summaryrefslogtreecommitdiff
path: root/drivers/iommu/amd_iommu.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/iommu/amd_iommu.c')
-rw-r--r--drivers/iommu/amd_iommu.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index f82060e778a2..08d2775887f7 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2006,6 +2006,15 @@ static void do_detach(struct iommu_dev_data *dev_data)
{
struct amd_iommu *iommu;
+ /*
+ * First check if the device is still attached. It might already
+ * be detached from its domain because the generic
+ * iommu_detach_group code detached it and we try again here in
+ * our alias handling.
+ */
+ if (!dev_data->domain)
+ return;
+
iommu = amd_iommu_rlookup_table[dev_data->devid];
/* decrease reference counters */