From: Amir Vadai <amirv@mellanox.com>
Date: Mon, 7 Oct 2013 11:38:13 +0000 (+0200)
Subject: net/mlx4_en: Fix pages never dma unmapped on rx
X-Git-Tag: v3.12-rc7~20^2~56^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=021f1107ffdae7a82af6c53f4c52654062e365c6;p=pandora-kernel.git

net/mlx4_en: Fix pages never dma unmapped on rx

This patch fixes a bug introduced by commit 51151a16 (mlx4: allow
order-0 memory allocations in RX path).

dma_unmap_page never reached because condition to detect last fragment
in page is wrong. offset+frag_stride can't be greater than size, need to
make sure no additional frag will fit in page => compare offset +
frag_stride + next_frag_size instead.
next_frag_size is the same as the current one, since page is shared only
with frags of the same size.

CC: Eric Dumazet <edumazet@google.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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