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-rw-r--r--drivers/block/nbd.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 7bcc1d8bc967..34f80fa6fed1 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -406,6 +406,7 @@ static int nbd_do_it(struct nbd_device *lo)
ret = sysfs_create_file(&disk_to_dev(lo->disk)->kobj, &pid_attr.attr);
if (ret) {
printk(KERN_ERR "nbd: sysfs_create_file failed!");
+ lo->pid = 0;
return ret;
}
@@ -413,6 +414,7 @@ static int nbd_do_it(struct nbd_device *lo)
nbd_end_request(req);
sysfs_remove_file(&disk_to_dev(lo->disk)->kobj, &pid_attr.attr);
+ lo->pid = 0;
return 0;
}
@@ -648,6 +650,8 @@ static int nbd_ioctl(struct block_device *bdev, fmode_t mode,
set_capacity(lo->disk, lo->bytesize >> 9);
return 0;
case NBD_DO_IT:
+ if (lo->pid)
+ return -EBUSY;
if (!lo->file)
return -EINVAL;
thread = kthread_create(nbd_thread, lo, lo->disk->disk_name);