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Documentation: add networking driver's mapping error handling to DMA-API-HOWTO 

Adds the concrete DMA mapping error handling for Networking drivers on the
transmit path.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
FUJITA Tomonori 2010-05-26 14:44:19 -07:00 committed by Linus Torvalds
parent 5fd75a7850
commit f671be04dc
1 changed files with 5 additions and 0 deletions
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5
Documentation/DMA-API-HOWTO.txt
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@ -740,6 +740,11 @@ failure can be determined by:
*/
}
Networking drivers must call dev_kfree_skb to free the socket buffer
and return NETDEV_TX_OK if the DMA mapping fails on the transmit hook
(ndo_start_xmit). This means that the socket buffer is just dropped in
the failure case.
Closing
This document, and the API itself, would not be in its current