Patch "qla_target: don't delete changed nacls" has been added to the 3.10-stable tree

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

    qla_target: don't delete changed nacls

to the 3.10-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:
     qla_target-don-t-delete-changed-nacls.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From f4c24db1b7ad0ce84409e15744d26c6f86a96840 Mon Sep 17 00:00:00 2001
From: Joern Engel <joern@xxxxxxxxx>
Date: Fri, 3 Oct 2014 14:35:56 -0700
Subject: qla_target: don't delete changed nacls

From: Joern Engel <joern@xxxxxxxxx>

commit f4c24db1b7ad0ce84409e15744d26c6f86a96840 upstream.

The code is currently riddled with "drop the hardware_lock to avoid a
deadlock" bugs that expose races.  One of those races seems to expose a
valid warning in tcm_qla2xxx_clear_nacl_from_fcport_map.  Add some
bandaid to it.

Signed-off-by: Joern Engel <joern@xxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/scsi/qla2xxx/tcm_qla2xxx.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

--- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c
+++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c
@@ -762,7 +762,16 @@ static void tcm_qla2xxx_clear_nacl_from_
 	pr_debug("fc_rport domain: port_id 0x%06x\n", nacl->nport_id);
 
 	node = btree_remove32(&lport->lport_fcport_map, nacl->nport_id);
-	WARN_ON(node && (node != se_nacl));
+	if (WARN_ON(node && (node != se_nacl))) {
+		/*
+		 * The nacl no longer matches what we think it should be.
+		 * Most likely a new dynamic acl has been added while
+		 * someone dropped the hardware lock.  It clearly is a
+		 * bug elsewhere, but this bit can't make things worse.
+		 */
+		btree_insert32(&lport->lport_fcport_map, nacl->nport_id,
+			       node, GFP_ATOMIC);
+	}
 
 	pr_debug("Removed from fcport_map: %p for WWNN: 0x%016LX, port_id: 0x%06x\n",
 	    se_nacl, nacl->nport_wwnn, nacl->nport_id);


Patches currently in stable-queue which might be from joern@xxxxxxxxx are

queue-3.10/qla_target-don-t-delete-changed-nacls.patch
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