[PATCH v2] crypto: omap-sham: kmap SG pages before appending

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HIGHMEM pages may not be mapped so we must kmap them before accessing.
This resolves a random OOPs error that was showing up during OpenSSL SHA tests.

Signed-off-by: Joel Fernandes <joelf@xxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
---
v2 changes:
	- don't check for HIGHMEM, kmap/kunmap do them anyway (Thanks Herbert).

 drivers/crypto/omap-sham.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
index e45aaaf..207eac1 100644
--- a/drivers/crypto/omap-sham.c
+++ b/drivers/crypto/omap-sham.c
@@ -636,11 +636,17 @@ static size_t omap_sham_append_buffer(struct omap_sham_reqctx *ctx,
 static size_t omap_sham_append_sg(struct omap_sham_reqctx *ctx)
 {
 	size_t count;
+	const u8 *vaddr;
 
 	while (ctx->sg) {
+		vaddr = kmap(sg_page(ctx->sg));
+
 		count = omap_sham_append_buffer(ctx,
-				sg_virt(ctx->sg) + ctx->offset,
+				vaddr + ctx->offset,
 				ctx->sg->length - ctx->offset);
+
+		kunmap((void *)vaddr);
+
 		if (!count)
 			break;
 		ctx->offset += count;
-- 
1.7.9.5

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