From 0560edaa40d9b07ecce8dfed5d8952807e24a2a3 Mon Sep 17 00:00:00 2001
From: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
Date: Wed, 3 Jun 2009 09:48:31 +0200
Subject: [PATCH] bug 550: NetDevice::GetChannel method need clarification

---
 src/node/net-device.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/node/net-device.h b/src/node/net-device.h
index dcbd06451..201979528 100644
--- a/src/node/net-device.h
+++ b/src/node/net-device.h
@@ -91,7 +91,9 @@ public:
   /**
    * \return the channel this NetDevice is connected to. The value
    *         returned can be zero if the NetDevice is not yet connected
-   *         to any channel.
+   *         to any channel or if the underlying NetDevice has no
+   *         concept of a channel. i.e., callers _must_ check for zero
+   *         and be ready to handle it.
    */
   virtual Ptr<Channel> GetChannel (void) const = 0;