amd iommu: properly detach from protection domain on ->remove

Some drivers may use the dma api during ->remove which will
cause a protection domain to get reattached to a device.  Delay the
detach until after the driver is completely unbound.

[ joro: added a little merge helper ]

[ Impact: fix too early device<->domain removal ]

Signed-off-by: Chris Wright <chrisw@redhat.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index a97db99dad52..d6898833c363 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -57,6 +57,10 @@ static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
 static struct dma_ops_domain *find_protection_domain(u16 devid);
 
 
+#ifndef BUS_NOTIFY_UNBOUND_DRIVER
+#define BUS_NOTIFY_UNBOUND_DRIVER 0x0005
+#endif
+
 #ifdef CONFIG_AMD_IOMMU_STATS
 
 /*
@@ -1012,7 +1016,7 @@ static int device_change_notifier(struct notifier_block *nb,
                 printk(KERN_INFO "AMD IOMMU: Using protection domain %d for "
                        "device %s\n", dma_domain->domain.id, dev_name(dev));
                 break;
-        case BUS_NOTIFY_UNBIND_DRIVER:
+        case BUS_NOTIFY_UNBOUND_DRIVER:
                 if (!domain)
                         goto out;
                 detach_device(domain, devid);