NOMMU: Fix MAP_PRIVATE mmap() of objects where the data can be mapped directly

[linux-block.git] / block / blk-sysfs.c

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index d3aa2aadb3e0e7d18645a2eb9333698f4984263a..b78c9c3e26705f45fb1e90ac116dc8bb96c8122b 100644 (file)
--- 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;