From: Joerg Roedel <joerg.roedel@amd.com>
Date: Tue, 1 Sep 2009 10:22:22 +0000 (+0200)
Subject: x86/amd-iommu: Don't detach device from pt domain on driver unbind
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=a1ca331c8aa75cd58fdf685e2e8745e1d3ec5c8f;p=deliverable%2Flinux.git

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 a8e74c34dd27..12a541deae5e 100644
--- 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: