diff options
| author | James Bottomley <JBottomley@Parallels.com> | 2013-11-15 14:58:00 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-12-11 22:36:27 -0800 |
| commit | e891b8e307009b44fa1e70a49a59e8db6cbe12fa (patch) | |
| tree | 2dd8293a889b4e4c974a286c429e56ca18c4c1e0 /drivers/misc/enclosure.c | |
| parent | f8ce2dfb243bedc9113a722ae3614c6f33791923 (diff) | |
SCSI: enclosure: fix WARN_ON in dual path device removing
commit a1470c7bf3a4676e62e4c0fb204e339399eb5c59 upstream.
Bug report from: wenxiong@linux.vnet.ibm.com
The issue is happened in dual controller configuration. We got the
sysfs warnings when rmmod the ipr module.
enclosure_unregister() in drivers/msic/enclosure.c, call device_unregister()
for each componment deivce, device_unregister() ->device_del()->kobject_del()
->sysfs_remove_dir(). In sysfs_remove_dir(), set kobj->sd = NULL.
For each componment device,
enclosure_component_release()->enclosure_remove_links()->sysfs_remove_link()
in which checking kobj->sd again, it has been set as NULL when doing
device_unregister. So we saw all these sysfs WARNING.
Tested-by: wenxiong@linux.vnet.ibm.com
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/enclosure.c')
| -rw-r--r-- | drivers/misc/enclosure.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c index 00e5fcac8fdf..cbee842f8b6b 100644 --- a/drivers/misc/enclosure.c +++ b/drivers/misc/enclosure.c @@ -198,6 +198,13 @@ static void enclosure_remove_links(struct enclosure_component *cdev) { char name[ENCLOSURE_NAME_SIZE]; + /* + * In odd circumstances, like multipath devices, something else may + * already have removed the links, so check for this condition first. + */ + if (!cdev->dev->kobj.sd) + return; + enclosure_link_name(cdev, name); sysfs_remove_link(&cdev->dev->kobj, name); sysfs_remove_link(&cdev->cdev.kobj, "device"); |