From fbf33a2802f71dba06faa948af805884ff16a2ab Mon Sep 17 00:00:00 2001
From: "Kretschmer, Mathias" <mathias.kretschmer@fokus.fraunhofer.de>
Date: Fri, 8 May 2015 15:44:37 +0200
Subject: [PATCH] af_packet / TX_RING not fully non-blocking (w/ MSG_DONTWAIT).

This patch fixes an issue where the send(MSG_DONTWAIT) call
on a TX_RING is not fully non-blocking in cases where the device's sndBuf is
full. We pass nonblock=true to sock_alloc_send_skb() and return any possibly
occuring error code (most likely EGAIN) to the caller. As the fast-path stays
as it is, we keep the unlikely() around skb == NULL.

Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
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