netdev - Re: [PATCH V5 2/8] net: sxgbe: add basic framework for Samsung 10Gb ethernet driver

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Message-ID: <1395171314.2812.80.camel@joe-AO722>
Date:	Tue, 18 Mar 2014 12:35:14 -0700
From:	Joe Perches <joe@...ches.com>
To:	Byungho An <bh74.an@...sung.com>
Cc:	netdev@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	devicetree@...r.kernel.org, davem@...emloft.net,
	siva.kallam@...sung.com, ks.giri@...sung.com,
	ilho215.lee@...sung.com, vipul.pandya@...sung.com
Subject: Re: [PATCH V5 2/8] net: sxgbe: add basic framework for Samsung 10Gb
 ethernet driver

On Tue, 2014-03-18 at 11:19 -0700, Byungho An wrote:
> From: Siva Reddy <siva.kallam@...sung.com>
> 
> This patch adds support for Samsung 10Gb ethernet driver(sxgbe).

More trivia, nothing that should stop this from
being applied and updated later...

> diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_mdio.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_mdio.c
[]
> +static int sxgbe_mdio_busy_wait(void __iomem *ioaddr, unsigned int mii_data)
> +{
> +	unsigned long cur_time;
> +	unsigned long fin_time = jiffies + 3 * HZ; /* 30 ms */

This is actually 3 seconds.
If this should be 30ms, then use msecs_to_jiffies(30)

> +
> +	do {
> +		cur_time = jiffies;
> +		if (readl(ioaddr + mii_data) & SXGBE_MII_BUSY)
> +			cpu_relax();
> +		else
> +			return 0;
> +	} while (!time_after_eq(cur_time, fin_time));
> +
> +	return -EBUSY;
> +}

This may be clearer as

	unsigned long fin_time = jiffies + msecs_to_jiffies(30);
 
	while (!time_after(jiffies, fin_time))
		if (!(readl(ioaddr + mii_data) & SXGBE_MII_BUSY))
			return 0;
		cpu_relax();
	}

	return -EBUSY;


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