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 1231816125955141b9e3d236386c1e92bf3e4f9a..031d4b3a544c08df9d3eb6488cdc36c3260fe906 100644 (file)
--- a/drivers/net/ethernet/freescale/fec_ptp.c
+++ b/drivers/net/ethernet/freescale/fec_ptp.c
@@ -586,6 +586,10 @@ 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);