diff options
| author | Paul Burton <paul.burton@mips.com> | 2018-07-27 18:23:19 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-19 22:47:14 +0200 |
| commit | 65d84b6071408959be9204f2750d3b0867209a05 (patch) | |
| tree | b2b16929d185a92c99cea9eeaadc1c52ae14d3af | |
| parent | 38fb233a47f5016f996c53ebb90f7525b5eaaddf (diff) | |
MIPS: Fix ISA virt/bus conversion for non-zero PHYS_OFFSET
[ Upstream commit 0494d7ffdcebc6935410ea0719b24ab626675351 ]
isa_virt_to_bus() & isa_bus_to_virt() claim to treat ISA bus addresses
as being identical to physical addresses, but they fail to do so in the
presence of a non-zero PHYS_OFFSET.
Correct this by having them use virt_to_phys() & phys_to_virt(), which
consolidates the calculations to one place & ensures that ISA bus
addresses do indeed match physical addresses.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20047/
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: Vladimir Kondratiev <vladimir.kondratiev@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/mips/include/asm/io.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h index 853b2f4954fa..06049b6b3ddd 100644 --- a/arch/mips/include/asm/io.h +++ b/arch/mips/include/asm/io.h @@ -141,14 +141,14 @@ static inline void * phys_to_virt(unsigned long address) /* * ISA I/O bus memory addresses are 1:1 with the physical address. */ -static inline unsigned long isa_virt_to_bus(volatile void * address) +static inline unsigned long isa_virt_to_bus(volatile void *address) { - return (unsigned long)address - PAGE_OFFSET; + return virt_to_phys(address); } -static inline void * isa_bus_to_virt(unsigned long address) +static inline void *isa_bus_to_virt(unsigned long address) { - return (void *)(address + PAGE_OFFSET); + return phys_to_virt(address); } #define isa_page_to_bus page_to_phys |