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Commit 939c5ae4 authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent bae8f567

arch/s390/lib/spinlock.c

+2 −0
Original line number Diff line number Diff line
@@ -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);