Driver core: fix "driver" symlink timing
Create the "driver" link before the child device may be created by the probing logic. This makes it possible for userspace (udev), to determine the driver property of the parent device, at the time the child device is created. Signed-off-by: Kay Sievers <kay.sievers@novell.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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116af37820
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1901fb2604
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@ -26,6 +26,50 @@
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#define to_drv(node) container_of(node, struct device_driver, kobj.entry)
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static void driver_bound(struct device *dev)
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{
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if (klist_node_attached(&dev->knode_driver)) {
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printk(KERN_WARNING "%s: device %s already bound\n",
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__FUNCTION__, kobject_name(&dev->kobj));
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return;
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}
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pr_debug("bound device '%s' to driver '%s'\n",
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dev->bus_id, dev->driver->name);
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if (dev->bus)
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blocking_notifier_call_chain(&dev->bus->bus_notifier,
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BUS_NOTIFY_BOUND_DRIVER, dev);
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klist_add_tail(&dev->knode_driver, &dev->driver->klist_devices);
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}
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static int driver_sysfs_add(struct device *dev)
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{
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int ret;
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ret = sysfs_create_link(&dev->driver->kobj, &dev->kobj,
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kobject_name(&dev->kobj));
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if (ret == 0) {
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ret = sysfs_create_link(&dev->kobj, &dev->driver->kobj,
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"driver");
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if (ret)
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sysfs_remove_link(&dev->driver->kobj,
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kobject_name(&dev->kobj));
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}
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return ret;
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}
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static void driver_sysfs_remove(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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if (drv) {
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sysfs_remove_link(&drv->kobj, kobject_name(&dev->kobj));
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sysfs_remove_link(&dev->kobj, "driver");
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}
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}
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/**
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* device_bind_driver - bind a driver to one device.
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* @dev: device.
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@ -42,32 +86,8 @@
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*/
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int device_bind_driver(struct device *dev)
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{
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int ret;
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if (klist_node_attached(&dev->knode_driver)) {
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printk(KERN_WARNING "%s: device %s already bound\n",
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__FUNCTION__, kobject_name(&dev->kobj));
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return 0;
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}
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pr_debug("bound device '%s' to driver '%s'\n",
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dev->bus_id, dev->driver->name);
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if (dev->bus)
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blocking_notifier_call_chain(&dev->bus->bus_notifier,
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BUS_NOTIFY_BOUND_DRIVER, dev);
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klist_add_tail(&dev->knode_driver, &dev->driver->klist_devices);
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ret = sysfs_create_link(&dev->driver->kobj, &dev->kobj,
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kobject_name(&dev->kobj));
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if (ret == 0) {
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ret = sysfs_create_link(&dev->kobj, &dev->driver->kobj,
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"driver");
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if (ret)
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sysfs_remove_link(&dev->driver->kobj,
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kobject_name(&dev->kobj));
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}
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return ret;
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driver_bound(dev);
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return driver_sysfs_add(dev);
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}
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struct stupid_thread_structure {
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@ -90,30 +110,32 @@ static int really_probe(void *void_data)
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drv->bus->name, drv->name, dev->bus_id);
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dev->driver = drv;
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if (driver_sysfs_add(dev)) {
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printk(KERN_ERR "%s: driver_sysfs_add(%s) failed\n",
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__FUNCTION__, dev->bus_id);
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goto probe_failed;
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}
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if (dev->bus->probe) {
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ret = dev->bus->probe(dev);
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if (ret) {
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dev->driver = NULL;
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if (ret)
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goto probe_failed;
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}
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} else if (drv->probe) {
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ret = drv->probe(dev);
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if (ret) {
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dev->driver = NULL;
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if (ret)
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goto probe_failed;
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}
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}
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if (device_bind_driver(dev)) {
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printk(KERN_ERR "%s: device_bind_driver(%s) failed\n",
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__FUNCTION__, dev->bus_id);
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/* How does undo a ->probe? We're screwed. */
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}
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driver_bound(dev);
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ret = 1;
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pr_debug("%s: Bound Device %s to Driver %s\n",
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drv->bus->name, dev->bus_id, drv->name);
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goto done;
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probe_failed:
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driver_sysfs_remove(dev);
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dev->driver = NULL;
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if (ret == -ENODEV || ret == -ENXIO) {
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/* Driver matched, but didn't support device
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* or device not found.
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@ -289,7 +311,7 @@ static void __device_release_driver(struct device * dev)
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drv = dev->driver;
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if (drv) {
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get_driver(drv);
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sysfs_remove_link(&drv->kobj, kobject_name(&dev->kobj));
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driver_sysfs_remove(dev);
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sysfs_remove_link(&dev->kobj, "driver");
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klist_remove(&dev->knode_driver);
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