[1/2] powerpc/pseries: Fix corrupted pdn list

Gavin Shan gwshan at linux.vnet.ibm.com
Fri Aug 28 11:09:05 AEST 2015

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.



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