Merge tag 'libnvdimm-fixes-5.0-rc3' of git://git.kernel.org/pub/scm/linux/kernel...

[linux-2.6-microblaze.git] / drivers / crypto / caam / caamhash.c

diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c
index 81712aa..bb1a2cd 100644 (file)
--- 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);