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Commit b5c8467d authored by Fugang Duan's avatar Fugang Duan Committed by Sasha Levin
Browse files

net: fec_ptp: add clock rate zero check 



commit cb3cefe3f3f8af27c6076ef7d1f00350f502055d upstream.

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

Fixes: commit 85bd1798 ("net: fec: fix spin_lock dead lock")
Signed-off-by: default avatarFugang Duan <fugang.duan@nxp.com>
Signed-off-by: default avatarJoakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b838dfa4

drivers/net/ethernet/freescale/fec_ptp.c

+4 −0
Original line number Diff line number Diff line
@@ -597,6 +597,10 @@ void fec_ptp_init(struct platform_device *pdev, int irq_idx) 
	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);