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authorJames Bottomley <JBottomley@Parallels.com>2013-11-15 14:58:00 -0800
committerJames Bottomley <JBottomley@Parallels.com>2013-12-02 11:13:14 -0800
commita1470c7bf3a4676e62e4c0fb204e339399eb5c59 (patch)
tree5678d07f70cadae7509067b2118a956400d41ff8 /drivers/misc
parent6cd60b37f72b2d15b8983431546af50b7064935d (diff)
[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 <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/enclosure.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c
index 0e8df41aaf1..2cf2bbc0b92 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");