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mips/mmiowb: Add unconditional mmiowb() to arch_spin_unlock()

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The mmiowb() macro is horribly difficult to use and drivers will continue
to work most of the time if they omit a call when it is required.

Rather than rely on driver authors getting this right, push mmiowb() into
arch_spin_unlock() for mips. If this is deemed to be a performance issue,
a subsequent optimisation could make use of ARCH_HAS_MMIOWB to elide
the barrier in cases where no I/O writes were performed inside the
critical section.

Acked-by: Paul Burton <paul.burton@mips.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2019-02-22 13:37:21 +00:00
parent e9e8543fec
commit 346e91ee09
4 changed files with 26 additions and 4 deletions
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3
arch/mips/include/asm/io.h
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@ -102,9 +102,6 @@ static inline void set_io_port_base(unsigned long base)
#define iobarrier_w() wmb()
#define iobarrier_sync() iob()
/* Some callers use this older API instead. */
#define mmiowb() iobarrier_w()
/*
* virt_to_phys - map virtual addresses to physical
* @address: address to remap