ath9k: fix rx descriptor related race condition

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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>

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Felix Fietkau 2013-08-10 15:59:15 +02:00 • committed by John W. Linville

parent 706478cba5

commit e96542e55a

2 changed files with 14 additions and 8 deletions

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5

drivers/net/wireless/ath/ath9k/ath9k.h

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17

drivers/net/wireless/ath/ath9k/recv.c

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