iommufd/fault: Destroy response and mutex in iommufd_fault_destroy()

JIRA: https://issues.redhat.com/browse/RHEL-75942

commit 3f4818e
Author: Nicolin Chen <nicolinc@nvidia.com>
Date:   Tue Jan 14 22:55:59 2025 -0800

    iommufd/fault: Destroy response and mutex in iommufd_fault_destroy()

    Both were missing in the initial patch.

    Fixes: 07838f7 ("iommufd: Add iommufd fault object")
    Link: https://patch.msgid.link/r/bc8bb13e215af27e62ee51bdba3648dd4ed2dce3.1736923732.git.nicolinc@nvidia.com
    Cc: stable@vger.kernel.org
    Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
    Reviewed-by: Kevin Tian <kevin.tian@intel.com>
    Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
    Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
    Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Signed-off-by: Eder Zulian <ezulian@redhat.com>

Author: efzrh

drivers/iommu/iommufd/fault.c

@@ -208,6 +208,7 @@ void iommufd_fault_destroy(struct iommufd_object *obj)
 {
 	struct iommufd_fault *fault = container_of(obj, struct iommufd_fault, obj);
 	struct iopf_group *group, *next;
+	unsigned long index;
 
 	/*
 	 * The iommufd object's reference count is zero at this point.
@@ -220,6 +221,13 @@ void iommufd_fault_destroy(struct iommufd_object *obj)
 		iopf_group_response(group, IOMMU_PAGE_RESP_INVALID);
 		iopf_free_group(group);
 	}
+	xa_for_each(&fault->response, index, group) {
+		xa_erase(&fault->response, index);
+		iopf_group_response(group, IOMMU_PAGE_RESP_INVALID);
+		iopf_free_group(group);
+	}
+	xa_destroy(&fault->response);
+	mutex_destroy(&fault->mutex);
 }
 
 static void iommufd_compose_fault_message(struct iommu_fault *fault,