Subject: Re: lkm for pci device
To: None <>
From: Nathan J. Williams <>
List: tech-kern
Date: 07/03/2004 17:37:31
Matthias Drochner <> writes:

> If you ask me, pci_find_device() should die completely. It doesn't
> fit into the autoconf framework.
> There is almost everything there to have driver LKMs plug in smoothly.
> In the PCI case, it is just that the bus enumeration code should
> keep track which devices are already handled by drivers (a simple
> bitmask per bus would do it), and that pci_enumerate_bus() could
> be a bit friendlier to LKMs.

Amen. I've been thinking this for a while. It also would make it
possible to detach drivers from devices, even for drivers compiled
into the kernel and non-removable devices.

It seems like what you want for direct-config buses is:

 - the bus to track what subdevices have what drivers attached, and
   which subdevices have nothing attached.
 - a call into the bus to re-run the probe/attach for unattached
   devices (or a particular device identifier?)
 - a call to cause a driver at a particular device to be detached (for
   unloading and trying again).

As you mention, device LKMs need some way to hook into the config
location framework.

         - Nathan