misc: vmw_vmci: Switch to kvfree_rcu() API

Instead of invoking a synchronize_rcu() to free a pointer
after a grace period we can directly make use of new API
that does the same but in more efficient way.
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Link: https://lore.kernel.org/r/20211215111845.2514-6-urezki@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/vmw_vmci/vmci_context.c

@@ -687,10 +687,8 @@ int vmci_ctx_remove_notification(u32 context_id, u32 remote_cid)
 	}
 	spin_unlock(&context->lock);
 
-	if (found) {
-		synchronize_rcu();
-		kfree(notifier);
-	}
+	if (found)
+		kvfree_rcu(notifier);
 
 	vmci_ctx_put(context);
 

drivers/misc/vmw_vmci/vmci_event.c

@@ -209,8 +209,7 @@ int vmci_event_unsubscribe(u32 sub_id)
 	if (!s)
 		return VMCI_ERROR_NOT_FOUND;
 
-	synchronize_rcu();
-	kfree(s);
+	kvfree_rcu(s);
 
 	return VMCI_SUCCESS;
 }