linux-kernel - [PATCH v2] net: smc91x: Fix pointer types

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Date: Thu, 16 May 2024 17:56:12 +0200
From: Thorsten Blum <thorsten.blum@...lux.com>
To: thorsten.blum@...lux.com
Cc: andrew@...n.ch,
	arnd@...db.de,
	davem@...emloft.net,
	edumazet@...gle.com,
	glaubitz@...sik.fu-berlin.de,
	kuba@...nel.org,
	linux-kernel@...r.kernel.org,
	lkp@...el.com,
	netdev@...r.kernel.org,
	nico@...xnic.net,
	pabeni@...hat.com
Subject: [PATCH v2] net: smc91x: Fix pointer types

Use void __iomem pointers as parameters for mcf_insw() and mcf_outsw()
to align with the parameter types of readw() and writew().

Use lp->base instead of ioaddr when calling SMC_outsw(), SMC_outsb(),
SMC_insw(), and SMC_insb() to retain its type across macro boundaries
and to fix the following warnings reported by kernel test robot:

drivers/net/ethernet/smsc/smc91x.c:590:9: sparse: warning: incorrect type in argument 1 (different address spaces)
drivers/net/ethernet/smsc/smc91x.c:590:9: sparse:    expected void *a
drivers/net/ethernet/smsc/smc91x.c:590:9: sparse:    got void [noderef] __iomem *
drivers/net/ethernet/smsc/smc91x.c:590:9: sparse: warning: incorrect type in argument 1 (different address spaces)
drivers/net/ethernet/smsc/smc91x.c:590:9: sparse:    expected void *a
drivers/net/ethernet/smsc/smc91x.c:590:9: sparse:    got void [noderef] __iomem *
drivers/net/ethernet/smsc/smc91x.c:590:9: sparse: warning: incorrect type in argument 1 (different address spaces)
drivers/net/ethernet/smsc/smc91x.c:590:9: sparse:    expected void *a
drivers/net/ethernet/smsc/smc91x.c:590:9: sparse:    got void [noderef] __iomem *
drivers/net/ethernet/smsc/smc91x.c:483:17: sparse: warning: incorrect type in argument 1 (different address spaces)
drivers/net/ethernet/smsc/smc91x.c:483:17: sparse:    expected void *a
drivers/net/ethernet/smsc/smc91x.c:483:17: sparse:    got void [noderef] __iomem *

Signed-off-by: Thorsten Blum <thorsten.blum@...lux.com>
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202405160853.3qyaSj8w-lkp@intel.com/
Acked-by: Nicolas Pitre <nico@...xnic.net>
---
Changes in v2:
- Use lp->base instead of __ioaddr as suggested by Andrew Lunn. They are
  essentially the same, but using lp->base results in a smaller diff
- Remove whitespace only changes as suggested by Andrew Lunn
- Preserve Acked-by: Nicolas Pitre tag (please let me know if you
  somehow disagree with the changes in v2)
---
 drivers/net/ethernet/smsc/smc91x.h | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/smsc/smc91x.h b/drivers/net/ethernet/smsc/smc91x.h
index 45ef5ac0788a..a1523fb503a3 100644
--- a/drivers/net/ethernet/smsc/smc91x.h
+++ b/drivers/net/ethernet/smsc/smc91x.h
@@ -142,14 +142,14 @@ static inline void _SMC_outw_align4(u16 val, void __iomem *ioaddr, int reg,
 #define SMC_CAN_USE_32BIT	0
 #define SMC_NOWAIT		1
 
-static inline void mcf_insw(void *a, unsigned char *p, int l)
+static inline void mcf_insw(void __iomem *a, unsigned char *p, int l)
 {
 	u16 *wp = (u16 *) p;
 	while (l-- > 0)
 		*wp++ = readw(a);
 }
 
-static inline void mcf_outsw(void *a, unsigned char *p, int l)
+static inline void mcf_outsw(void __iomem *a, unsigned char *p, int l)
 {
 	u16 *wp = (u16 *) p;
 	while (l-- > 0)
@@ -1034,7 +1034,7 @@ static const char * chip_ids[ 16 ] =  {
 			void __iomem *__ioaddr = ioaddr;		\
 			if (__len >= 2 && (unsigned long)__ptr & 2) {	\
 				__len -= 2;				\
-				SMC_outsw(ioaddr, DATA_REG(lp), __ptr, 1); \
+				SMC_outsw(lp->base, DATA_REG(lp), __ptr, 1); \
 				__ptr += 2;				\
 			}						\
 			if (SMC_CAN_USE_DATACS && lp->datacs)		\
@@ -1042,12 +1042,12 @@ static const char * chip_ids[ 16 ] =  {
 			SMC_outsl(__ioaddr, DATA_REG(lp), __ptr, __len>>2); \
 			if (__len & 2) {				\
 				__ptr += (__len & ~3);			\
-				SMC_outsw(ioaddr, DATA_REG(lp), __ptr, 1); \
+				SMC_outsw(lp->base, DATA_REG(lp), __ptr, 1); \
 			}						\
 		} else if (SMC_16BIT(lp))				\
-			SMC_outsw(ioaddr, DATA_REG(lp), p, (l) >> 1);	\
+			SMC_outsw(lp->base, DATA_REG(lp), p, (l) >> 1);	\
 		else if (SMC_8BIT(lp))				\
-			SMC_outsb(ioaddr, DATA_REG(lp), p, l);	\
+			SMC_outsb(lp->base, DATA_REG(lp), p, l);	\
 	} while (0)
 
 #define SMC_PULL_DATA(lp, p, l)					\
@@ -1080,9 +1080,9 @@ static const char * chip_ids[ 16 ] =  {
 			__len += 2;					\
 			SMC_insl(__ioaddr, DATA_REG(lp), __ptr, __len>>2); \
 		} else if (SMC_16BIT(lp))				\
-			SMC_insw(ioaddr, DATA_REG(lp), p, (l) >> 1);	\
+			SMC_insw(lp->base, DATA_REG(lp), p, (l) >> 1);	\
 		else if (SMC_8BIT(lp))				\
-			SMC_insb(ioaddr, DATA_REG(lp), p, l);		\
+			SMC_insb(lp->base, DATA_REG(lp), p, l);		\
 	} while (0)
 
 #endif  /* _SMC91X_H_ */
-- 
2.45.0