Re: crypto: ccp: use dma_mapping_error to check map error

From: Gary R Hook
Date: Tue Aug 08 2017 - 11:27:48 EST


On 08/08/2017 08:42 AM, Pan Bian wrote:
The return value of dma_map_single() should be checked by
dma_mapping_error(). However, in function ccp_init_dm_workarea(), its
return value is checked against NULL, which could result in failures.

Signed-off-by: Pan Bian <bianpan2016@xxxxxxx>

Acked-by: Gary R Hook <gary.hook@xxxxxxx>

---
drivers/crypto/ccp/ccp-ops.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c
index c0dfdac..ca83d19 100644
--- a/drivers/crypto/ccp/ccp-ops.c
+++ b/drivers/crypto/ccp/ccp-ops.c
@@ -168,7 +168,7 @@ static int ccp_init_dm_workarea(struct ccp_dm_workarea *wa,

wa->dma.address = dma_map_single(wa->dev, wa->address, len,
dir);
- if (!wa->dma.address)
+ if (dma_mapping_error(wa->dev, wa->dma.address))
return -ENOMEM;

wa->dma.length = len;