crypto: marvell/cesa - Avoid empty transfer descriptor

[ Upstream commit 1bafd82d9a40cf09c6c40f1c09cc35b7050b1a9f ]

The user may set req->src even if req->nbytes == 0.  If there
is no data to hash from req->src, do not generate an empty TDMA
descriptor.

Fixes: db509a45339f ("crypto: marvell/cesa - add TDMA support")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/crypto/marvell/cesa/hash.c b/drivers/crypto/marvell/cesa/hash.c
index 8441c3198d460cac7f4964b3bb1da630c79a0670..823a8fb114bbbb1a795a06a14cca96ffa8472202 100644 (file)
--- a/drivers/crypto/marvell/cesa/hash.c
+++ b/drivers/crypto/marvell/cesa/hash.c
@@ -639,7 +639,7 @@ static int mv_cesa_ahash_dma_req_init(struct ahash_request *req)
        if (ret)
                goto err_free_tdma;
 
-       if (iter.src.sg) {
+       if (iter.base.len > iter.src.op_offset) {
                /*
                 * Add all the new data, inserting an operation block and
                 * launch command between each full SRAM block-worth of