diff --git a/[refs] b/[refs]
index 1481e622641b..1a3c05142ea7 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: be63a21c9573fbf88106ff0f030da5974551257b
+refs/heads/master: ce3ba1399d2ba81b3699a82649df0cd8223c6662
diff --git a/trunk/Documentation/networking/driver.txt b/trunk/Documentation/networking/driver.txt
index 4f7da5a2bf4f..ea72d2e66ca8 100644
--- a/trunk/Documentation/networking/driver.txt
+++ b/trunk/Documentation/networking/driver.txt
@@ -61,7 +61,10 @@ Transmit path guidelines:
 2) Do not forget to update netdev->trans_start to jiffies after
    each new tx packet is given to the hardware.
 
-3) Do not forget that once you return 0 from your hard_start_xmit
+3) A hard_start_xmit method must not modify the shared parts of a
+   cloned SKB.
+
+4) Do not forget that once you return 0 from your hard_start_xmit
    method, it is your driver's responsibility to free up the SKB
    and in some finite amount of time.