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iommu/vt-d: Silence RCU-list debugging warning in dmar_find_atsr()

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dmar_find_atsr() calls list_for_each_entry_rcu() outside of an RCU read
side critical section but with dmar_global_lock held. Silence this
false positive.

 drivers/iommu/intel-iommu.c:4504 RCU-list traversed in non-reader section!!
 1 lock held by swapper/0/1:
 #0: ffffffff9755bee8 (dmar_global_lock){+.+.}, at: intel_iommu_init+0x1a6/0xe19

 Call Trace:
  dump_stack+0xa4/0xfe
  lockdep_rcu_suspicious+0xeb/0xf5
  dmar_find_atsr+0x1ab/0x1c0
  dmar_parse_one_atsr+0x64/0x220
  dmar_walk_remapping_entries+0x130/0x380
  dmar_table_init+0x166/0x243
  intel_iommu_init+0x1ab/0xe19
  pci_iommu_init+0x1a/0x44
  do_one_initcall+0xae/0x4d0
  kernel_init_freeable+0x412/0x4c5
  kernel_init+0x19/0x193

Signed-off-by: Qian Cai <cai@lca.pw>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Qian Cai 2020-03-17 11:03:26 -04:00 committed by Joerg Roedel
parent 52355fb191
commit c6f4ebdeba
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/intel-iommu.c
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@ -4501,7 +4501,8 @@ static struct dmar_atsr_unit *dmar_find_atsr(struct acpi_dmar_atsr *atsr)
struct dmar_atsr_unit *atsru; struct dmar_atsr_unit *atsru;
struct acpi_dmar_atsr *tmp; struct acpi_dmar_atsr *tmp;
list_for_each_entry_rcu(atsru, &dmar_atsr_units, list) { list_for_each_entry_rcu(atsru, &dmar_atsr_units, list,
dmar_rcu_check()) {
tmp = (struct acpi_dmar_atsr *)atsru->hdr; tmp = (struct acpi_dmar_atsr *)atsru->hdr;
if (atsr->segment != tmp->segment) if (atsr->segment != tmp->segment)
continue; continue;