[1/2] powerpc/pseries: Fix corrupted pdn list
mpe at ellerman.id.au
Fri Aug 28 11:32:40 AEST 2015
On Fri, 2015-08-28 at 11:09 +1000, Gavin Shan wrote:
> On Fri, Aug 28, 2015 at 10:55:35AM +1000, Michael Ellerman wrote:
> >On Thu, 2015-27-08 at 04:12:36 UTC, Gavin Shan wrote:
> >> Commit cca87d30 ("powerpc/pci: Refactor pci_dn") introduced pdn
> >> list for SRIOV VFs. It means the pdn is be put into the child list
> >> of its parent pdn when the pdn is created. When doing PCI hot
> >> unplugging on pSeries, the PCI device node as well as its pdn are
> >> released through procfs entry "powerpc/ofdt". Some one else grabs
> >> the memory chunk of the pdn and update it accordingly. At the same
> >> time, the pdn is still tracked in the child list of parent pdn. It
> >> leads to corrupted child list in the parent pdn.
> >> This fixes above issue by removing the pdn from the child list of
> >> its parent pdn when the device node is detached from the system.
> >> Note the pdn is free'd when the device node is released if the
> >> device node is dynamic one. Otherwise, the device node as well
> >> as the pdn won't be released.
> >> Fixes: cca87d30 ("powerpc/pci: Refactor pci_dn")
> >That went into 4.1, so this should presumably go to stable?
> Yeah, This should be put into 4.1 stable.
Cc: stable at vger.kernel.org # 4.1
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