[PATCH v2 16/17] iommu: Mark dev_iommu_get() with lockdep

Jason Gunthorpe
2023-11-15T14:06:45Z

Allocation of dev->iommu must be done under the
iommu_probe_device_lock. Mark this with lockdep to discourage future
mistakes.

Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
drivers/iommu/iommu.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index de6dcb244bff4a..34c4b07a6aafae 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -345,6 +345,8 @@ static struct dev_iommu *dev_iommu_get(struct device *dev)
{
struct dev_iommu *param = dev->iommu;

+ lockdep_assert_held(&iommu_probe_device_lock);
+
if (param)
return param;