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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2010-05-26 14:44:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-27 09:12:52 -0700
commitf671be04dcda09f8383ae26072c0e75a79090193 (patch)
treeaf2a792dfa28ff1f3b3162543fc519ffedca2366 /Documentation/DMA-API-HOWTO.txt
parent5fd75a7850b5156aa93c9fb6404adb8f563b6e02 (diff)
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.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/DMA-API-HOWTO.txt b/Documentation/DMA-API-HOWTO.txt
index 2e435adfbd6..93d90870791 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