linux-kernel - Re: [PATCH v4 07/12] PCI: Introduce /sys/bus/pci/rescan

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Message-Id: <20090319023453.7467644a.akpm@linux-foundation.org>
Date:	Thu, 19 Mar 2009 02:34:53 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alex Chiang <achiang@...com>
Cc:	jbarnes@...tuousgeek.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Trent Piepho <xyzzy@...akeasy.org>
Subject: Re: [PATCH v4 07/12] PCI: Introduce /sys/bus/pci/rescan

On Wed, 18 Mar 2009 16:40:01 -0600 Alex Chiang <achiang@...com> wrote:

> +#ifdef CONFIG_HOTPLUG
> +static DEFINE_MUTEX(pci_remove_rescan_mutex);
> +static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
> +				size_t count)
> +{
> +	unsigned long val;
> +	struct pci_bus *b = NULL;
> +
> +	if (strict_strtoul(buf, 0, &val) < 0)
> +		return -EINVAL;
> +
> +	if (!capable(CAP_SYS_ADMIN))
> +		return -EPERM;
> +
> +	if (val) {
> +		mutex_lock(&pci_remove_rescan_mutex);
> +		while ((b = pci_find_next_bus(b)) != NULL)
> +			pci_rescan_bus(b);
> +		mutex_unlock(&pci_remove_rescan_mutex);
> +	}
> +	return count;
> +}
> +
> +struct bus_attribute pci_bus_attrs[] = {
> +	__ATTR(rescan, S_IWUSR, NULL, bus_rescan_store),
> +	__ATTR_NULL
> +};
> +#endif

Why CONFIG_HOTPLUG rather than CONFIG_HOTPLUG_PCI (or similar)?
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