Hi Bjorn,
On Wed, 22 Aug 2012 11:02:52 -0700
Bjorn Helgaas <bhelg...@google.com> wrote:
> On Wed, Aug 22, 2012 at 12:49 AM, Feng Tang <feng.t...@intel.com> wrote:
> > Hi Fengguang,
> >
> >
> > On Wed, 22 Aug 2012 10:50:08 +0800
> > Fengguang Wu <fengguang...@intel.com> wrote:
> >
> >> Feng,
> >>
> >> > I think it's pci_get_subsys() triggered this assert:
> >> >
> >> > /*
> >> > * Oi! Can't be having __GFP_FS allocations with IRQs disabled.
> >> > */
> >> > if (DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags)))
> >> > return;
> >>
> >> It's bisected down to this commit:
> >>
> >> commit 55c844a4dd16a4d1fdc0cf2a283ec631a02ec448
> >> Author: Feng Tang <feng.t...@intel.com>
> >> AuthorDate: Wed May 30 23:15:41 2012 +0800
> >> Commit: Ingo Molnar <mi...@kernel.org>
> >> CommitDate: Wed Jun 6 12:03:23 2012 +0200
> >>
> >> x86/reboot: Fix a warning message triggered by stop_other_cpus()
> >>
> >> Thanks,
> >> Fengguang
> >
> > Thanks for the bisection.
> >
> > Revert my commit should be a solution, but can we simply make the
> > pci_device_id
> > a local on stack one instead of using sleepable kmalloc for it, as this
> > sounds fragile when pci_get_subsys get called in a late system reboot stage?
>
> I think this is a great idea. Can you make this a real patch, with a
> changelog and Signed-off-by?
Thanks and will do.
>
> We should also remove the obsolete comment about early boot. I'm not
> sure the no_pci_devices() check is needed, either. And we can make
> the same simplification in pci_get_class().
Will check the no_pci_devices() part, and try to make it a separate
patch for easy reverting in case of error.
>
> > ------------
> > diff --git a/drivers/pci/search.c b/drivers/pci/search.c
> > index 993d4a0..e5ccede 100644
> > --- a/drivers/pci/search.c
> > +++ b/drivers/pci/search.c
> > @@ -246,7 +246,7 @@ struct pci_dev *pci_get_subsys(unsigned int vendor,
> > unsigned int device,
> > struct pci_dev *from)
> > {
> > + id.vendor = vendor;
> > + id.device = device;
> > + id.subvendor = ss_vendor;
> > + id.subdevice = ss_device;
> >
> > + pdev = pci_get_dev_by_id(&id, from);
>
> No need for "pdev" here, since we don't have to free anything.
ok, will directly return it.
Thanks,
Feng
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