Re: pci bridge suspend/resume (Re: PCI not restored correctly after suspend to ram)

[Russell King <rmk-pci-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>]

On Tue, Mar 30, 2004 at 10:03:35PM -0800, Nate Lawson wrote:
> This can screw up devices that don't allow full shutdown (i.e. require
> BIOS initialization).  A two-pass approach works better.  First pass
> allows the driver to match an ID but not initialize anything.  Second
> allocates resources like memory, IRQs, etc.

Consider the case where the generic driver is built into the kernel,
and the specific driver is a module.

The generic driver will have been initialised long before the specific
driver is known to the system.  So doing a first-pass over existing
drivers to find the "best match" and then initialising on a second
pass Just Doesn't Work(tm).

Also, if what you say is true, these device drivers can only ever be
inserted and never removed and re-inserted - which would be a driver
bug.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 PCMCIA      - http://pcmcia.arm.linux.org.uk/
                 2.6 Serial core


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