tree 248ff66cad0ef1dbacbea12614274eb3d885636d
parent 5459f0c1254b464113479f72e6a8535007992692
author Felix Fietkau <nbd@openwrt.org> 1376143155 +0200
committer chrmhoffmann <chrmhoffmann@gmail.com> 1586074729 +0200

ath9k: fix rx descriptor related race condition

commit e96542e55a2aacf4bdeccfe2f17b77c4895b4df2 upstream.

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.

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