crypto: talitos: use sg_pcopy_to_buffer()
Use sg_pcopy_to_buffer() which is better than the function previously used. Because it doesn't do kmap/kunmap for skipped pages. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: "James E.J. Bottomley" <JBottomley@parallels.com> Cc: Douglas Gilbert <dgilbert@interlog.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Horia Geanta <horia.geanta@freescale.com> Cc: Imre Deak <imre.deak@intel.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1112,64 +1112,6 @@ static int sg_count(struct scatterlist *sg_list, int nbytes, bool *chained)
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return sg_nents;
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}
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/**
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* sg_copy_end_to_buffer - Copy end data from SG list to a linear buffer
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* @sgl: The SG list
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* @nents: Number of SG entries
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* @buf: Where to copy to
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* @buflen: The number of bytes to copy
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* @skip: The number of bytes to skip before copying.
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* Note: skip + buflen should equal SG total size.
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*
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* Returns the number of copied bytes.
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*
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**/
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static size_t sg_copy_end_to_buffer(struct scatterlist *sgl, unsigned int nents,
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void *buf, size_t buflen, unsigned int skip)
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{
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unsigned int offset = 0;
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unsigned int boffset = 0;
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struct sg_mapping_iter miter;
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unsigned long flags;
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unsigned int sg_flags = SG_MITER_ATOMIC;
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size_t total_buffer = buflen + skip;
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sg_flags |= SG_MITER_FROM_SG;
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sg_miter_start(&miter, sgl, nents, sg_flags);
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local_irq_save(flags);
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while (sg_miter_next(&miter) && offset < total_buffer) {
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unsigned int len;
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unsigned int ignore;
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if ((offset + miter.length) > skip) {
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if (offset < skip) {
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/* Copy part of this segment */
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ignore = skip - offset;
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len = miter.length - ignore;
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if (boffset + len > buflen)
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len = buflen - boffset;
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memcpy(buf + boffset, miter.addr + ignore, len);
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} else {
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/* Copy all of this segment (up to buflen) */
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len = miter.length;
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if (boffset + len > buflen)
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len = buflen - boffset;
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memcpy(buf + boffset, miter.addr, len);
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}
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boffset += len;
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}
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offset += miter.length;
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}
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sg_miter_stop(&miter);
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local_irq_restore(flags);
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return boffset;
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}
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/*
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* allocate and map the extended descriptor
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*/
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@ -1800,7 +1742,7 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
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if (to_hash_later) {
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int nents = sg_count(areq->src, nbytes, &chained);
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sg_copy_end_to_buffer(areq->src, nents,
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sg_pcopy_to_buffer(areq->src, nents,
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req_ctx->bufnext,
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to_hash_later,
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nbytes - to_hash_later);
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