diff options
| -rw-r--r-- | block/blk-sysfs.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index d3aa2aadb3e..b78c9c3e267 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -40,7 +40,12 @@ queue_requests_store(struct request_queue *q, const char *page, size_t count) { struct request_list *rl = &q->rq; unsigned long nr; - int ret = queue_var_store(&nr, page, count); + int ret; + + if (!q->request_fn) + return -EINVAL; + + ret = queue_var_store(&nr, page, count); if (nr < BLKDEV_MIN_RQ) nr = BLKDEV_MIN_RQ; |