iommu/amd/iommu_v2: Clear pasid state in free path

Clear pasid state in device amd_iommu_free_device() path. It will make
sure no new ppr notifier is registered in free path.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20230609105146.7773-3-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd/iommu_v2.c

@@ -327,6 +327,9 @@ static void free_pasid_states(struct device_state *dev_state)
 
 		put_pasid_state(pasid_state);
 
+		/* Clear the pasid state so that the pasid can be re-used */
+		clear_pasid_state(dev_state, pasid_state->pasid);
+
 		/*
 		 * This will call the mn_release function and
 		 * unbind the PASID