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authorStanislaw Gruszka <sgruszka@redhat.com>2011-08-12 14:00:59 +0200
committerJohn W. Linville <linville@tuxdriver.com>2011-08-22 14:21:40 -0400
commitecb4433550f0620f3d1471ae7099037ede30a91e (patch)
treed650895f78a024c45b5113cf923d7311caa74712 /net
parent4475a0a93f368e57d5306d4cbe9318e8c1c90c41 (diff)
downloadlinux-linaro-stable-ecb4433550f0620f3d1471ae7099037ede30a91e.tar.gz
mac80211: fix suspend/resume races with unregister hw
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>
Diffstat (limited to 'net')
-rw-r--r--net/mac80211/main.c2
-rw-r--r--net/wireless/core.c7
-rw-r--r--net/wireless/sysfs.c6
3 files changed, 12 insertions, 3 deletions
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 866f269183cf..acb44230b251 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -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);
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 645437cfc464..c14865172da7 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -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 */
diff --git a/net/wireless/sysfs.c b/net/wireless/sysfs.c
index c6e4ca6a7d2e..ff574597a854 100644
--- a/net/wireless/sysfs.c
+++ b/net/wireless/sysfs.c
@@ -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();
}