]> git.baikalelectronics.ru Git - kernel.git/commit
ath9k: Fix kernel panic during driver initilization
authorMohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Thu, 2 Feb 2012 10:59:05 +0000 (16:29 +0530)
committerJohn W. Linville <linville@tuxdriver.com>
Fri, 3 Feb 2012 19:18:02 +0000 (14:18 -0500)
commit9599acaa0fd15d85e6eddbed3717884a545e76e5
treea123651853cb0b901b4e505d9cf4470883bd7f50
parentd2c87f2277dd932ef3add7eecf02aabfb89e2831
ath9k: Fix kernel panic during driver initilization

all works need to be initialized before ieee80211_register_hw
to prevent mac80211 call backs such as drv_start, drv_config
getting started. otherwise we would queue/cancel works before
initializing them and it leads to kernel panic.
this issue can be recreated with the following script
in Chrome laptops with AR928X cards, with background scan
running (or) Network manager is running

while true
do
sudo modprobe -v ath9k
sleep 3
sudo modprobe -r ath9k
sleep 3
done

 EIP: [<81040a47>] __cancel_work_timer+0xb8/0xe1 SS:ESP 0068:f6be9d70
 ---[ end trace 4f86d6139a9900ef ]---
 Registered led device: ath9k-phy0
 ieee80211 phy0: Atheros AR9280 Rev:2 mem=0xf88a0000,
 irq=16
 Kernel panic - not syncing: Fatal exception
 Pid: 456, comm: wpa_supplicant Tainted: G      D
 3.0.13 #1
Call Trace:
 [<81379e21>] panic+0x53/0x14a
 [<81004a30>] oops_end+0x73/0x81
 [<81004b53>] die+0x4c/0x55
 [<81002710>] do_trap+0x7c/0x83
 [<81002855>] ? do_bounds+0x58/0x58
 [<810028cc>] do_invalid_op+0x77/0x81
 [<81040a47>] ? __cancel_work_timer+0xb8/0xe1
 [<810489ec>] ? sched_clock_cpu+0x81/0x11f
 [<8103f809>] ? wait_on_work+0xe2/0xf7
 [<8137f807>] error_code+0x67/0x6c
 [<810300d8>] ? wait_consider_task+0x4ba/0x84c
 [<81040a47>] ? __cancel_work_timer+0xb8/0xe1
 [<810380c9>] ? try_to_del_timer_sync+0x5f/0x67
 [<81040a91>] cancel_work_sync+0xf/0x11
 [<f88d7b7c>] ath_set_channel+0x62/0x25c [ath9k]
 [<f88d67d1>] ? ath9k_tx_last_beacon+0x26a/0x85c [ath9k]
 [<f88d8899>] ath_radio_disable+0x3f1/0x68e [ath9k]
 [<f90d0edb>] ieee80211_hw_config+0x111/0x116 [mac80211]
 [<f90dd95c>] __ieee80211_recalc_idle+0x919/0xa37 [mac80211]
 [<f90dda76>] __ieee80211_recalc_idle+0xa33/0xa37 [mac80211]
 [<812dbed8>] __dev_open+0x82/0xab

Cc: <stable@vger.kernel.org>
Cc: Gary Morain <gmorain@google.com>
Cc: Paul Stewart <pstew@google.com>
Cc: Vasanthakumar Thiagarajan <vthiagar@qca.qualcomm.com>
Tested-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
drivers/net/wireless/ath/ath9k/init.c