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Close race in md_probe

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There is a possible race in md_probe.  If two threads call md_probe
for the same device, then one could exit (having checked that
->gendisk exists) before the other has called kobject_init_and_add,
thus returning an incomplete kobj which will cause problems when
we try to add children to it.

So extend the range of protection of disks_mutex slightly to
avoid this possibility.

Signed-off-by: Neil Brown <neilb@suse.de>
This commit is contained in:
Neil Brown 2008-06-28 08:31:26 +10:00
parent 5e96ee65c8
commit f48ed53838
1 changed files with 1 additions and 1 deletions
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2
drivers/md/md.c
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@ -3359,9 +3359,9 @@ static struct kobject *md_probe(dev_t dev, int *part, void *data)
disk->queue = mddev->queue;
add_disk(disk);
mddev->gendisk = disk;
mutex_unlock(&disks_mutex);
error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
"%s", "md");
mutex_unlock(&disks_mutex);
if (error)
printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
disk->disk_name);