AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

mac80211: fix suspend/resume races with unregister hw

Browse Source 
Do not call ->suspend, ->resume methods after we unregister wiphy. Also
delete sta_clanup timer after we finish wiphy unregister to avoid this:

WARNING: at lib/debugobjects.c:262 debug_print_object+0x85/0xa0()
Hardware name: 6369CTO
ODEBUG: free active (active state 0) object type: timer_list hint: sta_info_cleanup+0x0/0x180 [mac80211]
Modules linked in: aes_i586 aes_generic fuse bridge stp llc autofs4 sunrpc cpufreq_ondemand acpi_cpufreq mperf ext2 dm_mod uinput thinkpad_acpi hwmon sg arc4 rt2800usb rt2800lib crc_ccitt rt2x00usb rt2x00lib mac80211 cfg80211 i2c_i801 iTCO_wdt iTCO_vendor_support e1000e ext4 mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom yenta_socket ahci libahci pata_acpi ata_generic ata_piix i915 drm_kms_helper drm i2c_algo_bit video [last unloaded: microcode]
Pid: 5663, comm: pm-hibernate Not tainted 3.1.0-rc1-wl+ #19
Call Trace:
 [<c0454cfd>] warn_slowpath_common+0x6d/0xa0
 [<c05e05e5>] ? debug_print_object+0x85/0xa0
 [<c05e05e5>] ? debug_print_object+0x85/0xa0
 [<c0454dae>] warn_slowpath_fmt+0x2e/0x30
 [<c05e05e5>] debug_print_object+0x85/0xa0
 [<f8a808e0>] ? sta_info_alloc+0x1a0/0x1a0 [mac80211]
 [<c05e0bd2>] debug_check_no_obj_freed+0xe2/0x180
 [<c051175b>] kfree+0x8b/0x150
 [<f8a126ae>] cfg80211_dev_free+0x7e/0x90 [cfg80211]
 [<f8a13afd>] wiphy_dev_release+0xd/0x10 [cfg80211]
 [<c068d959>] device_release+0x19/0x80
 [<c05d06ba>] kobject_release+0x7a/0x1c0
 [<c07646a8>] ? rtnl_unlock+0x8/0x10
 [<f8a13adb>] ? wiphy_resume+0x6b/0x80 [cfg80211]
 [<c05d0640>] ? kobject_del+0x30/0x30
 [<c05d1a6d>] kref_put+0x2d/0x60
 [<c05d056d>] kobject_put+0x1d/0x50
 [<c08015f4>] ? mutex_lock+0x14/0x40
 [<c068d60f>] put_device+0xf/0x20
 [<c069716a>] dpm_resume+0xca/0x160
 [<c04912bd>] hibernation_snapshot+0xcd/0x260
 [<c04903df>] ? freeze_processes+0x3f/0x90
 [<c049151b>] hibernate+0xcb/0x1e0
 [<c048fdc0>] ? pm_async_store+0x40/0x40
 [<c048fe60>] state_store+0xa0/0xb0
 [<c048fdc0>] ? pm_async_store+0x40/0x40
 [<c05d0200>] kobj_attr_store+0x20/0x30
 [<c0575ea4>] sysfs_write_file+0x94/0xf0
 [<c051e26a>] vfs_write+0x9a/0x160
 [<c0575e10>] ? sysfs_open_file+0x200/0x200
 [<c051e3fd>] sys_write+0x3d/0x70
 [<c080959f>] sysenter_do_call+0x12/0x28

Cc: stable@kernel.org
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Stanislaw Gruszka 2011-08-12 14:00:59 +02:00 committed by John W. Linville
parent 4475a0a93f
commit ecb4433550
4 changed files with 15 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/cfg80211.h
View File

@ -1865,6 +1865,9 @@ struct wiphy {
* you need use set_wiphy_dev() (see below) */
struct device dev;
/* protects ->resume, ->suspend sysfs callbacks against unregister hw */
bool registered;
/* dir in debugfs: ieee80211/<wiphyname> */
struct dentry *debugfsdir;

2
net/mac80211/main.c
View File

@ -1012,7 +1012,6 @@ void ieee80211_unregister_hw(struct ieee80211_hw *hw)
cancel_work_sync(&local->reconfig_filter);
ieee80211_clear_tx_pending(local);
sta_info_stop(local);
rate_control_deinitialize(local);
if (skb_queue_len(&local->skb_queue) ||
@ -1024,6 +1023,7 @@ void ieee80211_unregister_hw(struct ieee80211_hw *hw)
destroy_workqueue(local->workqueue);
wiphy_unregister(local->hw.wiphy);
sta_info_stop(local);
ieee80211_wep_free(local);
ieee80211_led_exit(local);
kfree(local->int_scan_req);

7
net/wireless/core.c
View File

@ -616,6 +616,9 @@ int wiphy_register(struct wiphy *wiphy)
if (res)
goto out_rm_dev;
rtnl_lock();
rdev->wiphy.registered = true;
rtnl_unlock();
return 0;
out_rm_dev:
@ -647,6 +650,10 @@ void wiphy_unregister(struct wiphy *wiphy)
{
struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
rtnl_lock();
rdev->wiphy.registered = false;
rtnl_unlock();
rfkill_unregister(rdev->rfkill);
/* protect the device list */

6
net/wireless/sysfs.c
View File

@ -93,7 +93,8 @@ static int wiphy_suspend(struct device *dev, pm_message_t state)
if (rdev->ops->suspend) {
rtnl_lock();
ret = rdev->ops->suspend(&rdev->wiphy, rdev->wowlan);
if (rdev->wiphy.registered)
ret = rdev->ops->suspend(&rdev->wiphy, rdev->wowlan);
rtnl_unlock();
}
@ -112,7 +113,8 @@ static int wiphy_resume(struct device *dev)
if (rdev->ops->resume) {
rtnl_lock();
ret = rdev->ops->resume(&rdev->wiphy);
if (rdev->wiphy.registered)
ret = rdev->ops->resume(&rdev->wiphy);
rtnl_unlock();
}