From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 7 Apr 2013 22:04:13 +0000 (+0200)
Subject: ath9k: implement buffer holding handling for EDMA FIFO
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~65^2~43^2^2~84
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=99ba6a4610c8413c9166e600b1797f0a8f1c4498;p=pandora-kernel.git

ath9k: implement buffer holding handling for EDMA FIFO

Inside one FIFO slot queue, EDMA chipsets have the same link pointer
re-read race condition as older chipsets, so the same buffer holding
logic needs to be used in order to avoid use-after-free bugs.
Unlike on older chips, it can be skipped for the end of the queue.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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