linux-kernel - Re: [PATCH v6.6] net: stmmac: make sure that ptp

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Message-ID: <2026010804-evidence-cheek-430a@gregkh>
Date: Thu, 8 Jan 2026 12:09:17 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: Rahul Sharma <black.hawk@....com>
Cc: stable@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alexis Lothoré <alexis.lothore@...tlin.com>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH v6.6] net: stmmac: make sure that ptp_rate is not 0
 before configuring EST

On Mon, Dec 29, 2025 at 08:31:17AM +0800, Rahul Sharma wrote:
> From: Alexis Lothoré <alexis.lothore@...tlin.com>
> 
> If the ptp_rate recorded earlier in the driver happens to be 0, this
> bogus value will propagate up to EST configuration, where it will
> trigger a division by 0.
> 
> Prevent this division by 0 by adding the corresponding check and error
> code.
> 
> Suggested-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
> Signed-off-by: Alexis Lothoré <alexis.lothore@...tlin.com>
> Fixes: 8572aec3d0dc ("net: stmmac: Add basic EST support for XGMAC")
> Link: https://patch.msgid.link/20250529-stmmac_tstamp_div-v4-2-d73340a794d5@bootlin.com
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> [ The context change is due to the commit c3f3b97238f6
> ("net: stmmac: Refactor EST implementation")
> which is irrelevant to the logic of this patch. ]
> Signed-off-by: Rahul Sharma <black.hawk@....com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac5.c        | 5 +++++
>  drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c | 5 +++++
>  2 files changed, 10 insertions(+)

What is the git id of this commit in Linus's tree?

thanks,

greg k-h