[PATCH kernel] powerpc/powernv: Check kzalloc() return in pnv_pci_table_alloc

[Alexey Kardashevskiy]

pnv_pci_table_alloc() ignores posible failure from kzalloc_node(),
this adds a check. There are 2 callers of pnv_pci_table_alloc(),
one already checks for tbl!=NULL, this adds BUG_ON() to the other path
which only happens during boot time in IODA1 and not expected to fail.

Fixes: 0eaf4defc7c4 ("powerpc/spapr: vfio: Switch from iommu_table to new iommu_table_group")
Signed-off-by: Alexey Kardashevskiy <aik at ozlabs.ru>
---
 arch/powerpc/platforms/powernv/pci-ioda.c | 1 +
 arch/powerpc/platforms/powernv/pci.c      | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index e36738291c32..dcda3f6b7d36 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -2128,6 +2128,7 @@ static void pnv_pci_ioda1_setup_dma_pe(struct pnv_phb *phb,
 
 found:
 	tbl = pnv_pci_table_alloc(phb->hose->node);
+	BUG_ON(!tbl);
 	iommu_register_group(&pe->table_group, phb->hose->global_number,
 			pe->pe_number);
 	pnv_pci_link_table_and_group(phb->hose->node, 0, tbl, &pe->table_group);
diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index eb835e977e33..9acdf6889c0d 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -766,6 +766,9 @@ struct iommu_table *pnv_pci_table_alloc(int nid)
 	struct iommu_table *tbl;
 
 	tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL, nid);
+	if (!tbl)
+		return NULL;
+
 	INIT_LIST_HEAD_RCU(&tbl->it_group_list);
 
 	return tbl;
-- 
2.11.0