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>

diff --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c
index 284d879..1dd282c 100644 (file)
--- a/arch/s390/lib/spinlock.c
+++ b/arch/s390/lib/spinlock.c
@@ -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);