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net: fec_ptp: add clock rate zero check

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commit cb3cefe3f3f8af27c6076ef7d1f00350f502055d upstream.

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fugang Duan 2021-06-16 17:14:25 +08:00 committed by Greg Kroah-Hartman
parent 190ecdf53d
commit 7381c4d0bc
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/freescale/fec_ptp.c
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@ -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);