[3.19.y-ckt stable] Patch "qla2xxx: disable scsi_transport_fc registration in target mode" has been added to staging queue

[Kamal Mostafa]

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

    qla2xxx: disable scsi_transport_fc registration in target mode

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

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt6.

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
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 3082cb54822de26710cce0260ae26f296ddbc44f Mon Sep 17 00:00:00 2001
From: Alexei Potashnik <alexei at purestorage.com>
Date: Tue, 14 Jul 2015 16:00:47 -0400
Subject: qla2xxx: disable scsi_transport_fc registration in target mode

commit d20ed91bb60ca54c42e3326251287ec51ed225a1 upstream.

There are multiple reasons for disabling this:

1. It provides no functional benefit. We pretty much only get a few more
sysfs entries for each port, but all that information is already
available from /sys/kernel/debug/target/qla-session-X

2. It already only works in private-loop mode. By disabling we'll be
getting more uniform behavior with fabric mode.

3. It creates complications for the new PLOGI handling mechanism:
scsi_transport_fc port deletion timer could race with new session
from initiator and cause logout after successful login.

Signed-off-by: Alexei Potashnik <alexei at purestorage.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani at qlogic.com>
Signed-off-by: Nicholas Bellinger <nab at linux-iscsi.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/scsi/qla2xxx/qla_init.c | 14 +++++++++++---
 drivers/scsi/qla2xxx/qla_os.c   |  3 ++-
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index 664ea17..99fef23 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -3289,8 +3289,7 @@ qla2x00_update_fcport(scsi_qla_host_t *vha, fc_port_t *fcport)

 	if (IS_QLAFX00(vha->hw)) {
 		qla2x00_set_fcport_state(fcport, FCS_ONLINE);
-		qla2x00_reg_remote_port(vha, fcport);
-		return;
+		goto reg_port;
 	}
 	fcport->login_retry = 0;
 	fcport->flags &= ~(FCF_LOGIN_NEEDED | FCF_ASYNC_SENT);
@@ -3298,7 +3297,16 @@ qla2x00_update_fcport(scsi_qla_host_t *vha, fc_port_t *fcport)
 	qla2x00_set_fcport_state(fcport, FCS_ONLINE);
 	qla2x00_iidma_fcport(vha, fcport);
 	qla24xx_update_fcport_fcp_prio(vha, fcport);
-	qla2x00_reg_remote_port(vha, fcport);
+
+reg_port:
+	if (qla_ini_mode_enabled(vha))
+		qla2x00_reg_remote_port(vha, fcport);
+	else {
+		/*
+		 * Create target mode FC NEXUS in qla_target.c
+		 */
+		qlt_fc_port_added(vha, fcport);
+	}
 }

 /*
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 3a0a3ce..56d8684 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -3234,7 +3234,8 @@ qla2x00_schedule_rport_del(struct scsi_qla_host *vha, fc_port_t *fcport,
 		qla2xxx_wake_dpc(base_vha);
 	} else {
 		int now;
-		fc_remote_port_delete(rport);
+		if (rport)
+			fc_remote_port_delete(rport);
 		qlt_do_generation_tick(vha, &now);
 		qlt_fc_port_deleted(vha, fcport, now);
 	}
--
1.9.1