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| author | Sai Praneeth Prakhya <[email protected]> | 2020-11-24 21:06:03 +0800 |
|---|---|---|
| committer | Will Deacon <[email protected]> | 2020-11-25 12:14:33 +0000 |
| commit | 0b8a96a3120ffe4d3571d93902693c59f90c3d0c (patch) | |
| tree | 8d7845d5f7b08be39b68df3023ef435c3ef16707 /tools/testing/selftests/bpf/prog_tests | |
| parent | 08a27c1c3ecf5e1da193ce5f8fc97c3be16e75f0 (diff) | |
iommu: Take lock before reading iommu group default domain type
"/sys/kernel/iommu_groups/<grp_id>/type" file could be read to find out the
default domain type of an iommu group. The default domain of an iommu group
doesn't change after booting and hence could be read directly. But,
after addding support to dynamically change iommu group default domain, the
above assumption no longer stays valid.
iommu group default domain type could be changed at any time by writing to
"/sys/kernel/iommu_groups/<grp_id>/type". So, take group mutex before
reading iommu group default domain type so that the user wouldn't see stale
values or iommu_group_show_type() doesn't try to derefernce stale pointers.
Signed-off-by: Sai Praneeth Prakhya <[email protected]>
Signed-off-by: Lu Baolu <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: Ashok Raj <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Sohil Mehta <[email protected]>
Cc: Robin Murphy <[email protected]>
Cc: Jacob Pan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests')
0 files changed, 0 insertions, 0 deletions