----- Ursprüngliche Mail -----
> Von: "Sean Anderson" <sean.anderson@xxxxxxxx>
> An: "Linux Crypto Mailing List" <linux-crypto@xxxxxxxxxxxxxxx>, "Herbert Xu" <herbert@xxxxxxxxxxxxxxxxxxx>, "davem"
> <davem@xxxxxxxxxxxxx>
> CC: "horia geanta" <horia.geanta@xxxxxxx>, "aymen sghaier" <aymen.sghaier@xxxxxxx>, "richard" <richard@xxxxxx>,
> "linux-arm-kernel" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, "Marek Vasut" <marex@xxxxxxx>, "Sean Anderson"
> <sean.anderson@xxxxxxxx>
> Gesendet: Donnerstag, 1. Juli 2021 20:56:37
> Betreff: [PATCH v2 1/2] crypto: mxs-dcp: Check for DMA mapping errors
> After calling dma_map_single(), we must also call dma_mapping_error().
> This fixes the following warning when compiling with CONFIG_DMA_API_DEBUG:
>
> [ 311.241478] WARNING: CPU: 0 PID: 428 at kernel/dma/debug.c:1027
> check_unmap+0x79c/0x96c
> [ 311.249547] DMA-API: mxs-dcp 2280000.crypto: device driver failed to check
> map error[device address=0x00000000860cb080] [size=32 bytes] [mapped as single]
>
> Signed-off-by: Sean Anderson <sean.anderson@xxxxxxxx>
> ---
>
> (no changes since v1)
>
> drivers/crypto/mxs-dcp.c | 45 +++++++++++++++++++++++++++++++---------
> 1 file changed, 35 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/crypto/mxs-dcp.c b/drivers/crypto/mxs-dcp.c
> index d6a7784d2988..f397cc5bf102 100644
> --- a/drivers/crypto/mxs-dcp.c
> +++ b/drivers/crypto/mxs-dcp.c
> @@ -170,15 +170,19 @@ static struct dcp *global_sdcp;
>
> static int mxs_dcp_start_dma(struct dcp_async_ctx *actx)
> {
> + int dma_err;
> struct dcp *sdcp = global_sdcp;
> const int chan = actx->chan;
> uint32_t stat;
> unsigned long ret;
> struct dcp_dma_desc *desc = &sdcp->coh->desc[actx->chan];
> -
> dma_addr_t desc_phys = dma_map_single(sdcp->dev, desc, sizeof(*desc),
> DMA_TO_DEVICE);
>
> + dma_err = dma_mapping_error(sdcp->dev, desc_phys);
> + if (dma_err)
> + return dma_err;
> +
Minor nit, you don't need to propagate the return code from dma_mapping_error().
It just returns 0 for success and -ENOMEM on failure.
So treating it as boolean function is fine, IMHO and keeps the code simpler.
But it is a matter of taste. :-)
> reinit_completion(&sdcp->completion[chan]);
>
> /* Clear status register. */
> @@ -216,18 +220,29 @@ static int mxs_dcp_start_dma(struct dcp_async_ctx *actx)
> static int mxs_dcp_run_aes(struct dcp_async_ctx *actx,
> struct skcipher_request *req, int init)
> {
> + dma_addr_t key_phys, src_phys, dst_phys;
> struct dcp *sdcp = global_sdcp;
> struct dcp_dma_desc *desc = &sdcp->coh->desc[actx->chan];
> struct dcp_aes_req_ctx *rctx = skcipher_request_ctx(req);
> int ret;
>
> - dma_addr_t key_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_key,
> - 2 * AES_KEYSIZE_128,
> - DMA_TO_DEVICE);
> - dma_addr_t src_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_in_buf,
> - DCP_BUF_SZ, DMA_TO_DEVICE);
> - dma_addr_t dst_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_out_buf,
> - DCP_BUF_SZ, DMA_FROM_DEVICE);
> + key_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_key,
> + 2 * AES_KEYSIZE_128, DMA_TO_DEVICE);
> + ret = dma_mapping_error(sdcp->dev, key_phys);
> + if (ret)
> + return ret;
> +
> + src_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_in_buf,
> + DCP_BUF_SZ, DMA_TO_DEVICE);
> + ret = dma_mapping_error(sdcp->dev, src_phys);
> + if (ret)
> + goto err_src;
> +
> + dst_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_out_buf,
> + DCP_BUF_SZ, DMA_FROM_DEVICE);
> + ret = dma_mapping_error(sdcp->dev, dst_phys);
> + if (ret)
> + goto err_dst;
>
> if (actx->fill % AES_BLOCK_SIZE) {
> dev_err(sdcp->dev, "Invalid block size!\n");
> @@ -265,10 +280,12 @@ static int mxs_dcp_run_aes(struct dcp_async_ctx *actx,
> ret = mxs_dcp_start_dma(actx);
>
> aes_done_run:
> + dma_unmap_single(sdcp->dev, dst_phys, DCP_BUF_SZ, DMA_FROM_DEVICE);
> +err_dst:
> + dma_unmap_single(sdcp->dev, src_phys, DCP_BUF_SZ, DMA_TO_DEVICE);
> +err_src:
> dma_unmap_single(sdcp->dev, key_phys, 2 * AES_KEYSIZE_128,
> DMA_TO_DEVICE);
> - dma_unmap_single(sdcp->dev, src_phys, DCP_BUF_SZ, DMA_TO_DEVICE);
> - dma_unmap_single(sdcp->dev, dst_phys, DCP_BUF_SZ, DMA_FROM_DEVICE);
>
> return ret;
> }
> @@ -557,6 +574,10 @@ static int mxs_dcp_run_sha(struct ahash_request *req)
> dma_addr_t buf_phys = dma_map_single(sdcp->dev, sdcp->coh->sha_in_buf,
> DCP_BUF_SZ, DMA_TO_DEVICE);
>
> + ret = dma_mapping_error(sdcp->dev, buf_phys);
> + if (ret)
> + return ret;
> +
> /* Fill in the DMA descriptor. */
> desc->control0 = MXS_DCP_CONTROL0_DECR_SEMAPHORE |
> MXS_DCP_CONTROL0_INTERRUPT |
> @@ -589,6 +610,10 @@ static int mxs_dcp_run_sha(struct ahash_request *req)
> if (rctx->fini) {
> digest_phys = dma_map_single(sdcp->dev, sdcp->coh->sha_out_buf,
> DCP_SHA_PAY_SZ, DMA_FROM_DEVICE);
> + ret = dma_mapping_error(sdcp->dev, digest_phys);
> + if (ret)
> + goto done_run;
> +
> desc->control0 |= MXS_DCP_CONTROL0_HASH_TERM;
> desc->payload = digest_phys;
> }
Reviewed-by: Richard Weinberger <richard@xxxxxx>
Thanks,
//richard
