[SCSI] fc transport: pre-emptively terminate i/o upon dev_loss_tmo timeout

Pre-emptively terminate i/o on the rport if dev_loss_tmo has fired.
The desire is to terminate everything, so that the i/o is cleaned up
prior to the sdev's being unblocked, thus any outstanding timeouts/aborts
are avoided.

Also, we do this early enough such that the rport's port_id field is
still valid. FCOE libFC code needs this info to find the i/o's to
terminate.

Signed-off-by: James Smart <james.smart@emulex.com>
[michaelc@cs.wisc.edu: remove extra scsi_target_unblock call]
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 1e71abf0607a..062304de4854 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -3012,6 +3012,16 @@ fc_timeout_deleted_rport(struct work_struct *work)
         rport->port_state = FC_PORTSTATE_NOTPRESENT;
         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
 
+        /*
+         * Pre-emptively kill I/O rather than waiting for the work queue
+         * item to teardown the starget. (FCOE libFC folks prefer this
+         * and to have the rport_port_id still set when it's done).
+         */
+        spin_unlock_irqrestore(shost->host_lock, flags);
+        fc_terminate_rport_io(rport);
+
+        BUG_ON(rport->port_state != FC_PORTSTATE_NOTPRESENT);
+
         /* remove the identifiers that aren't used in the consisting binding */
         switch (fc_host->tgtid_bind_type) {
         case FC_TGTID_BIND_BY_WWPN:
@@ -3035,9 +3045,6 @@ fc_timeout_deleted_rport(struct work_struct *work)
          * went away and didn't come back - we'll remove
          * all attached scsi devices.
          */
-        spin_unlock_irqrestore(shost->host_lock, flags);
-
-        scsi_target_unblock(&rport->dev);
         fc_queue_work(shost, &rport->stgt_delete_work);
 }