2 files changed, 106 insertions, 3 deletions

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 0ac2dedb413c..ea4abee7a2a9 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -3123,6 +3123,7 @@ static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
 
 	vhost->discovery_threads--;
 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
+	del_timer(&tgt->timer);
 
 	switch (status) {
 	case IBMVFC_MAD_SUCCESS:
@@ -3179,9 +3180,89 @@ static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
 }
 
 /**
+ * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
+ * @evt:		ibmvfc event struct
+ *
+ * Just cleanup this event struct. Everything else is handled by
+ * the ADISC completion handler. If the ADISC never actually comes
+ * back, we still have the timer running on the ADISC event struct
+ * which will fire and cause the CRQ to get reset.
+ *
+ **/
+static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
+{
+	struct ibmvfc_host *vhost = evt->vhost;
+	struct ibmvfc_target *tgt = evt->tgt;
+
+	tgt_dbg(tgt, "ADISC cancel complete\n");
+	vhost->abort_threads--;
+	ibmvfc_free_event(evt);
+	kref_put(&tgt->kref, ibmvfc_release_tgt);
+	wake_up(&vhost->work_wait_q);
+}
+
+/**
+ * ibmvfc_adisc_timeout - Handle an ADISC timeout
+ * @tgt:		ibmvfc target struct
+ *
+ * If an ADISC times out, send a cancel. If the cancel times
+ * out, reset the CRQ. When the ADISC comes back as cancelled,
+ * log back into the target.
+ **/
+static void ibmvfc_adisc_timeout(struct ibmvfc_target *tgt)
+{
+	struct ibmvfc_host *vhost = tgt->vhost;
+	struct ibmvfc_event *evt;
+	struct ibmvfc_tmf *tmf;
+	unsigned long flags;
+	int rc;
+
+	tgt_dbg(tgt, "ADISC timeout\n");
+	spin_lock_irqsave(vhost->host->host_lock, flags);
+	if (vhost->abort_threads >= disc_threads ||
+	    tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
+	    vhost->state != IBMVFC_INITIALIZING ||
+	    vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
+		spin_unlock_irqrestore(vhost->host->host_lock, flags);
+		return;
+	}
+
+	vhost->abort_threads++;
+	kref_get(&tgt->kref);
+	evt = ibmvfc_get_event(vhost);
+	ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
+
+	evt->tgt = tgt;
+	tmf = &evt->iu.tmf;
+	memset(tmf, 0, sizeof(*tmf));
+	tmf->common.version = 1;
+	tmf->common.opcode = IBMVFC_TMF_MAD;
+	tmf->common.length = sizeof(*tmf);
+	tmf->scsi_id = tgt->scsi_id;
+	tmf->cancel_key = tgt->cancel_key;
+
+	rc = ibmvfc_send_event(evt, vhost, default_timeout);
+
+	if (rc) {
+		tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
+		vhost->abort_threads--;
+		kref_put(&tgt->kref, ibmvfc_release_tgt);
+		__ibmvfc_reset_host(vhost);
+	} else
+		tgt_dbg(tgt, "Attempting to cancel ADISC\n");
+	spin_unlock_irqrestore(vhost->host->host_lock, flags);
+}
+
+/**
  * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
  * @tgt:		ibmvfc target struct
  *
+ * When sending an ADISC we end up with two timers running. The
+ * first timer is the timer in the ibmvfc target struct. If this
+ * fires, we send a cancel to the target. The second timer is the
+ * timer on the ibmvfc event for the ADISC, which is longer. If that
+ * fires, it means the ADISC timed out and our attempt to cancel it
+ * also failed, so we need to reset the CRQ.
  **/
 static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
 {
@@ -3202,6 +3283,7 @@ static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
 	mad = &evt->iu.passthru;
 	mad->iu.flags = IBMVFC_FC_ELS;
 	mad->iu.scsi_id = tgt->scsi_id;
+	mad->iu.cancel_key = tgt->cancel_key;
 
 	mad->fc_iu.payload[0] = IBMVFC_ADISC;
 	memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
@@ -3210,9 +3292,19 @@ static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
 	       sizeof(vhost->login_buf->resp.node_name));
 	mad->fc_iu.payload[6] = vhost->login_buf->resp.scsi_id & 0x00ffffff;
 
+	if (timer_pending(&tgt->timer))
+		mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
+	else {
+		tgt->timer.data = (unsigned long) tgt;
+		tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
+		tgt->timer.function = (void (*)(unsigned long))ibmvfc_adisc_timeout;
+		add_timer(&tgt->timer);
+	}
+
 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
-	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
+	if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
 		vhost->discovery_threads--;
+		del_timer(&tgt->timer);
 		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
 		kref_put(&tgt->kref, ibmvfc_release_tgt);
 	} else
@@ -3340,6 +3432,8 @@ static int ibmvfc_alloc_target(struct ibmvfc_host *vhost, u64 scsi_id)
 	tgt->new_scsi_id = scsi_id;
 	tgt->vhost = vhost;
 	tgt->need_login = 1;
+	tgt->cancel_key = vhost->task_set++;
+	init_timer(&tgt->timer);
 	kref_init(&tgt->kref);
 	ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
 	spin_lock_irqsave(vhost->host->host_lock, flags);
@@ -3734,6 +3828,7 @@ static void ibmvfc_do_work(struct ibmvfc_host *vhost)
 				spin_unlock_irqrestore(vhost->host->host_lock, flags);
 				if (rport)
 					fc_remote_port_delete(rport);
+				del_timer_sync(&tgt->timer);
 				kref_put(&tgt->kref, ibmvfc_release_tgt);
 				return;
 			}
@@ -4061,6 +4156,7 @@ static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 	vhost->dev = dev;
 	vhost->partition_number = -1;
 	vhost->log_level = log_level;
+	vhost->task_set = 1;
 	strcpy(vhost->partition_name, "UNKNOWN");
 	init_waitqueue_head(&vhost->work_wait_q);
 	init_waitqueue_head(&vhost->init_wait_q);
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h
index 70107522e3a9..0f14fd3c40d2 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.h
+++ b/drivers/scsi/ibmvscsi/ibmvfc.h
@@ -33,6 +33,10 @@
 #define IBMVFC_DRIVER_DATE		"(November 14, 2008)"
 
 #define IBMVFC_DEFAULT_TIMEOUT	60
+#define IBMVFC_ADISC_CANCEL_TIMEOUT	45
+#define IBMVFC_ADISC_TIMEOUT		15
+#define IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT	\
+		(IBMVFC_ADISC_TIMEOUT + IBMVFC_ADISC_CANCEL_TIMEOUT)
 #define IBMVFC_INIT_TIMEOUT		120
 #define IBMVFC_MAX_REQUESTS_DEFAULT	100
 
@@ -53,9 +57,9 @@
  * Ensure we have resources for ERP and initialization:
  * 1 for ERP
  * 1 for initialization
- * 1 for each discovery thread
+ * 2 for each discovery thread
  */
-#define IBMVFC_NUM_INTERNAL_REQ	(1 + 1 + disc_threads)
+#define IBMVFC_NUM_INTERNAL_REQ	(1 + 1 + (disc_threads * 2))
 
 #define IBMVFC_MAD_SUCCESS		0x00
 #define IBMVFC_MAD_NOT_SUPPORTED	0xF1
@@ -585,10 +589,12 @@ struct ibmvfc_target {
 	enum ibmvfc_target_action action;
 	int need_login;
 	int init_retries;
+	u32 cancel_key;
 	struct ibmvfc_service_parms service_parms;
 	struct ibmvfc_service_parms service_parms_change;
 	struct fc_rport_identifiers ids;
 	void (*job_step) (struct ibmvfc_target *);
+	struct timer_list timer;
 	struct kref kref;
 };
 
@@ -672,6 +678,7 @@ struct ibmvfc_host {
 	int task_set;
 	int init_retries;
 	int discovery_threads;
+	int abort_threads;
 	int client_migrated;
 	int reinit;
 	int delay_init;