From: Alexander Duyck <alexander.h.duyck@intel.com>
Date: Sat, 28 Sep 2013 06:00:22 +0000 (+0000)
Subject: i40e: Do not directly increment Tx next_to_use
X-Git-Tag: v3.13-rc1~105^2~194^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fc4ac67bc98f1d54ec0ef8bcddf54892ad78e1f9;p=pandora-kernel.git

i40e: Do not directly increment Tx next_to_use

Avoid directly incrementing next_to_use for multiple reasons.  The main
reason being that if we directly increment it then it can attain a state
where it is equal to the ring count.  Technically this is a state it
should not be able to reach but the way this is written it now can.

This patch pulls the value off into a register and then increments it
and writes back either the value or 0 depending on if the value is equal
to the ring count.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

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