tree 63a0a100c2c19a1e56c37c775c2a2a4648cc0b38
parent 706478cba544584a1f8d515646f8d677d096395e
author Felix Fietkau <nbd@openwrt.org> 1376143155 +0200
committer John W. Linville <linville@tuxdriver.com> 1376597276 -0400

ath9k: fix rx descriptor related race condition

Similar to a race condition that exists in the tx path, the hardware
might re-read the 'next' pointer of a descriptor of the last completed
frame. This only affects non-EDMA (pre-AR93xx) devices.

To deal with this race, defer clearing and re-linking a completed rx
descriptor until the next one has been processed.

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