[PATCH 4/6] crypto: amlogic: Fix dma_map_sg error check

[Jack Wang]

dma_map_sg return 0 on error.

Cc: Corentin Labbe <clabbe@xxxxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: linux-crypto@xxxxxxxxxxxxxxx
Cc: linux-amlogic@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Fixes: 48fe583fe541 ("crypto: amlogic - Add crypto accelerator for amlogic GXL")
Signed-off-by: Jack Wang <jinpu.wang@xxxxxxxxx>
---
 drivers/crypto/amlogic/amlogic-gxl-cipher.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/amlogic/amlogic-gxl-cipher.c b/drivers/crypto/amlogic/amlogic-gxl-cipher.c
index e79514fce731..af017a087ebf 100644
--- a/drivers/crypto/amlogic/amlogic-gxl-cipher.c
+++ b/drivers/crypto/amlogic/amlogic-gxl-cipher.c
@@ -177,7 +177,7 @@ static int meson_cipher(struct skcipher_request *areq)
 	if (areq->src == areq->dst) {
 		nr_sgs = dma_map_sg(mc->dev, areq->src, sg_nents(areq->src),
 				    DMA_BIDIRECTIONAL);
-		if (nr_sgs < 0) {
+		if (!nr_sgs) {
 			dev_err(mc->dev, "Invalid SG count %d\n", nr_sgs);
 			err = -EINVAL;
 			goto theend;
@@ -186,14 +186,14 @@ static int meson_cipher(struct skcipher_request *areq)
 	} else {
 		nr_sgs = dma_map_sg(mc->dev, areq->src, sg_nents(areq->src),
 				    DMA_TO_DEVICE);
-		if (nr_sgs < 0 || nr_sgs > MAXDESC - 3) {
+		if (!nr_sgs || nr_sgs > MAXDESC - 3) {
 			dev_err(mc->dev, "Invalid SG count %d\n", nr_sgs);
 			err = -EINVAL;
 			goto theend;
 		}
 		nr_sgd = dma_map_sg(mc->dev, areq->dst, sg_nents(areq->dst),
 				    DMA_FROM_DEVICE);
-		if (nr_sgd < 0 || nr_sgd > MAXDESC - 3) {
+		if (!nr_sgd || nr_sgd > MAXDESC - 3) {
 			dev_err(mc->dev, "Invalid SG count %d\n", nr_sgd);
 			err = -EINVAL;
 			goto theend;
-- 
2.34.1