[PATCH 14/16] Driver core: Don't ignore error returns from probing

Greg KH
2006-10-18T20:13:52Z

From: Alan Stern <stern@rowland.harvard.edu>

This patch (as797) fixes device_add() in the driver core. It needs to
pay attention when the driver for a new device reports an error.

At the same time, since bus_remove_device() undoes the effects of both
bus_add_device() and bus_attach_device(), it needs to check whether
the bus_attach_device step failed.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/base/bus.c | 6 ++++--
drivers/base/core.c | 5 ++++-
2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index d516f7d..d7c5ea2 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -439,8 +439,10 @@ void bus_remove_device(struct device * d
sysfs_remove_link(&dev->kobj, "bus");
sysfs_remove_link(&dev->bus->devices.kobj, dev->bus_id);
device_remove_attrs(dev->bus, dev);
- dev->is_registered = 0;
- klist_del(&dev->knode_bus);
+ if (dev->is_registered) {
+ dev->is_registered = 0;
+ klist_del(&dev->knode_bus);
+ }
pr_debug("bus %s: remove device %s\n", dev->bus->name, dev->bus_id);
device_release_driver(dev);
put_bus(dev->bus);
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 41f3dca..68ad11a 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -479,7 +479,8 @@ int device_add(struct device *dev)
if ((error = bus_add_device(dev)))
goto BusError;
kobject_uevent(&dev->kobj, KOBJ_ADD);
- bus_attach_device(dev);
+ if ((error = bus_attach_device(dev)))
+ goto AttachError;
if (parent)
klist_add_tail(&dev->knode_parent, &parent->klist_children);

@@ -498,6 +499,8 @@ 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:
--
1.4.2.4