linux-kernel - Re: [PATCH linux-next v2] net: stmmac: use sysfs

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Message-ID: <Y4ZOpQL3daLPqXXl@lunn.ch>
Date:   Tue, 29 Nov 2022 19:25:41 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     yang.yang29@....com.cn
Cc:     peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, mcoquelin.stm32@...il.com,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        xu.panda@....com.cn, Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH linux-next v2] net: stmmac: use sysfs_streq() instead of
 strncmp()

On Tue, Nov 29, 2022 at 03:02:28PM +0800, yang.yang29@....com.cn wrote:
> From: Xu Panda <xu.panda@....com.cn>
> 
> Replace the open-code with sysfs_streq().
> 
> ---
> change for v2
>  - fix the mistake of redundant parameter.

> -		} else if (!strncmp(opt, "tc:", 3)) {
> +		} else if (sysfs_streq(opt, "tc:")) {
>  			if (kstrtoint(opt + 3, 0, &tc))
>  				goto err;

Vladimir made the comment:

> What's even worse is that the patch is flat out wrong. The stmmac_cmdline_opt()
> function does not parse sysfs input, but cmdline input such as
> "stmmaceth=tc:1,pause:1". The pattern of using strsep() followed by
> strncmp() for such strings is not unique to stmmac, it can also be found
> mainly in drivers under drivers/video/fbdev/.
> 
> With strncmp("tc:", 3), the code matches on the "tc:1" token properly.
> With sysfs_streq("tc:"), it doesn't.

It is not clear you have addressed this point.

   Andrew