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

[Moritz Fischer]

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
> mistakes.

> Reviewed-by: Jerry Snitselaar <jsnitsel at redhat.com>
> Tested-by: Hector Martin <marcan at marcan.st>
> Signed-off-by: Jason Gunthorpe <jgg at 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 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;

> --
> 2.42.0


Reviewed-by: Moritz Fischer <moritzf at google.com>

Cheers,
Moritz