[3.19.y-ckt stable] Patch "scsi: Add intermediate STARGET_REMOVE state to scsi_target_state" has been added to the 3.19.y-ckt tree

Kamal Mostafa kamal at canonical.com
Wed Jul 6 21:00:08 UTC 2016

This is a note to let you know that I have just added a patch titled

    scsi: Add intermediate STARGET_REMOVE state to scsi_target_state

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:


This patch is scheduled to be released in version 3.19.8-ckt23.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.19.y-ckt tree, see



>From 2312f9725f59e930e397ca98ee6685854eeed92a Mon Sep 17 00:00:00 2001
From: Johannes Thumshirn <jthumshirn at suse.de>
Date: Tue, 5 Apr 2016 11:50:44 +0200
Subject: scsi: Add intermediate STARGET_REMOVE state to scsi_target_state

commit f05795d3d771f30a7bdc3a138bf714b06d42aa95 upstream.

Add intermediate STARGET_REMOVE state to scsi_target_state to avoid
running into the BUG_ON() in scsi_target_reap(). The STARGET_REMOVE
state is only valid in the path from scsi_remove_target() to
scsi_target_destroy() indicating this target is going to be removed.

This re-fixes the problem introduced in commits bc3f02a795d3 ("[SCSI]
scsi_remove_target: fix softlockup regression on hot remove") and
40998193560d ("scsi: restart list search after unlock in
scsi_remove_target") in a more comprehensive way.

[mkp: Included James' fix for scsi_target_destroy()]

Signed-off-by: Johannes Thumshirn <jthumshirn at suse.de>
Fixes: 40998193560dab6c3ce8d25f4fa58a23e252ef38
Reported-by: Sergey Senozhatsky <sergey.senozhatsky at gmail.com>
Tested-by: Sergey Senozhatsky <sergey.senozhatsky at gmail.com>
Reviewed-by: Ewan D. Milne <emilne at redhat.com>
Reviewed-by: Hannes Reinecke <hare at suse.com>
Reviewed-by: James Bottomley <jejb at linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen at oracle.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
 drivers/scsi/scsi_scan.c   | 1 +
 drivers/scsi/scsi_sysfs.c  | 2 ++
 include/scsi/scsi_device.h | 1 +
 3 files changed, 4 insertions(+)

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index cc662c9..2255b3a 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -325,6 +325,7 @@ static void scsi_target_destroy(struct scsi_target *starget)
 	struct Scsi_Host *shost = dev_to_shost(dev->parent);
 	unsigned long flags;

+	BUG_ON(starget->state == STARGET_DEL);
 	starget->state = STARGET_DEL;
 	spin_lock_irqsave(shost->host_lock, flags);
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 168a509..c6126e0 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -1155,11 +1155,13 @@ restart:
 	spin_lock_irqsave(shost->host_lock, flags);
 	list_for_each_entry(starget, &shost->__targets, siblings) {
 		if (starget->state == STARGET_DEL ||
+		    starget->state == STARGET_REMOVE ||
 		    starget == last_target)
 		if (starget->dev.parent == dev || &starget->dev == dev) {
 			last_target = starget;
+			starget->state = STARGET_REMOVE;
 			spin_unlock_irqrestore(shost->host_lock, flags);
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 3a4edd1..faa527d 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -263,6 +263,7 @@ struct scsi_dh_data {
 enum scsi_target_state {


More information about the kernel-team mailing list