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Commit f671be04 authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Linus Torvalds
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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: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 5fd75a78

Documentation/DMA-API-HOWTO.txt

+5 −0
Original line number 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



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