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

[Herbert Xu]

On Thu, Aug 25, 2022 at 09:24:20AM +0200, Jack Wang wrote:
> 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) {

This is also less robust than the original code and I'll be
reverting it.

Thanks,
-- 
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt