netdev - [PATCH v2] Documentation: add a guideline for hard_start

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Date:	Sat, 12 Jan 2008 21:33:26 -0800 (PST)
From:	Matti Linnanvuori <mattilinnanvuori@...oo.com>
To:	jgarzik@...ox.com, netdev@...r.kernel.org
Subject: [PATCH v2] Documentation: add a guideline for hard_start_xmit method

From: Matti Linnanvuori <mattilinnanvuori@...oo.com>
 
Add a guideline for hard_start_xmit method not to
modify SKB.
 
Signed-off-by: Matti Linnanvuori <mattilinnanvuori@...oo.com>
---
--- a/Documentation/networking/driver.txt 2008-01-13 07:14:01.608291500 +0200
+++ b/Documentation/networking/driver.txt 2008-01-13 07:13:40.535421500 +0200
@@ -61,7 +61,9 @@
 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 the 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.


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