netdev - Re: [PATCH 1/5] forcedeth: mgmt unit interface

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Message-Id: <20090130143541.4b85f22a.akpm@linux-foundation.org>
Date:	Fri, 30 Jan 2009 14:35:41 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ayaz Abdulla <aabdulla@...dia.com>
Cc:	jgarzik@...ox.com, manfred@...orfullife.com,
	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH 1/5] forcedeth: mgmt unit interface

On Fri, 30 Jan 2009 13:56:26 -0500
Ayaz Abdulla <aabdulla@...dia.com> wrote:

> +static int nv_mgmt_get_version(struct net_device *dev)
> +{
> +	struct fe_priv *np = netdev_priv(dev);
> +	u8 __iomem *base = get_hwbase(dev);
> +	u32 data_ready = readl(base + NvRegTransmitterControl);
> +	u32 data_ready2;
> +	int i;
> +
> +	writel(NVREG_MGMTUNITGETVERSION, base + NvRegMgmtUnitGetVersion);
> +	writel(data_ready ^ NVREG_XMITCTL_DATA_START, base + NvRegTransmitterControl);
> +	for (i = 0; i < 100000; i++) {
> +		data_ready2 = readl(base + NvRegTransmitterControl);
> +		if ((data_ready & NVREG_XMITCTL_DATA_READY) != (data_ready2 & NVREG_XMITCTL_DATA_READY))
> +			break;
> +		udelay(50);
> +	}
> +
> +	if (i == 100000 || (data_ready2 & NVREG_XMITCTL_DATA_ERROR))
> +		return 0;
> +
> +	np->mgmt_version = readl(base + NvRegMgmtUnitVersion) & NVREG_MGMTUNITVERSION;
> +
> +	return 1;
> +}

A five second busy-wait still sucks :(

Why not do

	start = jiffies;
	while (time_before(jiffies, start + 5*HZ)) {
		...
		schedule_timeout_uninterruptible(1);
	}

?
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