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arm64: spinlock: Fix theoretical trylock() A-B-A with LSE atomics

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If the spinlock "next" ticket wraps around between the initial LDR
and the cmpxchg in the LSE version of spin_trylock, then we can erroneously
think that we have successfuly acquired the lock because we only check
whether the next ticket return by the cmpxchg is equal to the owner ticket
in our updated lock word.

This patch fixes the issue by performing a full 32-bit check of the lock
word when trying to determine whether or not the CASA instruction updated
memory.

Reported-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Will Deacon 2018-01-31 12:12:20 +00:00 committed by Catalin Marinas
parent ec89ab50a0
commit 202fb4ef81
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/include/asm/spinlock.h
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@ -87,8 +87,8 @@ static inline int arch_spin_trylock(arch_spinlock_t *lock)
" cbnz %w1, 1f\n"
" add %w1, %w0, %3\n"
" casa %w0, %w1, %2\n"
" and %w1, %w1, #0xffff\n"
" eor %w1, %w1, %w0, lsr #16\n"
" sub %w1, %w1, %3\n"
" eor %w1, %w1, %w0\n"
"1:")
: "=&r" (lockval), "=&r" (tmp), "+Q" (*lock)
: "I" (1 << TICKET_SHIFT)