diff options
Diffstat (limited to 'drivers/iommu/amd_iommu.c')
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 6b0760dafb3e..b319e51c379b 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -140,10 +140,14 @@ static struct lock_class_key reserved_rbtree_key; static inline int match_hid_uid(struct device *dev, struct acpihid_map_entry *entry) { + struct acpi_device *adev = ACPI_COMPANION(dev); const char *hid, *uid; - hid = acpi_device_hid(ACPI_COMPANION(dev)); - uid = acpi_device_uid(ACPI_COMPANION(dev)); + if (!adev) + return -ENODEV; + + hid = acpi_device_hid(adev); + uid = acpi_device_uid(adev); if (!hid || !(*hid)) return -ENODEV; |