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authorJoerg Roedel <jroedel@suse.de>2014-08-05 12:55:45 +0200
committerJoerg Roedel <jroedel@suse.de>2014-08-18 13:37:56 +0200
commite7f9fa5498d91fcdc63d93007ba43f36b1a30538 (patch)
tree6dbc2a2cb2e5f4406e594d6782ce53347e3e60e1 /drivers/iommu
parent7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9 (diff)
iommu/vt-d: Defer domain removal if device is assigned to a driver
When the BUS_NOTIFY_DEL_DEVICE event is received the device might still be attached to a driver. In this case the domain can't be released as the mappings might still be in use. Defer the domain removal in this case until we receivce the BUS_NOTIFY_UNBOUND_DRIVER event. Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: stable@vger.kernel.org # v3.15, v3.16 Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel-iommu.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index d1f5caad04f9..5619f264862d 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3869,6 +3869,14 @@ static int device_notifier(struct notifier_block *nb,
action != BUS_NOTIFY_DEL_DEVICE)
return 0;
+ /*
+ * If the device is still attached to a device driver we can't
+ * tear down the domain yet as DMA mappings may still be in use.
+ * Wait for the BUS_NOTIFY_UNBOUND_DRIVER event to do that.
+ */
+ if (action == BUS_NOTIFY_DEL_DEVICE && dev->driver != NULL)
+ return 0;
+
domain = find_domain(dev);
if (!domain)
return 0;