Subject: [PATCH] Documentation: add a guideline for hard_start_xmit method not to modify SKB

From: Matti Linnanvuori <[email-masked]>
Date: Sat, 22 Dec 2007 18:22:09 +0100 (CET)

From: Matti Linnanvuori <[email-masked]>

Add a guideline for hard_start_xmit method not to
modify SKB.

Signed-off-by: Matti Linnanvuori
<[email-masked]>

---

--- a/Documentation/networking/driver.txt	2007-12-22
18:50:28.062169500 +0200
+++ b/Documentation/networking/driver.txt	2007-12-22
19:10:58.726566000 +0200

@@ -74,6 +74,9 @@ Transmit path guidelines:
    If you return 1 from the hard_start_xmit method,
you must not keep
    any reference to that SKB and you must not attempt
to free it up.
 
+4) A hard_start_xmit method must not modify the
cloned parts of the
+   SKB.
+
 Probing guidelines:
 
 1) Any hardware layer address you obtain for your
device should

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