Re: [PATCH 04/10] iommu: Mark dev_iommu_get() with lockdep

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On Tue, Nov 28, 2023 at 08:48:00PM -0400, Jason Gunthorpe wrote:
Allocation of dev->iommu must be done under the
iommu_probe_device_lock. Mark this with lockdep to discourage future

Reviewed-by: Jerry Snitselaar <jsnitsel@xxxxxxxxxx>
Tested-by: Hector Martin <marcan@xxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
  drivers/iommu/iommu.c | 2 ++
  1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 0d25468d53a68a..4323b6276e977f 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -334,6 +334,8 @@ 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;


Reviewed-by: Moritz Fischer <moritzf@xxxxxxxxxx>


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