1 files changed, 48 insertions, 35 deletions

diff --git a/drivers/scsi/libfc/fc_disc.c b/drivers/scsi/libfc/fc_disc.c
index c7985da8809..880a9068ca1 100644
--- a/drivers/scsi/libfc/fc_disc.c
+++ b/drivers/scsi/libfc/fc_disc.c
@@ -35,6 +35,7 @@
 #include <linux/timer.h>
 #include <linux/slab.h>
 #include <linux/err.h>
+#include <linux/export.h>
 #include <asm/unaligned.h>
 
 #include <scsi/fc/fc_gs.h>
@@ -60,30 +61,28 @@ static void fc_disc_restart(struct fc_disc *);
  * Locking Note: This function expects that the lport mutex is locked before
  * calling it.
  */
-void fc_disc_stop_rports(struct fc_disc *disc)
+static void fc_disc_stop_rports(struct fc_disc *disc)
 {
 	struct fc_lport *lport;
-	struct fc_rport_priv *rdata, *next;
+	struct fc_rport_priv *rdata;
 
-	lport = disc->lport;
+	lport = fc_disc_lport(disc);
 
 	mutex_lock(&disc->disc_mutex);
-	list_for_each_entry_safe(rdata, next, &disc->rports, peers)
+	list_for_each_entry_rcu(rdata, &disc->rports, peers)
 		lport->tt.rport_logoff(rdata);
 	mutex_unlock(&disc->disc_mutex);
 }
 
 /**
  * fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN)
- * @sp:	   The sequence of the RSCN exchange
+ * @disc:  The discovery object to which the RSCN applies
  * @fp:	   The RSCN frame
- * @lport: The local port that the request will be sent on
  *
  * Locking Note: This function expects that the disc_mutex is locked
  *		 before it is called.
  */
-static void fc_disc_recv_rscn_req(struct fc_seq *sp, struct fc_frame *fp,
-				  struct fc_disc *disc)
+static void fc_disc_recv_rscn_req(struct fc_disc *disc, struct fc_frame *fp)
 {
 	struct fc_lport *lport;
 	struct fc_els_rscn *rp;
@@ -96,7 +95,7 @@ static void fc_disc_recv_rscn_req(struct fc_seq *sp, struct fc_frame *fp,
 	LIST_HEAD(disc_ports);
 	struct fc_disc_port *dp, *next;
 
-	lport = disc->lport;
+	lport = fc_disc_lport(disc);
 
 	FC_DISC_DBG(disc, "Received an RSCN event\n");
 
@@ -151,7 +150,7 @@ static void fc_disc_recv_rscn_req(struct fc_seq *sp, struct fc_frame *fp,
 			break;
 		}
 	}
-	lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
+	lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL);
 
 	/*
 	 * If not doing a complete rediscovery, do GPN_ID on
@@ -177,25 +176,22 @@ static void fc_disc_recv_rscn_req(struct fc_seq *sp, struct fc_frame *fp,
 	return;
 reject:
 	FC_DISC_DBG(disc, "Received a bad RSCN frame\n");
-	rjt_data.fp = NULL;
 	rjt_data.reason = ELS_RJT_LOGIC;
 	rjt_data.explan = ELS_EXPL_NONE;
-	lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+	lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
 	fc_frame_free(fp);
 }
 
 /**
  * fc_disc_recv_req() - Handle incoming requests
- * @sp:	   The sequence of the request exchange
- * @fp:	   The request frame
  * @lport: The local port receiving the request
+ * @fp:	   The request frame
  *
  * Locking Note: This function is called from the EM and will lock
  *		 the disc_mutex before calling the handler for the
  *		 request.
  */
-static void fc_disc_recv_req(struct fc_seq *sp, struct fc_frame *fp,
-			     struct fc_lport *lport)
+static void fc_disc_recv_req(struct fc_lport *lport, struct fc_frame *fp)
 {
 	u8 op;
 	struct fc_disc *disc = &lport->disc;
@@ -204,12 +200,13 @@ static void fc_disc_recv_req(struct fc_seq *sp, struct fc_frame *fp,
 	switch (op) {
 	case ELS_RSCN:
 		mutex_lock(&disc->disc_mutex);
-		fc_disc_recv_rscn_req(sp, fp, disc);
+		fc_disc_recv_rscn_req(disc, fp);
 		mutex_unlock(&disc->disc_mutex);
 		break;
 	default:
 		FC_DISC_DBG(disc, "Received an unsupported request, "
 			    "the opcode is (%x)\n", op);
+		fc_frame_free(fp);
 		break;
 	}
 }
@@ -275,7 +272,7 @@ static void fc_disc_start(void (*disc_callback)(struct fc_lport *,
  */
 static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event)
 {
-	struct fc_lport *lport = disc->lport;
+	struct fc_lport *lport = fc_disc_lport(disc);
 	struct fc_rport_priv *rdata;
 
 	FC_DISC_DBG(disc, "Discovery complete\n");
@@ -292,7 +289,7 @@ static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event)
 	 * Skip ports which were never discovered.  These are the dNS port
 	 * and ports which were created by PLOGI.
 	 */
-	list_for_each_entry(rdata, &disc->rports, peers) {
+	list_for_each_entry_rcu(rdata, &disc->rports, peers) {
 		if (!rdata->disc_id)
 			continue;
 		if (rdata->disc_id == disc->disc_id)
@@ -313,7 +310,7 @@ static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event)
  */
 static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp)
 {
-	struct fc_lport *lport = disc->lport;
+	struct fc_lport *lport = fc_disc_lport(disc);
 	unsigned long delay = 0;
 
 	FC_DISC_DBG(disc, "Error %ld, retries %d/%d\n",
@@ -340,6 +337,13 @@ static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp)
 			schedule_delayed_work(&disc->disc_work, delay);
 		} else
 			fc_disc_done(disc, DISC_EV_FAILED);
+	} else if (PTR_ERR(fp) == -FC_EX_CLOSED) {
+		/*
+		 * if discovery fails due to lport reset, clear
+		 * pending flag so that subsequent discovery can
+		 * continue
+		 */
+		disc->pending = 0;
 	}
 }
 
@@ -353,7 +357,7 @@ static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp)
 static void fc_disc_gpn_ft_req(struct fc_disc *disc)
 {
 	struct fc_frame *fp;
-	struct fc_lport *lport = disc->lport;
+	struct fc_lport *lport = fc_disc_lport(disc);
 
 	WARN_ON(!fc_lport_test_ready(lport));
 
@@ -396,7 +400,7 @@ static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len)
 	struct fc_rport_identifiers ids;
 	struct fc_rport_priv *rdata;
 
-	lport = disc->lport;
+	lport = fc_disc_lport(disc);
 	disc->seq_count++;
 
 	/*
@@ -685,14 +689,13 @@ static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp)
  * fc_disc_stop() - Stop discovery for a given lport
  * @lport: The local port that discovery should stop on
  */
-void fc_disc_stop(struct fc_lport *lport)
+static void fc_disc_stop(struct fc_lport *lport)
 {
 	struct fc_disc *disc = &lport->disc;
 
-	if (disc) {
+	if (disc->pending)
 		cancel_delayed_work_sync(&disc->disc_work);
-		fc_disc_stop_rports(disc);
-	}
+	fc_disc_stop_rports(disc);
 }
 
 /**
@@ -702,19 +705,20 @@ void fc_disc_stop(struct fc_lport *lport)
  * This function will block until discovery has been
  * completely stopped and all rports have been deleted.
  */
-void fc_disc_stop_final(struct fc_lport *lport)
+static void fc_disc_stop_final(struct fc_lport *lport)
 {
 	fc_disc_stop(lport);
 	lport->tt.rport_flush_queue();
 }
 
 /**
- * fc_disc_init() - Initialize the discovery layer for a local port
- * @lport: The local port that needs the discovery layer to be initialized
+ * fc_disc_config() - Configure the discovery layer for a local port
+ * @lport: The local port that needs the discovery layer to be configured
+ * @priv: Private data structre for users of the discovery layer
  */
-int fc_disc_init(struct fc_lport *lport)
+void fc_disc_config(struct fc_lport *lport, void *priv)
 {
-	struct fc_disc *disc;
+	struct fc_disc *disc = &lport->disc;
 
 	if (!lport->tt.disc_start)
 		lport->tt.disc_start = fc_disc_start;
@@ -729,12 +733,21 @@ int fc_disc_init(struct fc_lport *lport)
 		lport->tt.disc_recv_req = fc_disc_recv_req;
 
 	disc = &lport->disc;
+
+	disc->priv = priv;
+}
+EXPORT_SYMBOL(fc_disc_config);
+
+/**
+ * fc_disc_init() - Initialize the discovery layer for a local port
+ * @lport: The local port that needs the discovery layer to be initialized
+ */
+void fc_disc_init(struct fc_lport *lport)
+{
+	struct fc_disc *disc = &lport->disc;
+
 	INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout);
 	mutex_init(&disc->disc_mutex);
 	INIT_LIST_HEAD(&disc->rports);
-
-	disc->lport = lport;
-
-	return 0;
 }
 EXPORT_SYMBOL(fc_disc_init);