netdev - Re: [PATCH] e1000e: Populate entire system_counterval_t in get_time

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Message-ID: <87ldokuf11.ffs@tglx>
Date: Sat, 19 Jul 2025 22:00:42 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Markus Blöchl <markus@...chl.de>, Tony Nguyen
 <anthony.l.nguyen@...el.com>, Przemek Kitszel
 <przemyslaw.kitszel@...el.com>, Richard Cochran <richardcochran@...il.com>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
 <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 markus.bloechl@...tronik.com, John Stultz <jstultz@...gle.com>,
 intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] e1000e: Populate entire system_counterval_t in
 get_time_fn() callback

On Wed, Jul 09 2025 at 16:34, Markus Blöchl wrote:

> get_time_fn() callback implementations are expected to fill out the
> entire system_counterval_t struct as it may be initially uninitialized.
>
> This broke with the removal of convert_art_to_tsc() helper functions
> which left use_nsecs uninitialized.
>
> Assign the entire struct again.
>
> Fixes: bd48b50be50a ("e1000e: Replace convert_art_to_tsc()")
> Cc: stable@...r.kernel.org
> ---
> Notes:
>
> Related-To: <https://lore.kernel.org/lkml/txyrr26hxe3xpq3ebqb5ewkgvhvp7xalotaouwludjtjifnah2@7tmgczln4aoo/>
> ---
>  drivers/net/ethernet/intel/e1000e/ptp.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/e1000e/ptp.c b/drivers/net/ethernet/intel/e1000e/ptp.c
> index ea3c3eb2ef2020d513d49c1368679f27d17edb04..f01506504ee3a11822930115e9ed07661d81532c 100644
> --- a/drivers/net/ethernet/intel/e1000e/ptp.c
> +++ b/drivers/net/ethernet/intel/e1000e/ptp.c
> @@ -124,8 +124,11 @@ static int e1000e_phc_get_syncdevicetime(ktime_t *device,
>  	sys_cycles = er32(PLTSTMPH);
>  	sys_cycles <<= 32;
>  	sys_cycles |= er32(PLTSTMPL);
> -	system->cycles = sys_cycles;
> -	system->cs_id = CSID_X86_ART;
> +	*system = (struct system_counterval_t) {
> +		.cycles = sys_cycles,
> +		.cs_id = CSID_X86_ART,
> +		.use_nsecs = false,

This is again the wrong place to fix this.

> +	};
>  
>  	return 0;
>  }
>
> ---
> base-commit: 733923397fd95405a48f165c9b1fbc8c4b0a4681
> change-id: 20250709-e1000e_crossts-7745674f682a
>
> Best regards,