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-rw-r--r--Documentation/networking/driver.txt5
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/networking/driver.txt b/Documentation/networking/driver.txt
index 4f7da5a2bf4..ea72d2e66ca 100644
--- a/Documentation/networking/driver.txt
+++ b/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.