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| author |   FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2010-05-26 14:44:19 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-27 09:12:52 -0700 |
| commit | f671be04dcda09f8383ae26072c0e75a79090193 (patch) | |
| tree | af2a792dfa28ff1f3b3162543fc519ffedca2366 /Documentation/DMA-API-HOWTO.txt | |
| parent | dma-mapping: remove unnecessary sync_single_range_* in dma_map_ops (diff) | |
| download | linux-dev-f671be04dcda09f8383ae26072c0e75a79090193.tar.xz linux-dev-f671be04dcda09f8383ae26072c0e75a79090193.zip | |
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>
Diffstat (limited to 'Documentation/DMA-API-HOWTO.txt')
| -rw-r--r-- | Documentation/DMA-API-HOWTO.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/DMA-API-HOWTO.txt b/Documentation/DMA-API-HOWTO.txt index 2e435adfbd6b..93d90870791c 100644 --- a/Documentation/DMA-API-HOWTO.txt +++ b/Documentation/DMA-API-HOWTO.txt @@ -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 |