From 10e1a44ab2bfc850f5ccca5624c68f7c7f8c460c Mon Sep 17 00:00:00 2001
From: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Date: Fri, 19 Aug 2016 15:20:19 +0530
Subject: scsi: be2iscsi: Fail the sessions immediately after TPE

Sessions are no longer valid, so schedule sess_work to fail the sessions
immediately when error is detected. This is done to avoid iSCSI transport
layer to keep sending NOP-Out which driver any ways fail.

Schedule sess_work immediately in case of HBA error. Old sessions are gone
for good and need to be re-established.

iscsi_session_failure needs process context hence this work.

Signed-off-by: Jitendra Bhivare <jitendra.bhivare@broadcom.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c
index 0625bd0..cf82973 100644
--- a/drivers/scsi/be2iscsi/be_main.c
+++ b/drivers/scsi/be2iscsi/be_main.c
@@ -5398,7 +5398,10 @@ static void beiscsi_hw_health_check(unsigned long ptr)
 	if (beiscsi_detect_ue(phba)) {
 		__beiscsi_log(phba, KERN_ERR,
 			      "BM_%d : port in error: %lx\n", phba->state);
-		/* detect TPE if UER supported */
+		/* sessions are no longer valid, so first fail the sessions */
+		queue_work(phba->wq, &phba->sess_work);
+
+		/* detect UER supported */
 		if (!test_bit(BEISCSI_HBA_UER_SUPP, &phba->state))
 			return;
 		/* modify this timer to check TPE */
@@ -5562,12 +5565,24 @@ static void beiscsi_disable_port(struct beiscsi_hba *phba, int unload)
 	hwi_cleanup_port(phba);
 }
 
+static void beiscsi_sess_work(struct work_struct *work)
+{
+	struct beiscsi_hba *phba;
+
+	phba = container_of(work, struct beiscsi_hba, sess_work);
+	/*
+	 * This work gets scheduled only in case of HBA error.
+	 * Old sessions are gone so need to be re-established.
+	 * iscsi_session_failure needs process context hence this work.
+	 */
+	iscsi_host_for_each_session(phba->shost, beiscsi_session_fail);
+}
+
 static void beiscsi_recover_port(struct work_struct *work)
 {
 	struct beiscsi_hba *phba;
 
 	phba = container_of(work, struct beiscsi_hba, recover_port.work);
-	iscsi_host_for_each_session(phba->shost, beiscsi_session_fail);
 	beiscsi_disable_port(phba, 0);
 	beiscsi_enable_port(phba);
 }
@@ -5587,6 +5602,8 @@ static pci_ers_result_t beiscsi_eeh_err_detected(struct pci_dev *pdev,
 	del_timer_sync(&phba->hw_check);
 	cancel_delayed_work_sync(&phba->recover_port);
 
+	/* sessions are no longer valid, so first fail the sessions */
+	iscsi_host_for_each_session(phba->shost, beiscsi_session_fail);
 	beiscsi_disable_port(phba, 0);
 
 	if (state == pci_channel_io_perm_failure) {
@@ -5832,6 +5849,7 @@ static int beiscsi_dev_probe(struct pci_dev *pcidev,
 	schedule_delayed_work(&phba->eqd_update,
 			      msecs_to_jiffies(BEISCSI_EQD_UPDATE_INTERVAL));
 
+	INIT_WORK(&phba->sess_work, beiscsi_sess_work);
 	INIT_DELAYED_WORK(&phba->recover_port, beiscsi_recover_port);
 	/**
 	 * Start UE detection here. UE before this will cause stall in probe
@@ -5842,7 +5860,6 @@ static int beiscsi_dev_probe(struct pci_dev *pcidev,
 	phba->hw_check.data = (unsigned long)phba;
 	mod_timer(&phba->hw_check,
 		  jiffies + msecs_to_jiffies(BEISCSI_UE_DETECT_INTERVAL));
-
 	beiscsi_log(phba, KERN_INFO, BEISCSI_LOG_INIT,
 		    "\n\n\n BM_%d : SUCCESS - DRIVER LOADED\n\n\n");
 	return 0;
@@ -5888,6 +5905,7 @@ static void beiscsi_remove(struct pci_dev *pcidev)
 	/* first stop UE detection before unloading */
 	del_timer_sync(&phba->hw_check);
 	cancel_delayed_work_sync(&phba->recover_port);
+	cancel_work_sync(&phba->sess_work);
 
 	beiscsi_iface_destroy_default(phba);
 	iscsi_host_remove(phba->shost);
diff --git a/drivers/scsi/be2iscsi/be_main.h b/drivers/scsi/be2iscsi/be_main.h
index 1fd6c18..953d94a 100644
--- a/drivers/scsi/be2iscsi/be_main.h
+++ b/drivers/scsi/be2iscsi/be_main.h
@@ -418,6 +418,7 @@ struct beiscsi_hba {
 #define BEISCSI_UE_DETECT_INTERVAL	1000
 	u32 ue2rp;
 	struct delayed_work recover_port;
+	struct work_struct sess_work;
 
 	bool mac_addr_set;
 	u8 mac_address[ETH_ALEN];
-- 
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