From: Felix Fietkau <nbd@openwrt.org>
Date: Mon, 24 Feb 2014 21:26:06 +0000 (+0100)
Subject: ath9k: fix invalid descriptor discarding
X-Git-Tag: v3.14-rc6~30^2~20^2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b7b146c9c9a0248cc57da71244f672ebc54bbef1;p=pandora-kernel.git

ath9k: fix invalid descriptor discarding

Only set sc->rx.discard_next to rx_stats->rs_more when actually
discarding the current descriptor.

Also, fix a detection of broken descriptors:
First the code checks if the current descriptor is not done.
Then it checks if the next descriptor is done.
Add a check that afterwards checks the first descriptor again, because
it might have been completed in the mean time.

This fixes a regression introduced in
commit 723e711356b5a8a95728a890e254e8b0d47b55cf
"ath9k: fix handling of broken descriptors"

Cc: stable@vger.kernel.org
Reported-by: Marco André Dinis <marcoandredinis@gmail.com>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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