From b230b8a298d1f042fb501a4bbdbc954c927e9ff1 Mon Sep 17 00:00:00 2001
From: James Smart <james.smart@emulex.com>
Date: Fri, 31 May 2013 17:05:27 -0400
Subject: [PATCH] [SCSI] lpfc 8.3.40: Fixed issue mailbox wait routine failed
 to issue dump memory mbox command

Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
---
 drivers/scsi/lpfc/lpfc_sli.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 876e61b5036b..bb78e4d45db9 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -10092,12 +10092,13 @@ lpfc_sli_issue_mbox_wait(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmboxq,
 			 uint32_t timeout)
 {
 	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(done_q);
+	MAILBOX_t *mb = NULL;
 	int retval;
 	unsigned long flag;
 
-	/* The caller must leave context1 empty. */
+	/* The caller might set context1 for extended buffer */
 	if (pmboxq->context1)
-		return MBX_NOT_FINISHED;
+		mb = (MAILBOX_t *)pmboxq->context1;
 
 	pmboxq->mbox_flag &= ~LPFC_MBX_WAKE;
 	/* setup wake call as IOCB callback */
@@ -10113,7 +10114,8 @@ lpfc_sli_issue_mbox_wait(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmboxq,
 				msecs_to_jiffies(timeout * 1000));
 
 		spin_lock_irqsave(&phba->hbalock, flag);
-		pmboxq->context1 = NULL;
+		/* restore the possible extended buffer for free resource */
+		pmboxq->context1 = (uint8_t *)mb;
 		/*
 		 * if LPFC_MBX_WAKE flag is set the mailbox is completed
 		 * else do not free the resources.
@@ -10126,6 +10128,9 @@ lpfc_sli_issue_mbox_wait(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmboxq,
 			pmboxq->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
 		}
 		spin_unlock_irqrestore(&phba->hbalock, flag);
+	} else {
+		/* restore the possible extended buffer for free resource */
+		pmboxq->context1 = (uint8_t *)mb;
 	}
 
 	return retval;
-- 
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