On Thu, 29 Mar 2007, Maxim wrote:
> On Thursday 29 March 2007 07:08:58 Linus Torvalds wrote:
> >
> > (Or, better yet, shouldn't we set "boot_hpet_disable" when we decide not
> > to use the HPET, and set hpet_virt_address to NULL?)
>
> This is done here
>
> out_nohpet:
> iounmap(hpet_virt_address);
> hpet_virt_address = NULL;
No, that only clears hpet_virt_address, and thus makes all subsequent
"hpet_readl()" and "hpet_writel()" calls oops.
But it doesn't actually *tell* anybody that the HPET is disabled, so if
you later on do
if (is_hpet_capable()) {
time = hpet_readl(..);
..
you will just Oops!
So as far as I can see, even with your latest patch, if hpet_enable()
fails (and triggers the "goto out_nohpet" cases), you'll just oops
immediately when you try to suspend/resume the HPET.
THAT was what I meant - when we clear hpet_virt_address, we should also
tell all potential subsequent users that the HPET is not there!
Linus
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