[PATCH] powerpc/iommu: Don't detach device without IOMMU group

[Gavin Shan]

Some devices, for example PCI root port, don't have IOMMU table and
group. We needn't detach them from their IOMMU group. Otherwise, it
potentially incurs kernel crash because of referring NULL IOMMU group
as following backtrace indicates:

  .iommu_group_remove_device+0x74/0x1b0
  .iommu_bus_notifier+0x94/0xb4
  .notifier_call_chain+0x78/0xe8
  .__blocking_notifier_call_chain+0x7c/0xbc
  .blocking_notifier_call_chain+0x38/0x48
  .device_del+0x50/0x234
  .pci_remove_bus_device+0x88/0x138
  .pci_stop_and_remove_bus_device+0x2c/0x40
  .pcibios_remove_pci_devices+0xcc/0xfc
  .pcibios_remove_pci_devices+0x3c/0xfc

Signed-off-by: Gavin Shan <shangw at linux.vnet.ibm.com>
---
 arch/powerpc/kernel/iommu.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 572bb5b..8a49424 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -1137,6 +1137,17 @@ static int iommu_add_device(struct device *dev)
 
 static void iommu_del_device(struct device *dev)
 {
+	/*
+	 * Some devices might not have IOMMU table and group
+	 * and we needn't detach them from the associated
+	 * IOMMU groups
+	 */
+	if (!dev->iommu_group) {
+		pr_debug("iommu_tce: skipping device %s with no tbl\n",
+			 dev_name(dev));
+		return;
+	}
+
 	iommu_group_remove_device(dev);
 }
 
-- 
1.7.10.4