linux-kernel - [PATCH 4.4 048/192] [PATCH 049/135] lpfc: Fix FCF Infinite loop in lpfc_sli4_fcf_rr_next_index

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Date:   Mon, 12 Sep 2016 18:59:17 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dick Kennedy <dick.kennedy@...gotech.com>,
        James Smart <james.smart@...gotech.com>,
        Hannes Reinicke <hare@...e.de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.4 048/192] [PATCH 049/135] lpfc: Fix FCF Infinite loop in lpfc_sli4_fcf_rr_next_index_get.

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit f5cb5304eb26d307c9b30269fb0e007e0b262b7d ]

Fix FCF Infinite loop in lpfc_sli4_fcf_rr_next_index_get.

Signed-off-by: Dick Kennedy <dick.kennedy@...gotech.com>
Signed-off-by: James Smart <james.smart@...gotech.com>
Reviewed-by: Hannes Reinicke <hare@...e.de>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/lpfc/lpfc_sli.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -16173,7 +16173,7 @@ fail_fcf_read:
 }
 
 /**
- * lpfc_check_next_fcf_pri
+ * lpfc_check_next_fcf_pri_level
  * phba pointer to the lpfc_hba struct for this port.
  * This routine is called from the lpfc_sli4_fcf_rr_next_index_get
  * routine when the rr_bmask is empty. The FCF indecies are put into the
@@ -16329,8 +16329,12 @@ next_priority:
 
 	if (next_fcf_index < LPFC_SLI4_FCF_TBL_INDX_MAX &&
 		phba->fcf.fcf_pri[next_fcf_index].fcf_rec.flag &
-		LPFC_FCF_FLOGI_FAILED)
+		LPFC_FCF_FLOGI_FAILED) {
+		if (list_is_singular(&phba->fcf.fcf_pri_list))
+			return LPFC_FCOE_FCF_NEXT_NONE;
+
 		goto next_priority;
+	}
 
 	lpfc_printf_log(phba, KERN_INFO, LOG_FIP,
 			"2845 Get next roundrobin failover FCF (x%x)\n",