iommufd: Assert devices_lock for iommufd_hw_pagetable_has_group()

The hwpt->devices list is locked by this, make it clearer.

Link: https://lore.kernel.org/r/1-v3-ae9c2975a131+2e1e8-iommufd_hwpt_jgg@nvidia.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index a0c66f4..dcfaf65 100644 (file)
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -186,6 +186,8 @@ static bool iommufd_hw_pagetable_has_group(struct iommufd_hw_pagetable *hwpt,
 {
        struct iommufd_device *cur_dev;
 
+       lockdep_assert_held(&hwpt->devices_lock);
+
        list_for_each_entry(cur_dev, &hwpt->devices, devices_item)
                if (cur_dev->group == group)
                        return true;