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>

1 files changed, 1 insertions, 59 deletions

diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index 5b2b5e61e4f9..661dc3eb1d66 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -1112,64 +1112,6 @@ static int sg_count(struct scatterlist *sg_list, int nbytes, bool *chained)
         return sg_nents;
 }
 
-/**
- * sg_copy_end_to_buffer - Copy end data from SG list to a linear buffer
- * @sgl:                 The SG list
- * @nents:               Number of SG entries
- * @buf:                 Where to copy to
- * @buflen:              The number of bytes to copy
- * @skip:                The number of bytes to skip before copying.
- *                       Note: skip + buflen should equal SG total size.
- *
- * Returns the number of copied bytes.
- *
- **/
-static size_t sg_copy_end_to_buffer(struct scatterlist *sgl, unsigned int nents,
-                                    void *buf, size_t buflen, unsigned int skip)
-{
-        unsigned int offset = 0;
-        unsigned int boffset = 0;
-        struct sg_mapping_iter miter;
-        unsigned long flags;
-        unsigned int sg_flags = SG_MITER_ATOMIC;
-        size_t total_buffer = buflen + skip;
-
-        sg_flags |= SG_MITER_FROM_SG;
-
-        sg_miter_start(&miter, sgl, nents, sg_flags);
-
-        local_irq_save(flags);
-
-        while (sg_miter_next(&miter) && offset < total_buffer) {
-                unsigned int len;
-                unsigned int ignore;
-
-                if ((offset + miter.length) > skip) {
-                        if (offset < skip) {
-                                /* Copy part of this segment */
-                                ignore = skip - offset;
-                                len = miter.length - ignore;
-                                if (boffset + len > buflen)
-                                        len = buflen - boffset;
-                                memcpy(buf + boffset, miter.addr + ignore, len);
-                        } else {
-                                /* Copy all of this segment (up to buflen) */
-                                len = miter.length;
-                                if (boffset + len > buflen)
-                                        len = buflen - boffset;
-                                memcpy(buf + boffset, miter.addr, len);
-                        }
-                        boffset += len;
-                }
-                offset += miter.length;
-        }
-
-        sg_miter_stop(&miter);
-
-        local_irq_restore(flags);
-        return boffset;
-}
-
 /*
  * allocate and map the extended descriptor
  */
@@ -1800,7 +1742,7 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
 
         if (to_hash_later) {
                 int nents = sg_count(areq->src, nbytes, &chained);
-                sg_copy_end_to_buffer(areq->src, nents,
+                sg_pcopy_to_buffer(areq->src, nents,
                                       req_ctx->bufnext,
                                       to_hash_later,
                                       nbytes - to_hash_later);