ath9k: cancel xmit poll work at stop() callback
We forgot to cancel this work at the stop() callback.
------------[ cut here ]------------
WARNING: at net/mac80211/util.c:511 ieee80211_queue_delayed_work+0x3a/0x40 [mac80211]()
Hardware name: 6460DWU
queueing ieee80211 work while going to suspend
Modules linked in: <-- snip -->
Pid: 5124, comm: phy0 Tainted: G W 2.6.31-rc3-wl #4
Call Trace:
[<
ffffffffa03adcda>] ? ieee80211_queue_delayed_work+0x3a/0x40 [mac80211]
[<
ffffffff810552b8>] warn_slowpath_common+0x78/0xd0
[<
ffffffff81055394>] warn_slowpath_fmt+0x64/0x70
[<
ffffffff814ed2c9>] ? thread_return+0x3e/0x635
[<
ffffffffa03adcda>] ieee80211_queue_delayed_work+0x3a/0x40 [mac80211]
[<
ffffffffa0297690>] ath_tx_complete_poll_work+0xc0/0x100 [ath9k]
[<
ffffffffa02975d0>] ? ath_tx_complete_poll_work+0x0/0x100 [ath9k]
[<
ffffffff81069b68>] worker_thread+0x178/0x260
[<
ffffffff8106ecc0>] ? autoremove_wake_function+0x0/0x40
[<
ffffffff810699f0>] ? worker_thread+0x0/0x260
[<
ffffffff8106e89e>] kthread+0x9e/0xb0
[<
ffffffff8101302a>] child_rip+0xa/0x20
[<
ffffffff8106e800>] ? kthread+0x0/0xb0
[<
ffffffff81013020>] ? child_rip+0x0/0x20
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>