linux-kernel - Re: [PATCH net-next] net: stmmac: Convert open-coded register polling to helper macro

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Message-ID: <20250926172611.32d60205@kernel.org>
Date: Fri, 26 Sep 2025 17:26:11 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Furong Xu <0x1207@...il.com>
Cc: netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Andrew
 Lunn <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Maxime
 Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue
 <alexandre.torgue@...s.st.com>, xfr@...look.com
Subject: Re: [PATCH net-next] net: stmmac: Convert open-coded register
 polling to helper macro

On Wed, 24 Sep 2025 23:22:17 +0800 Furong Xu wrote:
>  	writel(addend, ioaddr + PTP_TAR);
>  	/* issue command to update the addend value */
> @@ -144,23 +143,15 @@ static int config_addend(void __iomem *ioaddr, u32 addend)
>  	writel(value, ioaddr + PTP_TCR);
>  
>  	/* wait for present addend update to complete */
> -	limit = 10;
> -	while (limit--) {
> -		if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSADDREG))
> -			break;
> -		mdelay(10);
> -	}
> -	if (limit < 0)
> -		return -EBUSY;
> -
> -	return 0;
> +	return readl_poll_timeout_atomic(ioaddr + PTP_TCR, value,
> +				!(value & PTP_TCR_TSADDREG),

Why the strange alignment ? I think you can start the continuation line
under the opening bracket and still easily fit in 80 chars?

> +				10, 100000);

You say in the commit message "no functional changes intended"
but you changed the frequency of polling from 10msec to 10usec.
Seems like a reasonable change, but the commit message is lying.
-- 
pw-bot: cr