crypto: marvell/cesa - Avoid empty transfer descriptor

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>

diff --git a/drivers/crypto/marvell/cesa/hash.c b/drivers/crypto/marvell/cesa/hash.c
index f150861ceaf6957c12c359dbf6279948ec836f9f..6815eddc9068124a6249391d7325ef51ed6c60d9 100644 (file)
--- a/drivers/crypto/marvell/cesa/hash.c
+++ b/drivers/crypto/marvell/cesa/hash.c
@@ -663,7 +663,7 @@ 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