driver core: don't fail attaching the device if it cannot be bound

Don't fail bus_attach_device() if the device cannot be bound.

If dev->driver has been specified, reset it to NULL if device_bind_driver()
failed and add the device as an unbound device.  As a result,
bus_attach_device() now cannot fail, and we can remove some checking from
device_add().

Also remove an unneeded check in bus_rescan_devices_helper().

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/base.h b/drivers/base/base.h
index de7e144..d597f26 100644 (file)
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -16,7 +16,7 @@ extern int cpu_dev_init(void);
 extern int attribute_container_init(void);
 
 extern int bus_add_device(struct device * dev);
-extern int bus_attach_device(struct device * dev);
+extern void bus_attach_device(struct device * dev);
 extern void bus_remove_device(struct device * dev);
 extern struct bus_type *get_bus(struct bus_type * bus);
 extern void put_bus(struct bus_type * bus);

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 9df2e6d..20b6dc8 100644 (file)
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -447,7 +447,7 @@ out_put:
  *     - Add device to bus's list of devices.
  *     - Try to attach to driver.
  */
-int bus_attach_device(struct device * dev)
+void bus_attach_device(struct device * dev)
 {
        struct bus_type *bus = dev->bus;
        int ret = 0;
@@ -456,13 +456,12 @@ int bus_attach_device(struct device * dev)
                dev->is_registered = 1;
                if (bus->drivers_autoprobe)
                        ret = device_attach(dev);
-               if (ret >= 0) {
+               WARN_ON(ret < 0);
+               if (ret >= 0)
                        klist_add_tail(&dev->knode_bus, &bus->klist_devices);
-                       ret = 0;
-               } else
+               else
                        dev->is_registered = 0;
        }
-       return ret;
 }
 
 /**
@@ -669,8 +668,6 @@ static int __must_check bus_rescan_devices_helper(struct device *dev,
                ret = device_attach(dev);
                if (dev->parent)
                        up(&dev->parent->sem);
-               if (ret > 0)
-                       ret = 0;
        }
        return ret < 0 ? ret : 0;
 }

diff --git a/drivers/base/core.c b/drivers/base/core.c
index bffb69e..be6aeb4 100644 (file)
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -677,8 +677,7 @@ int device_add(struct device *dev)
                goto BusError;
        if (!dev->uevent_suppress)
                kobject_uevent(&dev->kobj, KOBJ_ADD);
-       if ((error = bus_attach_device(dev)))
-               goto AttachError;
+       bus_attach_device(dev);
        if (parent)
                klist_add_tail(&dev->knode_parent, &parent->klist_children);
 
@@ -697,8 +696,6 @@ int device_add(struct device *dev)
        kfree(class_name);
        put_device(dev);
        return error;
- AttachError:
-       bus_remove_device(dev);
  BusError:
        device_pm_remove(dev);
  PMError:

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 616b4bb..18dba8e 100644 (file)
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -232,7 +232,7 @@ static int device_probe_drivers(void *data)
  *
  *     Returns 1 if the device was bound to a driver;
  *     0 if no matching device was found or multithreaded probing is done;
- *     error code otherwise.
+ *     -ENODEV if the device is not registered.
  *
  *     When called for a USB interface, @dev->parent->sem must be held.
  */
@@ -246,6 +246,10 @@ int device_attach(struct device * dev)
                ret = device_bind_driver(dev);
                if (ret == 0)
                        ret = 1;
+               else {
+                       dev->driver = NULL;
+                       ret = 0;
+               }
        } else {
                if (dev->bus->multithread_probe)
                        probe_task = kthread_run(device_probe_drivers, dev,