linux-kernel - [PATCH v2] crypto: omap-sham: Add the offset of sg page to vaddr

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Date:	Thu, 2 Apr 2015 15:32:45 +0530
From:	Lokesh Vutla <lokeshvutla@...com>
To:	<herbert@...dor.apana.org.au>, <linux-crypto@...r.kernel.org>
CC:	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<nsekhar@...com>, <t-kristo@...com>,
	Lokesh Vutla <lokeshvutla@...com>
Subject: [PATCH v2] crypto: omap-sham: Add the offset of sg page to vaddr

kmap_atomic() gives only the page address of the input page.
Driver should take care of adding the offset of the scatterlist
within the page to the returned page address.
omap-sham driver is not adding the offset to page and directly operates
on the return vale of kmap_atomic(), because of which the following
error comes when running crypto tests:

00000000: d9 a1 1b 7c aa 90 3b aa 11 ab cb 25 00 b8 ac bf
[    2.338169] 00000010: c1 39 cd ff 48 d0 a8 e2 2b fa 33 a1
[    2.344008] alg: hash: Chunking test 1 failed for omap-sha256

So adding the scatterlist offset to vaddr.

Signed-off-by: Lokesh Vutla <lokeshvutla@...com>
---
- Tested on BBB. Logs below.
	Without this patch: http://pastebin.ubuntu.com/10722994/
	With this patch: http://pastebin.ubuntu.com/10722992/
 drivers/crypto/omap-sham.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index 21fd515..4d63e0d 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -640,6 +640,7 @@ static size_t omap_sham_append_sg(struct omap_sham_reqctx *ctx)
 
 	while (ctx->sg) {
 		vaddr = kmap_atomic(sg_page(ctx->sg));
+		vaddr += ctx->sg->offset;
 
 		count = omap_sham_append_buffer(ctx,
 				vaddr + ctx->offset,
-- 
1.9.1

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