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powerpc/powernv: Bail upon invalid master PE 

When freezing compound PEs in pnv_ioda_freeze_pe(), we should bail
upon illegal master PE. We needn't freeze slave PE because it should
have been put into frozen state by hardware.

Reported-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Gavin Shan 2014-11-12 13:36:10 +11:00 committed by Michael Ellerman
parent 4773f76b61
commit ec8e4e9d3d
1 changed files with 3 additions and 1 deletions
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4
arch/powerpc/platforms/powernv/pci-ioda.c
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@ -373,7 +373,9 @@ static void pnv_ioda_freeze_pe(struct pnv_phb *phb, int pe_no)
/* Fetch master PE */
if (pe->flags & PNV_IODA_PE_SLAVE) {
pe = pe->master;
WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER));
if (WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER)))
return;
pe_no = pe->pe_number;
}