[PATCH 5/6] crypto: allwinner: Fix dma_map_sg error check

[Jack Wang]

dma_map_sg return 0 on error.

Cc: Corentin Labbe <clabbe.montjoie@xxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Chen-Yu Tsai <wens@xxxxxxxx>
Cc: Jernej Skrabec <jernej.skrabec@xxxxxxxxx>
Cc: Samuel Holland <samuel@xxxxxxxxxxxx>
Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Cc: Minghao Chi <chi.minghao@xxxxxxxxxx>
Cc: Peng Wu <wupeng58@xxxxxxxxxx>
Cc: Alexey Khoroshilov <khoroshilov@xxxxxxxxx>
Cc: linux-crypto@xxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-sunxi@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Fixes: 06f751b61329 ("crypto: allwinner - Add sun8i-ce Crypto Engine")
Fixes: d9b45418a917 ("crypto: sun8i-ss - support hash algorithms")
Signed-off-by: Jack Wang <jinpu.wang@xxxxxxxxx>
---
 drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c | 6 +++---
 drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c   | 2 +-
 drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c | 4 ++--
 drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c   | 2 +-
 4 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
index 74b4e910a38d..be7f46faef7e 100644
--- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
+++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
@@ -208,7 +208,7 @@ static int sun8i_ce_cipher_prepare(struct crypto_engine *engine, void *async_req
 
 	if (areq->src == areq->dst) {
 		nr_sgs = dma_map_sg(ce->dev, areq->src, ns, DMA_BIDIRECTIONAL);
-		if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
+		if (!nr_sgs || nr_sgs > MAX_SG) {
 			dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
 			err = -EINVAL;
 			goto theend_iv;
@@ -216,13 +216,13 @@ static int sun8i_ce_cipher_prepare(struct crypto_engine *engine, void *async_req
 		nr_sgd = nr_sgs;
 	} else {
 		nr_sgs = dma_map_sg(ce->dev, areq->src, ns, DMA_TO_DEVICE);
-		if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
+		if (!nr_sgs || nr_sgs > MAX_SG) {
 			dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
 			err = -EINVAL;
 			goto theend_iv;
 		}
 		nr_sgd = dma_map_sg(ce->dev, areq->dst, nd, DMA_FROM_DEVICE);
-		if (nr_sgd <= 0 || nr_sgd > MAX_SG) {
+		if (!nr_sgd || nr_sgd > MAX_SG) {
 			dev_err(ce->dev, "Invalid sg number %d\n", nr_sgd);
 			err = -EINVAL;
 			goto theend_sgs;
diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c
index 8b5b9b9d04c3..0e6843ec197f 100644
--- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c
+++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-hash.c
@@ -389,7 +389,7 @@ int sun8i_ce_hash_run(struct crypto_engine *engine, void *breq)
 	cet->t_asym_ctl = 0;
 
 	nr_sgs = dma_map_sg(ce->dev, areq->src, ns, DMA_TO_DEVICE);
-	if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
+	if (!nr_sgs || nr_sgs > MAX_SG) {
 		dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
 		err = -EINVAL;
 		goto theend;
diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
index 910d6751644c..fdcc98cdecaa 100644
--- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
+++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
@@ -232,13 +232,13 @@ static int sun8i_ss_cipher(struct skcipher_request *areq)
 		nr_sgd = nr_sgs;
 	} else {
 		nr_sgs = dma_map_sg(ss->dev, areq->src, nsgs, DMA_TO_DEVICE);
-		if (nr_sgs <= 0 || nr_sgs > 8) {
+		if (!nr_sgs || nr_sgs > 8) {
 			dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs);
 			err = -EINVAL;
 			goto theend_iv;
 		}
 		nr_sgd = dma_map_sg(ss->dev, areq->dst, nsgd, DMA_FROM_DEVICE);
-		if (nr_sgd <= 0 || nr_sgd > 8) {
+		if (!nr_sgd || nr_sgd > 8) {
 			dev_err(ss->dev, "Invalid sg number %d\n", nr_sgd);
 			err = -EINVAL;
 			goto theend_sgs;
diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
index 36a82b22953c..fcb8c41cc957 100644
--- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
+++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-hash.c
@@ -527,7 +527,7 @@ int sun8i_ss_hash_run(struct crypto_engine *engine, void *breq)
 	rctx->method = ss->variant->alg_hash[algt->ss_algo_id];
 
 	nr_sgs = dma_map_sg(ss->dev, areq->src, sg_nents(areq->src), DMA_TO_DEVICE);
-	if (nr_sgs <= 0 || nr_sgs > MAX_SG) {
+	if (!nr_sgs || nr_sgs > MAX_SG) {
 		dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs);
 		err = -EINVAL;
 		goto theend;
-- 
2.34.1