[PATCH 2/6] crypto: sahara: Fix error check for dma_map_sg

[Jack Wang]

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@xxxxxxxxxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: linux-crypto@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Fixes: 5de8875281e1 ("crypto: sahara - Add driver for SAHARA2 accelerator.")
Signed-off-by: Jack Wang <jinpu.wang@xxxxxxxxx>
---
 drivers/crypto/sahara.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/sahara.c b/drivers/crypto/sahara.c
index 457084b344c1..bb71aac30e2c 100644
--- 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;
 	}
-- 
2.34.1