[v2,-next] crypto: aspeed: fix type warnings

  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: use readb to avoid dereferencing the memory.

Signed-off-by: Neal Liu <neal_liu@aspeedtech.com>
---
Change since v1: keep iomem marker to remain its purpose.

 drivers/crypto/aspeed/aspeed-acry.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
  

On 2/1/2023 11:03 PM, Neal Liu wrote:
> 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: use readb to avoid dereferencing the memory.
> 
> Signed-off-by: Neal Liu <neal_liu@aspeedtech.com>
> ---
> Change since v1: keep iomem marker to remain its purpose.
> 
>   drivers/crypto/aspeed/aspeed-acry.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/crypto/aspeed/aspeed-acry.c b/drivers/crypto/aspeed/aspeed-acry.c
> index 164c524015f0..f2429e699d14 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;

All callers are passing acry_dev->buf_addr as buf, can just change that 
type to __le32 * and deref here directly?

>   	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 __iomem *sram_buffer = (u8 __iomem *)acry_dev->acry_sram;

u8 cast seems unnecessary, readb takes (void *) and using "+ data_idx"
offset below anyway.


>   	struct scatterlist *out_sg = req->dst;
>   	static u8 dram_buffer[ASPEED_ACRY_SRAM_MAX_LEN];
>   	int leading_zero = 1;
> @@ -321,11 +321,11 @@ static int aspeed_acry_rsa_transfer(struct aspeed_acry_dev *acry_dev)
>   
>   	for (j = ASPEED_ACRY_SRAM_MAX_LEN - 1; j >= 0; j--) {
>   		data_idx = acry_dev->data_byte_mapping[j];
> -		if (sram_buffer[data_idx] == 0 && leading_zero) {
> +		if (readb(sram_buffer + data_idx) == 0 && leading_zero) {
>   			result_nbytes--;
>   		} else {
>   			leading_zero = 0;
> -			dram_buffer[i] = sram_buffer[data_idx];
> +			dram_buffer[i] = readb(sram_buffer + data_idx);
>   			i++;
>   		}
>   	}
  

On Thu, Feb 02, 2023 at 05:36:05PM -0800, Dhananjay Phadke wrote:
>
> > diff --git a/drivers/crypto/aspeed/aspeed-acry.c b/drivers/crypto/aspeed/aspeed-acry.c
> > index 164c524015f0..f2429e699d14 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;
> 
> All callers are passing acry_dev->buf_addr as buf, can just change that type
> to __le32 * and deref here directly?

As buf is already void *, the cast can simply be removed.
> 
> >   	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 __iomem *sram_buffer = (u8 __iomem *)acry_dev->acry_sram;
> 
> u8 cast seems unnecessary, readb takes (void *) and using "+ data_idx"
> offset below anyway.

Either way a cast is unnecessary as (void __iomem *) converts to
(u8 __iomem *) just fine.

Thanks,
  

> > > diff --git a/drivers/crypto/aspeed/aspeed-acry.c
> > > b/drivers/crypto/aspeed/aspeed-acry.c
> > > index 164c524015f0..f2429e699d14 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;
> >
> > All callers are passing acry_dev->buf_addr as buf, can just change
> > that type to __le32 * and deref here directly?
> 
> As buf is already void *, the cast can simply be removed.

I'll just remove the cast. Thanks for your suggestion.

> >
> > >   	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 __iomem *sram_buffer = (u8 __iomem *)acry_dev->acry_sram;
> >
> > u8 cast seems unnecessary, readb takes (void *) and using "+ data_idx"
> > offset below anyway.
> 
> Either way a cast is unnecessary as (void __iomem *) converts to
> (u8 __iomem *) just fine.

I'll just remove the cast too.

-Neal