AMD IOMMU: don't BUG() when we don't have to

find_iommu_for_device() can easily return NULL instead, as all of its
callers are prepared for that.

Signed-off-by: Jan Beulich <jbeulich@suse.com>

diff --git a/xen/drivers/passthrough/amd/pci_amd_iommu.c b/xen/drivers/passthrough/amd/pci_amd_iommu.c
index edf1b9f1f30e9dd33ed7b0fd2d8bab83f23be8b8..0f8cfeb56c533d4e51114c2b092a9888b1885195 100644 (file)
--- a/xen/drivers/passthrough/amd/pci_amd_iommu.c
+++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c
@@ -32,8 +32,8 @@ struct amd_iommu *find_iommu_for_device(int seg, int bdf)
 {
     struct ivrs_mappings *ivrs_mappings = get_ivrs_mappings(seg);
 
-    BUG_ON ( bdf >= ivrs_bdf_entries );
-    return ivrs_mappings ? ivrs_mappings[bdf].iommu : NULL;
+    return ivrs_mappings && bdf < ivrs_bdf_entries ? ivrs_mappings[bdf].iommu
+                                                   : NULL;
 }
 
 /*