Patch "xen/scsiback: correct frontend counting" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

xen/scsiback: correct frontend counting

to the 4.4-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:
xen-scsiback-correct-frontend-counting.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Juergen Gross <[email protected]>
Date: Mon, 8 Feb 2016 15:30:18 +0100
Subject: xen/scsiback: correct frontend counting

From: Juergen Gross <[email protected]>

commit f285aa8db7cc4432c1a03f8b55ff34fe96317c11 upstream.

When adding a new frontend to xen-scsiback don't decrement the number of active frontends in case of no error. Doing so results in a failure when trying to remove the xen-pvscsi nexus even if no domain is using it.

---
 drivers/xen/xen-scsiback.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

@@ -939,12 +939,12 @@ out:
 	spin_unlock_irqrestore(&info->v2p_lock, flags);
 
 out_free:
-	mutex_lock(&tpg->tv_tpg_mutex);
-	tpg->tv_tpg_fe_count--;
-	mutex_unlock(&tpg->tv_tpg_mutex);
-
-	if (err)
+	if (err) {
+		mutex_lock(&tpg->tv_tpg_mutex);
+		tpg->tv_tpg_fe_count--;
+		mutex_unlock(&tpg->tv_tpg_mutex);
 		kfree(new);
+	}
 
 	return err;
 }

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/xen-scsiback-correct-frontend-counting.patch