x86/amd-iommu: Don't detach device from pt domain on driver unbind

This patch makes sure a device is not detached from the
passthrough domain when the device driver is unloaded or
does otherwise release the device.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index a8e74c34dd27c917fb1b5f2fdc3b2ed1896c91f7..12a541deae5ebb7def1bf0fb19da149ec1a46b98 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1195,6 +1195,8 @@ static int device_change_notifier(struct notifier_block *nb,
        case BUS_NOTIFY_UNBOUND_DRIVER:
                if (!domain)
                        goto out;
+               if (iommu_pass_through)
+                       break;
                detach_device(domain, devid);
                break;
        case BUS_NOTIFY_ADD_DEVICE: