On Mon, Nov 17, 2008 at 09:09, Yu Zhao <yu.zhao@xxxxxxxxx> wrote: > On Fri, Nov 14, 2008 at 08:55:38AM +0800, Greg KH wrote: >> There are also "conditional" attributes, which get only displayed if >> some kind of condition is met, I think you want to use those. > > The problem is the sysfs directory of the PCI device is created by the > kobject_add() in the device_add() as follows. And the static entries > bundled with the 'pci_bus_type' are created by the bus_add_device(). > Between the kobject_add() and the kobject_uevent(), we don't have any > other choice to add the dynamic entries. > > In device_add(): > > error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id); > ... > error = bus_add_device(dev); > ... > kobject_uevent(&dev->kobj, KOBJ_ADD); > > > So looks like the only way is to make the dynamic entries bundled with > the 'pci_bus_type', which means they would become static no matter the > device supports the entries (i.e. corresponding capabilities) or not. There is device_add_attrs() which is just called between the calls you mention above. Like Greg said, it can add groups, and groups have an is_visible() callback, which can be used to conditionally create attributes out of of predefined list. Kay -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
