crypto: sahara - Fix error check for dma_map_sg

dma_map_sg return 0 on error, it returns the number of
DMA address segments mapped (this may be shorter
than <nents> passed in if some elements of the scatter/gather
list are physically or virtually adjacent and an IOMMU maps
them with a single entry).

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/sahara.c b/drivers/crypto/sahara.c
index b07ae4b..7ab20fb 100644 (file)
--- a/drivers/crypto/sahara.c
+++ b/drivers/crypto/sahara.c
@@ -487,13 +487,13 @@ static int sahara_hw_descriptor_create(struct sahara_dev *dev)
 
        ret = dma_map_sg(dev->device, dev->in_sg, dev->nb_in_sg,
                         DMA_TO_DEVICE);
-       if (ret != dev->nb_in_sg) {
+       if (!ret) {
                dev_err(dev->device, "couldn't map in sg\n");
                goto unmap_in;
        }
        ret = dma_map_sg(dev->device, dev->out_sg, dev->nb_out_sg,
                         DMA_FROM_DEVICE);
-       if (ret != dev->nb_out_sg) {
+       if (!ret) {
                dev_err(dev->device, "couldn't map out sg\n");
                goto unmap_out;
        }