From ec8e4e9d3d83b7a973477c2cb4831511b0eec06e Mon Sep 17 00:00:00 2001 From: Gavin Shan Date: Wed, 12 Nov 2014 13:36:10 +1100 Subject: [PATCH] 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 Signed-off-by: Gavin Shan Signed-off-by: Michael Ellerman --- arch/powerpc/platforms/powernv/pci-ioda.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index 762ca14228ea..d03503515692 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -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; } -- 2.20.1