diff options
| author | Joerg Roedel <jroedel@suse.de> | 2017-10-06 15:00:53 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2017-10-06 15:09:30 +0200 |
| commit | ec154bf56b276a0bb36079a5d22a267b5f417801 (patch) | |
| tree | 42d05fab0d9473435a887dba7589f1659863af9c /drivers | |
| parent | 9e66317d3c92ddaab330c125dfe9d06eee268aff (diff) | |
iommu/vt-d: Don't register bus-notifier under dmar_global_lock
The notifier function will take the dmar_global_lock too, so
lockdep complains about inverse locking order when the
notifier is registered under the dmar_global_lock.
Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
Fixes: 59ce0515cdaf ('iommu/vt-d: Update DRHD/RMRR/ATSR device scope caches when PCI hotplug happens')
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/dmar.c | 7 | ||||
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 10 |
2 files changed, 15 insertions, 2 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index 57c920c1372d..1ea7cd537873 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -801,13 +801,16 @@ int __init dmar_dev_scope_init(void) dmar_free_pci_notify_info(info); } } - - bus_register_notifier(&pci_bus_type, &dmar_pci_bus_nb); } return dmar_dev_scope_status; } +void dmar_register_bus_notifier(void) +{ + bus_register_notifier(&pci_bus_type, &dmar_pci_bus_nb); +} + int __init dmar_table_init(void) { diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 6784a05dd6b2..934cef924461 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -4752,6 +4752,16 @@ int __init intel_iommu_init(void) goto out_free_dmar; } + up_write(&dmar_global_lock); + + /* + * The bus notifier takes the dmar_global_lock, so lockdep will + * complain later when we register it under the lock. + */ + dmar_register_bus_notifier(); + + down_write(&dmar_global_lock); + if (no_iommu || dmar_disabled) { /* * We exit the function here to ensure IOMMU's remapping and |