[PATCH] PCI: Reorder some initialization code to allow resources to be proper allocated.
On Tuesday, August 31, 2004, Linus Torvalds wrote:
> That list per se obviously looks ok by me, although I'd worry that some
> other fs_initcall depends on the ACPI stuff having been run (ie while the
> abover ordering is great, I worry that some _other_ part doesn't fit in
> the above ordering). Doing a quick check finds "chr_dev_init()", for
> example, which will do fbmem_init(), which might depend on the ACPI/PnP
> stuff having run already.
>
> So it _might_ be safer to make this ordering more explicit, rather than
Yes, I agree. The problem is there isn't a straightforward method for
it. It possibly is hard to get it.
> depending on the different phases of the initcalls. But I'd happily be
> proven wrogn with some simple argument for why this is guaranteed to be
> ok.. For example, maybe ACPI and PnP is linked before chr/mem.c, in which
> case it should all be ok.
Original PCI assign resources code is the last 'subsys_initcall'
according to the makefile, so move some code of it to 'fs_initcall'
(just below 'subsystem_initcall') should be ok. As you said, ACPI and
PnP is linked before chr/mem.c. The method requires all other
'fs_initcall' don't touch PCI resources, since
'pcibios_assign_resources' is a 'fs_initcall' and maybe don't run, but
it looks ok currently. Again, I will be appreciated if we can find a
solution to make the ordering explicit.
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