From: Antoine Ténart <antoine.tenart@free-electrons.com>
Date: Thu, 1 Jun 2017 19:38:56 +0000 (+0200)
Subject: crypto: sun4i-ss - cannot use DMA is the request is 0 length
X-Git-Tag: v4.14-rc1~453^2~56
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0f52ddaed6500d0b74fcaf5568726068d385129f;p=platform%2Fkernel%2Flinux-rpi.git

crypto: sun4i-ss - cannot use DMA is the request is 0 length

Do not use DMA is the request is 0 length.

Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Tested-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Acked-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/drivers/crypto/sunxi-ss/sun4i-ss-hash.c b/drivers/crypto/sunxi-ss/sun4i-ss-hash.c
index e53c312..bc3cbde 100644
--- a/drivers/crypto/sunxi-ss/sun4i-ss-hash.c
+++ b/drivers/crypto/sunxi-ss/sun4i-ss-hash.c
@@ -250,7 +250,7 @@ static int sun4i_hash(struct ahash_request *areq)
 			i = 0;
 		in_sg = sg_next(in_sg);
 	}
-	if (i == 1 && !op->len)
+	if (i == 1 && !op->len && areq->nbytes)
 		dev_dbg(ss->dev, "We can DMA\n");
 
 	i = 0;