From: Julien Ducourthial <jducourt@free.fr>
Date: Tue, 8 May 2012 22:00:06 +0000 (+0200)
Subject: r8169: fix unsigned int wraparound with TSO
X-Git-Tag: v3.4-rc7~4^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=477206a018f902895bfcd069dd820bfe94c187b1;p=pandora-kernel.git

r8169: fix unsigned int wraparound with TSO

The r8169 may get stuck or show bad behaviour after activating TSO :
the net_device is not stopped when it has no more TX descriptors.
This problem comes from TX_BUFS_AVAIL which may reach -1 when all
transmit descriptors are in use. The patch simply tries to keep positive
values.

Tested with 8111d(onboard) on a D510MO, and with 8111e(onboard) on a
Zotac 890GXITX.

Signed-off-by: Julien Ducourthial <jducourt@free.fr>
Acked-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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