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powerpc/pseries: Fix oops with MSIs when missing EEH PEs 

The new EEH code introduced a small regression, if the EEH PEs
are missin (which happens currently in qemu for example), it
will deref a NULL pointer in the MSI code.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Alexey Kardashevskiy 2012-11-23 13:25:39 +11:00 committed by Benjamin Herrenschmidt
parent d6dc24613c
commit bb4618823a
1 changed files with 2 additions and 1 deletions
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3
arch/powerpc/platforms/pseries/msi.c
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@ -220,7 +220,8 @@ static struct device_node *find_pe_dn(struct pci_dev *dev, int *total)
/* Get the top level device in the PE */
edev = of_node_to_eeh_dev(dn);
edev = list_first_entry(&edev->pe->edevs, struct eeh_dev, list);
if (edev->pe)
edev = list_first_entry(&edev->pe->edevs, struct eeh_dev, list);
dn = eeh_dev_to_of_node(edev);
if (!dn)
return NULL;