linux-kernel - [PATCH v2 07/21] crypto: shash, caam: Make use of the new sg

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Date:   Tue, 25 Apr 2017 12:20:54 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, linux-raid@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-scsi@...r.kernel.org, open-iscsi@...glegroups.com,
        megaraidlinux.pdl@...adcom.com, sparmaintainer@...sys.com,
        devel@...verdev.osuosl.org, target-devel@...r.kernel.org,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        dm-devel@...hat.com
Cc:     Christoph Hellwig <hch@....de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        Jens Axboe <axboe@...nel.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Stephen Bates <sbates@...thlin.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH v2 07/21] crypto: shash, caam: Make use of the new sg_map helper function

Very straightforward conversion to the new function in the caam driver
and shash library.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "David S. Miller" <davem@...emloft.net>
---
 crypto/shash.c                | 9 ++++++---
 drivers/crypto/caam/caamalg.c | 8 +++-----
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/crypto/shash.c b/crypto/shash.c
index 5e31c8d..5914881 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -283,10 +283,13 @@ int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
 	if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
 		void *data;
 
-		data = kmap_atomic(sg_page(sg));
-		err = crypto_shash_digest(desc, data + offset, nbytes,
+		data = sg_map(sg, 0, SG_KMAP_ATOMIC);
+		if (IS_ERR(data))
+			return PTR_ERR(data);
+
+		err = crypto_shash_digest(desc, data, nbytes,
 					  req->result);
-		kunmap_atomic(data);
+		sg_unmap(sg, data, 0, SG_KMAP_ATOMIC);
 		crypto_yield(desc->flags);
 	} else
 		err = crypto_shash_init(desc) ?:
diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c
index 398807d..62d2f5d 100644
--- a/drivers/crypto/caam/caamalg.c
+++ b/drivers/crypto/caam/caamalg.c
@@ -89,7 +89,6 @@ static void dbg_dump_sg(const char *level, const char *prefix_str,
 			struct scatterlist *sg, size_t tlen, bool ascii)
 {
 	struct scatterlist *it;
-	void *it_page;
 	size_t len;
 	void *buf;
 
@@ -98,19 +97,18 @@ static void dbg_dump_sg(const char *level, const char *prefix_str,
 		 * make sure the scatterlist's page
 		 * has a valid virtual memory mapping
 		 */
-		it_page = kmap_atomic(sg_page(it));
-		if (unlikely(!it_page)) {
+		buf = sg_map(it, 0, SG_KMAP_ATOMIC);
+		if (IS_ERR(buf)) {
 			printk(KERN_ERR "dbg_dump_sg: kmap failed\n");
 			return;
 		}
 
-		buf = it_page + it->offset;
 		len = min_t(size_t, tlen, it->length);
 		print_hex_dump(level, prefix_str, prefix_type, rowsize,
 			       groupsize, buf, len, ascii);
 		tlen -= len;
 
-		kunmap_atomic(it_page);
+		sg_unmap(it, buf, 0, SG_KMAP_ATOMIC);
 	}
 }
 #endif
-- 
2.1.4