This is a note to let you know that I've just added the patch titled net: fec_ptp: add clock rate zero check to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-fec_ptp-add-clock-rate-zero-check.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From cb3cefe3f3f8af27c6076ef7d1f00350f502055d Mon Sep 17 00:00:00 2001 From: Fugang Duan <fugang.duan@xxxxxxx> Date: Wed, 16 Jun 2021 17:14:25 +0800 Subject: net: fec_ptp: add clock rate zero check From: Fugang Duan <fugang.duan@xxxxxxx> 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@xxxxxxx> Signed-off-by: Joakim Zhang <qiangqing.zhang@xxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/ethernet/freescale/fec_ptp.c | 4 ++++ 1 file changed, 4 insertions(+) --- 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 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); Patches currently in stable-queue which might be from fugang.duan@xxxxxxx are queue-4.9/net-fec_ptp-add-clock-rate-zero-check.patch