From: Vaios Papadimitriou <vaios.papadimitriou@emulex.com>
Date: Tue, 28 Aug 2012 22:46:21 +0000 (-0700)
Subject: scsi/lpfc: Fix driver crash during back-to-back ramp events
X-Git-Tag: v2.6.39-400.9.0~314^2~34
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=e8229e678899673f910c72e900b8280efa95e9a8;p=users%2Fjedix%2Flinux-maple.git

scsi/lpfc: Fix driver crash during back-to-back ramp events

commit id: 75ad83a452116c00c092bdc4c842c4401cd24080

Signed-off-by: Jerry Snitselaar <jerry.snitselaar@oracle.com>
---

diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index 64ca7033a7e4..48f93649fbeb 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -398,6 +398,14 @@ lpfc_ramp_down_queue_handler(struct lpfc_hba *phba)
 	num_rsrc_err = atomic_read(&phba->num_rsrc_err);
 	num_cmd_success = atomic_read(&phba->num_cmd_success);
 
+	/*
+	 * The error and success command counters are global per
+	 * driver instance.  If another handler has already
+	 * operated on this error event, just exit.
+	 */
+	if (num_rsrc_err == 0)
+		return;
+
 	vports = lpfc_create_vport_work_array(phba);
 	if (vports != NULL)
 		for (i = 0; i <= phba->max_vports && vports[i] != NULL; i++) {