Commit f671be04 authored May 26, 2010 by FUJITA Tomonori Committed by Linus Torvalds May 27, 2010

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>

parent 5fd75a78

Documentation/DMA-API-HOWTO.txt

+5 −0

Original line number	Original line	Diff line number	Diff line
	@@ -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