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authorSean Anderson <sean.anderson@seco.com>2021-07-01 21:56:37 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2021-07-16 10:49:32 +0300
commitdf6313d707e575a679ada3313358289af24454c0 (patch)
tree43f25e7edd650024b3fec1daf8cec5e798e909a5 /drivers/crypto
parent5261cdf457ce3635bf18d393a3c1991dcfaf9d02 (diff)
downloadlinux-df6313d707e575a679ada3313358289af24454c0.tar.xz
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@seco.com> Reviewed-by: Richard Weinberger <richard@nod.at> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
-rw-r--r--drivers/crypto/mxs-dcp.c45
1 files 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;
+
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;
}