diff options
| -rw-r--r-- | drivers/iommu/intel/dmar.c | 1 | ||||
| -rw-r--r-- | drivers/iommu/intel/iommu.c | 7 |
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c index eaf862e8dea1..7f553f7aa3cb 100644 --- a/drivers/iommu/intel/dmar.c +++ b/drivers/iommu/intel/dmar.c @@ -2056,6 +2056,7 @@ int enable_drhd_fault_handling(unsigned int cpu) /* * Enable fault control interrupt. */ + guard(rwsem_read)(&dmar_global_lock); for_each_iommu(iommu, drhd) { u32 fault_status; int ret; diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 136a6aeec916..9c46a4cd3848 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -3307,7 +3307,14 @@ int __init intel_iommu_init(void) iommu_device_sysfs_add(&iommu->iommu, NULL, intel_iommu_groups, "%s", iommu->name); + /* + * The iommu device probe is protected by the iommu_probe_device_lock. + * Release the dmar_global_lock before entering the device probe path + * to avoid unnecessary lock order splat. + */ + up_read(&dmar_global_lock); iommu_device_register(&iommu->iommu, &intel_iommu_ops, NULL); + down_read(&dmar_global_lock); iommu_pmu_register(iommu); } |