| Message ID | 20230202025600.2598548-1-neal_liu@aspeedtech.com |
|---|---|
| State | New |
| Headers | show |
| Series | [PATCH-next] crypto: aspeed: fix type warnings | expand |
On Thu, Feb 02, 2023 at 10:56:00AM +0800, Neal Liu wrote: > > @@ -302,7 +302,7 @@ static int aspeed_acry_rsa_ctx_copy(struct aspeed_acry_dev *acry_dev, void *buf, > static int aspeed_acry_rsa_transfer(struct aspeed_acry_dev *acry_dev) > { > struct akcipher_request *req = acry_dev->req; > - u8 *sram_buffer = (u8 *)acry_dev->acry_sram; > + u8 *sram_buffer = (u8 __force *)acry_dev->acry_sram; Wouldn't it be better to keep the iomem marker and then use readb on sram_buffer? Cheers,
On Thu, Feb 02, 2023 at 03:23:29AM +0000, Neal Liu wrote: > > I cannot tell which way is better. Do you prefer to keep the iomem marker? The whole point of iomem is to prevent you from directly dereferencing that memory. So casting it away to remove the warning simply defeats its purpose. If you're worried about the overhead of readb perhaps you can look into readb_relaxed after considering the effects of the barriers. Cheers,
diff --git a/drivers/crypto/aspeed/aspeed-acry.c b/drivers/crypto/aspeed/aspeed-acry.c index 164c524015f0..f8c733376469 100644 --- a/drivers/crypto/aspeed/aspeed-acry.c +++ b/drivers/crypto/aspeed/aspeed-acry.c @@ -252,7 +252,7 @@ static int aspeed_acry_rsa_ctx_copy(struct aspeed_acry_dev *acry_dev, void *buf, enum aspeed_rsa_key_mode mode) { const u8 *src = xbuf; - u32 *dw_buf = (u32 *)buf; + __le32 *dw_buf = (__le32 *)buf; int nbits, ndw; int i, j, idx; u32 data = 0; @@ -302,7 +302,7 @@ static int aspeed_acry_rsa_ctx_copy(struct aspeed_acry_dev *acry_dev, void *buf, static int aspeed_acry_rsa_transfer(struct aspeed_acry_dev *acry_dev) { struct akcipher_request *req = acry_dev->req; - u8 *sram_buffer = (u8 *)acry_dev->acry_sram; + u8 *sram_buffer = (u8 __force *)acry_dev->acry_sram; struct scatterlist *out_sg = req->dst; static u8 dram_buffer[ASPEED_ACRY_SRAM_MAX_LEN]; int leading_zero = 1;
This patch fixes following warnings: 1. sparse: incorrect type in assignment (different base types) Fix: change to __le32 type. 2. sparse: cast removes address space '__iomem' of expression Fix: change to force cast. Signed-off-by: Neal Liu <neal_liu@aspeedtech.com> --- drivers/crypto/aspeed/aspeed-acry.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)