From: Hannes Reinecke <hare@suse.com>
Date: Fri, 23 Aug 2019 02:52:42 -0700
Subject: scsi: qedf: Use discovery list to traverse rports
Git-commit: 5797bcc897c363a775ac3d929b62d2579bdf8573
Patch-mainline: v5.4-rc1
References: bsc#1149976

The list of rports might become stale so we should rather traverse the
discovery list when trying relogin.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Saurav Kashyap <skashyap@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Lee Duncan <lduncan@suse.com>
---
 drivers/scsi/qedf/qedf_main.c | 39 +++++++--------------------------------
 1 file changed, 7 insertions(+), 32 deletions(-)

diff --git a/drivers/scsi/qedf/qedf_main.c b/drivers/scsi/qedf/qedf_main.c
index 884587351df8..0856d136bab6 100644
--- a/drivers/scsi/qedf/qedf_main.c
+++ b/drivers/scsi/qedf/qedf_main.c
@@ -343,11 +343,6 @@ int qedf_send_flogi(struct qedf_ctx *qedf)
 	return 0;
 }
 
-struct qedf_tmp_rdata_item {
-	struct fc_rport_priv *rdata;
-	struct list_head list;
-};
-
 /*
  * This function is called if link_down_tmo is in use.  If we get a link up and
  * link_down_tmo has not expired then use just FLOGI/ADISC to recover our
@@ -357,9 +352,8 @@ static void qedf_link_recovery(struct work_struct *work)
 {
 	struct qedf_ctx *qedf =
 	    container_of(work, struct qedf_ctx, link_recovery.work);
-	struct qedf_rport *fcport;
+	struct fc_lport *lport = qedf->lport;
 	struct fc_rport_priv *rdata;
-	struct qedf_tmp_rdata_item *rdata_item, *tmp_rdata_item;
 	bool rc;
 	int retries = 30;
 	int rval, i;
@@ -426,33 +420,14 @@ static void qedf_link_recovery(struct work_struct *work)
 	 * Call lport->tt.rport_login which will cause libfc to send an
 	 * ADISC since the rport is in state ready.
 	 */
-	rcu_read_lock();
-	list_for_each_entry_rcu(fcport, &qedf->fcports, peers) {
-		rdata = fcport->rdata;
-		if (rdata == NULL)
-			continue;
-		rdata_item = kzalloc(sizeof(struct qedf_tmp_rdata_item),
-		    GFP_ATOMIC);
-		if (!rdata_item)
-			continue;
+	mutex_lock(&lport->disc.disc_mutex);
+	list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
 		if (kref_get_unless_zero(&rdata->kref)) {
-			rdata_item->rdata = rdata;
-			list_add(&rdata_item->list, &rdata_login_list);
-		} else
-			kfree(rdata_item);
-	}
-	rcu_read_unlock();
-	/*
-	 * Do the fc_rport_login outside of the rcu lock so we don't take a
-	 * mutex in an atomic context.
-	 */
-	list_for_each_entry_safe(rdata_item, tmp_rdata_item, &rdata_login_list,
-	    list) {
-		list_del(&rdata_item->list);
-		fc_rport_login(rdata_item->rdata);
-		kref_put(&rdata_item->rdata->kref, fc_rport_destroy);
-		kfree(rdata_item);
+			fc_rport_login(rdata);
+			kref_put(&rdata->kref, fc_rport_destroy);
+		}
 	}
+	mutex_unlock(&lport->disc.disc_mutex);
 }
 
 static void qedf_update_link_speed(struct qedf_ctx *qedf,