Re: [syzbot] Re: [usb?] WARNING: ODEBUG bug in corrupted (3)

[syzbot <syzbot+90f31ac02b7ae5e8b578@syzkaller.appspotmail.com>]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org.

***

Subject: Re: [usb?] WARNING: ODEBUG bug in corrupted (3)
Author: lizhi.xu@windriver.com

rtl delayed work not be canceled before put usb device, it trigger following issue:
ODEBUG: free active (active state 0) object: ffff88811dc037c8 object type: timer_list hint: rtl_ips_nic_off_wq_callback+0x0/0x680

#syz test

diff --git a/drivers/net/wireless/realtek/rtlwifi/base.c b/drivers/net/wireless/realtek/rtlwifi/base.c
index aab4605de9c4..605875d21573 100644
--- a/drivers/net/wireless/realtek/rtlwifi/base.c
+++ b/drivers/net/wireless/realtek/rtlwifi/base.c
@@ -449,6 +449,7 @@ static int _rtl_init_deferred_work(struct ieee80211_hw *hw)
 	if (!wq)
 		return -ENOMEM;
 
+	set_bit(RTL_STATUS_WORK_SETUP, &rtlpriv->status);
 	/* <1> timer */
 	timer_setup(&rtlpriv->works.watchdog_timer,
 		    rtl_watch_dog_timer_callback, 0);
@@ -473,6 +474,9 @@ void rtl_deinit_deferred_work(struct ieee80211_hw *hw, bool ips_wq)
 {
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 
+	if (!test_bit(RTL_STATUS_WORK_SETUP, &rtlpriv->status))
+		return;
+
 	del_timer_sync(&rtlpriv->works.watchdog_timer);
 
 	cancel_delayed_work_sync(&rtlpriv->works.watchdog_wq);
@@ -484,6 +488,7 @@ void rtl_deinit_deferred_work(struct ieee80211_hw *hw, bool ips_wq)
 	cancel_delayed_work_sync(&rtlpriv->works.ps_rfon_wq);
 	cancel_delayed_work_sync(&rtlpriv->works.fwevt_wq);
 	cancel_delayed_work_sync(&rtlpriv->works.c2hcmd_wq);
+	clear_bit(RTL_STATUS_WORK_SETUP, &rtlpriv->status);
 }
 EXPORT_SYMBOL_GPL(rtl_deinit_deferred_work);
 
diff --git a/drivers/net/wireless/realtek/rtlwifi/usb.c b/drivers/net/wireless/realtek/rtlwifi/usb.c
index d37a017b2b81..aaa16bc23e91 100644
--- a/drivers/net/wireless/realtek/rtlwifi/usb.c
+++ b/drivers/net/wireless/realtek/rtlwifi/usb.c
@@ -1064,9 +1064,9 @@ void rtl_usb_disconnect(struct usb_interface *intf)
 		ieee80211_unregister_hw(hw);
 		rtlmac->mac80211_registered = 0;
 	} else {
-		rtl_deinit_deferred_work(hw, false);
 		rtlpriv->intf_ops->adapter_stop(hw);
 	}
+	rtl_deinit_deferred_work(hw, false);
 	/*deinit rfkill */
 	/* rtl_deinit_rfkill(hw); */
 	rtl_usb_deinit(hw);
diff --git a/drivers/net/wireless/realtek/rtlwifi/wifi.h b/drivers/net/wireless/realtek/rtlwifi/wifi.h
index ae6e351bc83c..24d3dcbdf81c 100644
--- a/drivers/net/wireless/realtek/rtlwifi/wifi.h
+++ b/drivers/net/wireless/realtek/rtlwifi/wifi.h
@@ -322,6 +322,7 @@ enum rt_eeprom_type {
 
 enum ttl_status {
 	RTL_STATUS_INTERFACE_START = 0,
+	RTL_STATUS_WORK_SETUP = 1,
 };
 
 enum hardware_type {