[RESEND,v2,9/9] ath5k: Constify ioreadX() iomem argument (as in generic implementation)
Commit Message
The ioreadX() helpers have inconsistent interface. On some architectures
void *__iomem address argument is a pointer to const, on some not.
Implementations of ioreadX() do not modify the memory under the address
so they can be converted to a "const" version for const-safety and
consistency among architectures.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Kalle Valo <kvalo@codeaurora.org>
---
drivers/net/wireless/ath/ath5k/ahb.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
Comments
On 19. 02. 20, 18:50, Krzysztof Kozlowski wrote:
> The ioreadX() helpers have inconsistent interface. On some architectures
> void *__iomem address argument is a pointer to const, on some not.
>
> Implementations of ioreadX() do not modify the memory under the address
> so they can be converted to a "const" version for const-safety and
> consistency among architectures.
>
> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
> Acked-by: Kalle Valo <kvalo@codeaurora.org>
> ---
> drivers/net/wireless/ath/ath5k/ahb.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath5k/ahb.c b/drivers/net/wireless/ath/ath5k/ahb.c
> index 2c9cec8b53d9..8bd01df369fb 100644
> --- a/drivers/net/wireless/ath/ath5k/ahb.c
> +++ b/drivers/net/wireless/ath/ath5k/ahb.c
> @@ -138,18 +138,18 @@ static int ath_ahb_probe(struct platform_device *pdev)
>
> if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
> /* Enable WMAC AHB arbitration */
> - reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
> + reg = ioread32((const void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
While I understand why the parameter of ioread32 should be const, I
don't see a reason for these casts on the users' side. What does it
bring except longer code to read?
thanks,
On Thu, Feb 20, 2020 at 10:48:33AM +0100, Jiri Slaby wrote:
> On 19. 02. 20, 18:50, Krzysztof Kozlowski wrote:
> > The ioreadX() helpers have inconsistent interface. On some architectures
> > void *__iomem address argument is a pointer to const, on some not.
> >
> > Implementations of ioreadX() do not modify the memory under the address
> > so they can be converted to a "const" version for const-safety and
> > consistency among architectures.
> >
> > Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
> > Acked-by: Kalle Valo <kvalo@codeaurora.org>
> > ---
> > drivers/net/wireless/ath/ath5k/ahb.c | 10 +++++-----
> > 1 file changed, 5 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/net/wireless/ath/ath5k/ahb.c b/drivers/net/wireless/ath/ath5k/ahb.c
> > index 2c9cec8b53d9..8bd01df369fb 100644
> > --- a/drivers/net/wireless/ath/ath5k/ahb.c
> > +++ b/drivers/net/wireless/ath/ath5k/ahb.c
> > @@ -138,18 +138,18 @@ static int ath_ahb_probe(struct platform_device *pdev)
> >
> > if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
> > /* Enable WMAC AHB arbitration */
> > - reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
> > + reg = ioread32((const void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
>
> While I understand why the parameter of ioread32 should be const, I
> don't see a reason for these casts on the users' side. What does it
> bring except longer code to read?
Because the argument is an int:
drivers/net/wireless/ath/ath5k/ahb.c: In function ‘ath_ahb_probe’:
drivers/net/wireless/ath/ath5k/ahb.c:141:18: warning: passing argument 1 of ‘ioread32’ makes pointer from integer without a cast [-Wint-conversion]
reg = ioread32(AR5K_AR2315_AHB_ARB_CTL);
Best regards,
Krzysztof
@@ -138,18 +138,18 @@ static int ath_ahb_probe(struct platform_device *pdev)
if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
/* Enable WMAC AHB arbitration */
- reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
+ reg = ioread32((const void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
/* Enable global WMAC swapping */
- reg = ioread32((void __iomem *) AR5K_AR2315_BYTESWAP);
+ reg = ioread32((const void __iomem *) AR5K_AR2315_BYTESWAP);
reg |= AR5K_AR2315_BYTESWAP_WMAC;
iowrite32(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
} else {
/* Enable WMAC DMA access (assuming 5312 or 231x*/
/* TODO: check other platforms */
- reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
+ reg = ioread32((const void __iomem *) AR5K_AR5312_ENABLE);
if (to_platform_device(ah->dev)->id == 0)
reg |= AR5K_AR5312_ENABLE_WLAN0;
else
@@ -202,12 +202,12 @@ static int ath_ahb_remove(struct platform_device *pdev)
if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
/* Disable WMAC AHB arbitration */
- reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
+ reg = ioread32((const void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
} else {
/*Stop DMA access */
- reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
+ reg = ioread32((const void __iomem *) AR5K_AR5312_ENABLE);
if (to_platform_device(ah->dev)->id == 0)
reg &= ~AR5K_AR5312_ENABLE_WLAN0;
else