From a1470c7bf3a4676e62e4c0fb204e339399eb5c59 Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Fri, 15 Nov 2013 14:58:00 -0800 Subject: [PATCH] [SCSI] enclosure: fix WARN_ON in dual path device removing 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 Cc: stable@vger.kernel.org Signed-off-by: James Bottomley --- drivers/misc/enclosure.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c index 0e8df41aaf14..2cf2bbc0b927 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"); -- 2.20.1