This is a note to let you know that I've just added the patch titled
SCSI: enclosure: fix WARN_ON in dual path device removing
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-enclosure-fix-warn_on-in-dual-path-device-removing.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a1470c7bf3a4676e62e4c0fb204e339399eb5c59 Mon Sep 17 00:00:00 2001
From: James Bottomley <JBottomley@xxxxxxxxxxxxx>
Date: Fri, 15 Nov 2013 14:58:00 -0800
Subject: SCSI: enclosure: fix WARN_ON in dual path device removing
From: James Bottomley <JBottomley@xxxxxxxxxxxxx>
commit a1470c7bf3a4676e62e4c0fb204e339399eb5c59 upstream.
Bug report from: wenxiong@xxxxxxxxxxxxxxxxxx
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@xxxxxxxxxxxxxxxxxx
Signed-off-by: James Bottomley <JBottomley@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/misc/enclosure.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/drivers/misc/enclosure.c
+++ b/drivers/misc/enclosure.c
@@ -198,6 +198,13 @@ static void enclosure_remove_links(struc
{
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");
Patches currently in stable-queue which might be from JBottomley@xxxxxxxxxxxxx are
queue-3.4/scsi-libsas-fix-usage-of-ata_tf_to_fis.patch
queue-3.4/scsi-hpsa-do-not-discard-scsi-status-on-aborted-commands.patch
queue-3.4/scsi-hpsa-return-0-from-driver-probe-function-on-success-not-1.patch
queue-3.4/scsi-enclosure-fix-warn_on-in-dual-path-device-removing.patch
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