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 284d879a..1dd282c 100644
--- a/arch/s390/lib/spinlock.c
+++ b/arch/s390/lib/spinlock.c
@@ -143,6 +143,7 @@
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 @@
local_irq_disable();
if (_raw_compare_and_swap(&rw->lock, 0, 0x80000000))
return;
+ local_irq_restore(flags);
}
}
EXPORT_SYMBOL(_raw_write_lock_wait_flags);