From fc6320b1a675001ac9599bf82aeba59f47deba6d Mon Sep 17 00:00:00 2001
From: Thommy Jakobsson <thommyj@gmail.com>
Date: Tue, 23 Apr 2013 21:45:11 +0200
Subject: [PATCH] B43: Handle DMA RX descriptor underrun

commit 73b82bf0bfbf58e6ff328d3726934370585f6e78 upstream.

Add handling of rx descriptor underflow. This fixes a fault that could
happen on slow machines, where data is received faster than the CPU can
handle. In such a case the device will use up all rx descriptors and
refuse to send any more data before confirming that it is ok. This
patch enables necessary interrupt to discover such a situation and will
handle them by dropping everything in the ring buffer.

Reviewed-by: Michael Buesch <m@bues.ch>
Signed-off-by: Thommy Jakobsson <thommyj@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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