[PATCH V2] powerpc/eeh: Fix kernel crash when passing through VF

[Gavin Shan]

On Fri, Sep 12, 2014 at 01:55:23PM +1000, Michael Ellerman wrote:
>On Thu, 2014-09-11 at 11:42 +0800, Wei Yang wrote:
>> diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c
>> index 4a45ba8..403445e 100644
>> --- a/arch/powerpc/kernel/eeh.c
>> +++ b/arch/powerpc/kernel/eeh.c
>> @@ -625,7 +625,7 @@ int eeh_pci_enable(struct eeh_pe *pe, int function)
>>  int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state)
>>  {
>>  	struct eeh_dev *edev = pci_dev_to_eeh_dev(dev);
>> -	struct eeh_pe *pe = edev->pe;
>> +	struct eeh_pe *pe = edev ? edev->pe : NULL;
>>  
>>  	if (!pe) {
>>  		pr_err("%s: No PE found on PCI device %s\n",
>
>
>We seem to do this or something similar in a few places. Is it worth having a
>pci_dev_to_eeh_pe() inline?
>

Yes, maybe we just need a eeh_dev_to_pe() because converting
pci_dev to eeh_dev is already coverred by pci_dev_to_eeh_dev().

With eeh_dev_to_pe(), it looks like this:

struct pci_dev *pdev;
struct eeh_dev *edev = pci_dev_to_eeh_dev(pdev);
struct eeh_pe *pe = eeh_dev_to_pe(edev);

Or another case:

struct device_node *dn;
struct eeh_dev *edev = of_node_to_eeh_dev(dn);
struct eeh_pe *pe = eeh_dev_to_pe(edev);

Thanks,
Gavin

>cheers
>
>