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 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>

diff --git a/drivers/net/ethernet/freescale/fec_ptp.c b/drivers/net/ethernet/freescale/fec_ptp.c
index da04e61d819a6ef9c94521a3d4f71940d8e0fda8..3b54a37e780eb2e436099e904839665506c09667 100644 (file)
--- a/drivers/net/ethernet/freescale/fec_ptp.c
+++ b/drivers/net/ethernet/freescale/fec_ptp.c
@@ -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);