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

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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>
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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 Closing
This document, and the API itself, would not be in its current This document, and the API itself, would not be in its current