linux-kernel - RE: [PATCH] stmmac: selftest: avoid large stack usage

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Message-ID: <BN8PR12MB3266E044DDF00F227B9B191CD3890@BN8PR12MB3266.namprd12.prod.outlook.com>
Date:   Thu, 19 Sep 2019 07:58:50 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] stmmac: selftest: avoid large stack usage

From: Arnd Bergmann <arnd@...db.de>
Date: Sep/18/2019, 20:54:34 (UTC+00:00)

> +	if (!cfg || !cfg->enable) {
>  		value &= ~XGMAC_RSSE;
>  		writel(value, ioaddr + XGMAC_RSS_CTRL);
>  		return 0;
>  	}
>  
>  	for (i = 0; i < (sizeof(cfg->key) / sizeof(u32)); i++) {
> -		ret = dwxgmac2_rss_write_reg(ioaddr, true, i, *key++);
> +		if (cfg)
> +			ret = dwxgmac2_rss_write_reg(ioaddr, true, i, cfg->key[i]);
> +		else
> +			ret = dwxgmac2_rss_write_reg(ioaddr, true, i, 0);
> +
>  		if (ret)
>  			return ret;
>  	}
>  
>  	for (i = 0; i < ARRAY_SIZE(cfg->table); i++) {
> -		ret = dwxgmac2_rss_write_reg(ioaddr, false, i, cfg->table[i]);
> +		if (cfg)
> +			ret = dwxgmac2_rss_write_reg(ioaddr, false, i, cfg->table[i]);
> +		else
> +			ret = dwxgmac2_rss_write_reg(ioaddr, false, i, 0);
> +

I don't get these "if (cfg)" checks. You already check earlier if cfg is 
NULL and return if so. I don't think you need these extra checks.

Also, your subject line should be something like: "net: stmmac: 
selftests: ..."

---
Thanks,
Jose Miguel Abreu