From 9bcab7b0b3cf02a5b887a39a262a8f62088f5717 Mon Sep 17 00:00:00 2001

From: Fugang Duan <fugang.duan@nxp.com>

Date: Wed, 16 Jun 2021 17:14:25 +0800

Subject: [PATCH 10/16] net: fec_ptp: add clock rate zero check

Git-commit: cb3cefe3f3f8af27c6076ef7d1f00350f502055d

Patch-mainline: v5.13-rc7

References: git-fixes

Add clock rate zero check to fix coverity issue of "divide by 0".

Fixes: commit 85bd1798b24a ("net: fec: fix spin_lock dead lock")

Signed-off-by: Fugang Duan <fugang.duan@nxp.com>

Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>

Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>

---

 drivers/net/ethernet/freescale/fec_ptp.c | 4 ++++

 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/freescale/fec_ptp.c b/drivers/net/ethernet/freescale/fec_ptp.c

index 6ebad3fac81d..07a471144bfe 100644

--- a/drivers/net/ethernet/freescale/fec_ptp.c

+++ b/drivers/net/ethernet/freescale/fec_ptp.c

@@ -579,6 +579,10 @@ void fec_ptp_init(struct platform_device *pdev)

 	fep->ptp_caps.enable = fec_ptp_enable;

 	fep->cycle_speed = clk_get_rate(fep->clk_ptp);

+	if (!fep->cycle_speed) {

+		fep->cycle_speed = NSEC_PER_SEC;

+		dev_err(&fep->pdev->dev, "clk_ptp clock rate is zero\n");

+	}

 	fep->ptp_inc = NSEC_PER_SEC / fep->cycle_speed;

 	spin_lock_init(&fep->tmreg_lock);

-- 

2.16.4