[SCSI] libfc: avoid exchanges collision during lport reset

Currently timer delay is large and is using msleep to avoid
avoid exchanges collision across lport reset, so instead
do this by initializing exches pool indexes during
reset also.

Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Tested-by: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/libfc/fc_exch.c

diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c
index 81235f3..1b22130 100644
--- a/drivers/scsi/libfc/fc_exch.c
+++ b/drivers/scsi/libfc/fc_exch.c
@@ -1793,6 +1793,9 @@
 			goto restart;
 		}
 	}
+	pool->next_index = 0;
+	pool->left = FC_XID_UNKNOWN;
+	pool->right = FC_XID_UNKNOWN;
 	spin_unlock_bh(&pool->lock);
 }
 
@@ -2281,6 +2284,7 @@
 		goto free_mempool;
 	for_each_possible_cpu(cpu) {
 		pool = per_cpu_ptr(mp->pool, cpu);
+		pool->next_index = 0;
 		pool->left = FC_XID_UNKNOWN;
 		pool->right = FC_XID_UNKNOWN;
 		spin_lock_init(&pool->lock);

drivers/scsi/libfc/fc_lport.c

diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
index 628f347..e0fb891 100644
--- a/drivers/scsi/libfc/fc_lport.c
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -1030,16 +1030,8 @@
 			   FCH_EVT_LIPRESET, 0);
 	fc_vports_linkchange(lport);
 	fc_lport_reset_locked(lport);
-	if (lport->link_up) {
-		/*
-		 * Wait upto resource allocation time out before
-		 * doing re-login since incomplete FIP exchanged
-		 * from last session may collide with exchanges
-		 * in new session.
-		 */
-		msleep(lport->r_a_tov);
+	if (lport->link_up)
 		fc_lport_enter_flogi(lport);
-	}
 }
 
 /**