Use q->elevator with ->elevator_lock held in elv_iosched_show(), since
the local cached elevator reference may become stale after getting
->elevator_lock.
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
Reviewed-by: Nilay Shroff <nilay@xxxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
block/elevator.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/block/elevator.c b/block/elevator.c
index 5051a98dc08c..b32815594892 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -739,7 +739,6 @@ ssize_t elv_iosched_store(struct gendisk *disk, const char *buf,
ssize_t elv_iosched_show(struct gendisk *disk, char *name)
{
struct request_queue *q = disk->queue;
- struct elevator_queue *eq = q->elevator;
struct elevator_type *cur = NULL, *e;
int len = 0;
@@ -748,7 +747,7 @@ ssize_t elv_iosched_show(struct gendisk *disk, char *name)
len += sprintf(name+len, "[none] ");
} else {
len += sprintf(name+len, "none ");
- cur = eq->type;
+ cur = q->elevator->type;
}
spin_lock(&elv_list_lock);
--
2.47.0
