1 files changed, 9 insertions, 6 deletions

diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c
index 81712aa5d0f2..bb1a2cdf1951 100644
--- a/drivers/crypto/caam/caamhash.c
+++ b/drivers/crypto/caam/caamhash.c
@@ -1072,13 +1072,16 @@ static int ahash_final_no_ctx(struct ahash_request *req)
 
         desc = edesc->hw_desc;
 
-        state->buf_dma = dma_map_single(jrdev, buf, buflen, DMA_TO_DEVICE);
-        if (dma_mapping_error(jrdev, state->buf_dma)) {
-                dev_err(jrdev, "unable to map src\n");
-                goto unmap;
-        }
+        if (buflen) {
+                state->buf_dma = dma_map_single(jrdev, buf, buflen,
+                                                DMA_TO_DEVICE);
+                if (dma_mapping_error(jrdev, state->buf_dma)) {
+                        dev_err(jrdev, "unable to map src\n");
+                        goto unmap;
+                }
 
-        append_seq_in_ptr(desc, state->buf_dma, buflen, 0);
+                append_seq_in_ptr(desc, state->buf_dma, buflen, 0);
+        }
 
         edesc->dst_dma = map_seq_out_ptr_result(desc, jrdev, req->result,
                                                 digestsize);