Add a check to the init-path of the AMD IOMMUv2 driver if the hardware is available in the system. Only allocate all the resources if it is really available.
Signed-off-by: Joerg Roedel <[email protected]> --- drivers/iommu/amd_iommu_v2.c | 14 +++++++++++++- 1 files changed, 13 insertions(+), 1 deletions(-) diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c index 8add9f1..036fe9b 100644 --- a/drivers/iommu/amd_iommu_v2.c +++ b/drivers/iommu/amd_iommu_v2.c @@ -921,7 +921,16 @@ static int __init amd_iommu_v2_init(void) size_t state_table_size; int ret; - pr_info("AMD IOMMUv2 driver by Joerg Roedel <[email protected]>"); + pr_info("AMD IOMMUv2 driver by Joerg Roedel <[email protected]>\n"); + + if (!amd_iommu_v2_supported()) { + pr_info("AMD IOMMUv2 functionality not available on this sytem\n"); + /* + * Load anyway to provide the symbols to other modules + * which may use AMD IOMMUv2 optionally. + */ + return 0; + } spin_lock_init(&state_lock); @@ -961,6 +970,9 @@ static void __exit amd_iommu_v2_exit(void) size_t state_table_size; int i; + if (!amd_iommu_v2_supported()) + return; + profile_event_unregister(PROFILE_TASK_EXIT, &profile_nb); amd_iommu_unregister_ppr_notifier(&ppr_nb); -- 1.7.5.4 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
