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Commit ca2b94ba authored by Hannes Reinecke's avatar Hannes Reinecke Committed by Greg Kroah-Hartman
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[PATCH] driver core: fix error handling in bus_add_device 



The error handling in bus_add_device() and device_attach() is simply
non-existing. This patch propagates any error from device_attach to
the upper layers to allow for a proper recovery.

From: Hannes Reinecke <hare@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent acaefc25

drivers/base/bus.c

+8 −5
Original line number Diff line number Diff line
@@ -270,12 +270,15 @@ int bus_add_device(struct device * dev) 


	if (bus) {

		pr_debug("bus %s: add device %s\n", bus->name, dev->bus_id);

		device_attach(dev);

		error = device_attach(dev);

		klist_add_tail(&bus->klist_devices, &dev->knode_bus);

		device_add_attrs(bus, dev);

		if (error >= 0)

			error = device_add_attrs(bus, dev);

		if (!error) {

			sysfs_create_link(&bus->devices.kobj, &dev->kobj, dev->bus_id);

			sysfs_create_link(&dev->kobj, &dev->bus->subsys.kset.kobj, "bus");

		}

	}

	return error;

}
@@ -394,7 +397,7 @@ static int bus_rescan_devices_helper(struct device *dev, void *data) 
{

	int *count = data;



	if (!dev->driver && device_attach(dev))

	if (!dev->driver && (device_attach(dev) > 0))

		(*count)++;



	return 0;

drivers/base/dd.c

+2 −1
Original line number Diff line number Diff line
@@ -119,7 +119,8 @@ static int __device_attach(struct device_driver * drv, void * data) 
 *	driver_probe_device() for each pair. If a compatible

 *	pair is found, break out and return.

 *

 *	Returns 1 if the device was bound to a driver; 0 otherwise.

 *	Returns 1 if the device was bound to a driver;

 *	0 if no matching device was found; error code otherwise.

 */

int device_attach(struct device * dev)

{