iommu/amd: Do not BUG_ON in __detach_device()

The condition in the BUG_ON is an indicator of a BUG, but no
reason to kill the code path. Turn it into a WARN_ON and
bail out if it is hit.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index f82060e778a2..6070b1504497 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2204,7 +2204,8 @@ static void __detach_device(struct iommu_dev_data *dev_data)
         struct protection_domain *domain;
         unsigned long flags;
 
-        BUG_ON(!dev_data->domain);
+        if (WARN_ON(!dev_data->domain))
+                return;
 
         domain = dev_data->domain;