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s390/rwlock: add missing local_irq_restore calls 

The out of line _raw_read_lock_wait_flags/_raw_write_lock_wait_flags
functions for the arch_read_lock_flags/arch_write_lock_flags  calls
fail to re-enable the interrupts after another unsuccessful try to
get the lock with compare-and-swap. The following wait would be
done with interrupts disabled which is suboptimal.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2014-05-16 09:35:02 +02:00
parent bae8f56734
commit 939c5ae402
1 changed files with 2 additions and 0 deletions
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2
arch/s390/lib/spinlock.c
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@ -143,6 +143,7 @@ void _raw_read_lock_wait_flags(arch_rwlock_t *rw, unsigned long flags)
local_irq_disable();
if (_raw_compare_and_swap(&rw->lock, old, old + 1))
return;
local_irq_restore(flags);
}
}
EXPORT_SYMBOL(_raw_read_lock_wait_flags);
@ -199,6 +200,7 @@ void _raw_write_lock_wait_flags(arch_rwlock_t *rw, unsigned long flags)
local_irq_disable();
if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000))
return;
local_irq_restore(flags);
}
}
EXPORT_SYMBOL(_raw_write_lock_wait_flags);