, 1, dir); + tsg = sg_next(tsg); } } else if (nents) { dma_unmap_sg(dev, sg, nents, dir); @@ -118,19 +124,23 @@ 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; + struct scatterlist *tsg = sg; + + /* + * Use a local copy of the sg pointer to avoid moving the + * head of the list pointed to by sg as we walk the list. + */ for (i = 0; i < nents; i++) { - if (!dma_map_sg(dev, sg, 1, dir)) { - dma_unmap_sg_chained(dev, first, i, dir, + if (!dma_map_sg(dev, tsg, 1, dir)) { + dma_unmap_sg_chained(dev, sg, i, dir, chained); nents = 0; break; } - sg = sg_next(sg); + tsg = sg_next(tsg); } } else nents = dma_map_sg(dev, sg, nents, dir); |