linux-kernel - about probing a device

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Date:	Wed, 10 Oct 2007 09:39:44 +0800
From:	wit <is01kzh@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: about probing a device

Hi,
I found these routines in the kernel, does this means only one driver
can be matched to a device? What if two drivers both can drive the
device, like sd & sg in scsi subsystem?

static int device_attach(struct device * dev)
{
 	struct bus_type * bus = dev->bus;
	struct list_head * entry;
	int error;

	if (dev->driver) {
		device_bind_driver(dev);
		return 1;
	}

	if (bus->match) {
		list_for_each(entry, &bus->drivers.list) {
			struct device_driver * drv = to_drv(entry);
			error = bus_match(dev, drv);
			if (!error)
				/* success, driver matched */
				return 1;
			if (error != -ENODEV && error != -ENXIO)
				/* driver matched but the probe failed */
				printk(KERN_WARNING
				    "%s: probe of %s failed with error %d\n",
				    drv->name, dev->bus_id, error);
		}
	}

	return 0;
}

void driver_attach(struct device_driver * drv)
{
	struct bus_type * bus = drv->bus;
	struct list_head * entry;
	int error;

	if (!bus->match)
		return;

	list_for_each(entry, &bus->devices.list) {
		struct device * dev = container_of(entry, struct device, bus_list);
		if (!dev->driver) {
			error = bus_match(dev, drv);
			if (error && (error != -ENODEV))
				/* driver matched but the probe failed */
				printk(KERN_WARNING
				    "%s: probe of %s failed with error %d\n",
				    drv->name, dev->bus_id, error);
		}
	}
}

Thanks
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