block: sysfs store function needs to grab queue_lock and use queue_flag_*()
Concurrency isn't a big deal here since we have requests in flight
at this point, but do the locked variant to set a better example.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index e85c401..304ec73 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -146,11 +146,13 @@
unsigned long nm;
ssize_t ret = queue_var_store(&nm, page, count);
+ spin_lock_irq(q->queue_lock);
if (nm)
- set_bit(QUEUE_FLAG_NOMERGES, &q->queue_flags);
+ queue_flag_set(QUEUE_FLAG_NOMERGES, q);
else
- clear_bit(QUEUE_FLAG_NOMERGES, &q->queue_flags);
+ queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
+ spin_unlock_irq(q->queue_lock);
return ret;
}