wifi: rtw88: add a work to correct atomic scheduling warning of ::set_tim

The set_tim is supposed to be atomic, but we should download beacon
context to firmware with a mutex lock. To avoid warning, do the thing in
another work.

BUG: scheduling while atomic: swapper/1/0/0x00000700
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Tainted: G        W         5.18.0-rc7-00703-g33b5ee09a0c1 #4
Hardware name: Pine64 RK3566 Quartz64-A Board (DT)
Call trace:
 dump_backtrace.part.0+0xc4/0xd0
 show_stack+0x14/0x60
 dump_stack_lvl+0x60/0x78
 dump_stack+0x14/0x2c
 __schedule_bug+0x5c/0x70
 __schedule+0x5c4/0x630
 schedule+0x44/0xb0
 schedule_preempt_disabled+0xc/0x14
 __mutex_lock.constprop.0+0x538/0x56c
 __mutex_lock_slowpath+0x10/0x20
 mutex_lock+0x54/0x60
 rtw_ops_set_tim+0x20/0x40
 __sta_info_recalc_tim+0x150/0x250
 sta_info_recalc_tim+0x10/0x20
 invoke_tx_handlers_early+0x4e4/0x5c0
 ieee80211_tx+0x78/0x110
 ieee80211_xmit+0x94/0xc0
 __ieee80211_subif_start_xmit+0x818/0xd20
 ieee80211_subif_start_xmit+0x44/0x2d0
 dev_hard_start_xmit+0xd0/0x150
 __dev_queue_xmit+0x250/0xb30
 dev_queue_xmit+0x10/0x20
 br_dev_queue_push_xmit+0x94/0x174
 br_forward_finish+0x90/0xa0
 __br_forward+0xc0/0x13c
 br_forward+0x108/0x134
 br_dev_xmit+0x1cc/0x3a4
 dev_hard_start_xmit+0xd0/0x150
 __dev_queue_xmit+0x250/0xb30
 dev_queue_xmit+0x10/0x20
 arp_xmit+0x6c/0x7c
 arp_send_dst+0x8c/0xc0
 arp_solicit+0xd4/0x1e0
 neigh_probe+0x58/0xa0
 neigh_timer_handler+0x27c/0x380
 call_timer_fn.constprop.0+0x20/0x80
 __run_timers.part.0+0x230/0x280
 run_timer_softirq+0x38/0x70
 _stext+0x104/0x278
 __irq_exit_rcu+0xa4/0xdc
 irq_exit_rcu+0xc/0x14
 el1_interrupt+0x34/0x50
 el1h_64_irq_handler+0x14/0x20
 el1h_64_irq+0x64/0x68
 arch_cpu_idle+0x14/0x20
 do_idle+0x208/0x290
 cpu_startup_entry+0x20/0x30
 secondary_start_kernel+0x130/0x144
 __secondary_switched+0x54/0x58

Fixes: f221796 ("rtw88: Add update beacon flow for AP mode")
Reported-by: Ondřej Jirman <megi@xff.cz>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Tested-by: Ondřej Jirman <megi@xff.cz>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220526051251.281905-1-pkshih@realtek.com

Author: Ping-Ke Shih

drivers/net/wireless/realtek/rtw88/fw.c

@@ -1602,6 +1602,16 @@ int rtw_fw_download_rsvd_page(struct rtw_dev *rtwdev)
 	return ret;
 }
 
+void rtw_fw_update_beacon_work(struct work_struct *work)
+{
+	struct rtw_dev *rtwdev = container_of(work, struct rtw_dev,
+					      update_beacon_work);
+
+	mutex_lock(&rtwdev->mutex);
+	rtw_fw_download_rsvd_page(rtwdev);
+	mutex_unlock(&rtwdev->mutex);
+}
+
 static void rtw_fw_read_fifo_page(struct rtw_dev *rtwdev, u32 offset, u32 size,
 				  u32 *buf, u32 residue, u16 start_pg)
 {

drivers/net/wireless/realtek/rtw88/fw.h

@@ -809,6 +809,7 @@ void rtw_add_rsvd_page_pno(struct rtw_dev *rtwdev,
 void rtw_add_rsvd_page_sta(struct rtw_dev *rtwdev,
 			   struct rtw_vif *rtwvif);
 int rtw_fw_download_rsvd_page(struct rtw_dev *rtwdev);
+void rtw_fw_update_beacon_work(struct work_struct *work);
 void rtw_send_rsvd_page_h2c(struct rtw_dev *rtwdev);
 int rtw_dump_drv_rsvd_page(struct rtw_dev *rtwdev,
 			   u32 offset, u32 size, u32 *buf);

drivers/net/wireless/realtek/rtw88/mac80211.c

@@ -493,9 +493,7 @@ static int rtw_ops_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
 {
 	struct rtw_dev *rtwdev = hw->priv;
 
-	mutex_lock(&rtwdev->mutex);
-	rtw_fw_download_rsvd_page(rtwdev);
-	mutex_unlock(&rtwdev->mutex);
+	ieee80211_queue_work(hw, &rtwdev->update_beacon_work);
 
 	return 0;
 }

drivers/net/wireless/realtek/rtw88/main.c

@@ -1442,6 +1442,7 @@ void rtw_core_stop(struct rtw_dev *rtwdev)
 	mutex_unlock(&rtwdev->mutex);
 
 	cancel_work_sync(&rtwdev->c2h_work);
+	cancel_work_sync(&rtwdev->update_beacon_work);
 	cancel_delayed_work_sync(&rtwdev->watch_dog_work);
 	cancel_delayed_work_sync(&coex->bt_relink_work);
 	cancel_delayed_work_sync(&coex->bt_reenable_work);
@@ -1998,6 +1999,7 @@ int rtw_core_init(struct rtw_dev *rtwdev)
 	INIT_WORK(&rtwdev->c2h_work, rtw_c2h_work);
 	INIT_WORK(&rtwdev->ips_work, rtw_ips_work);
 	INIT_WORK(&rtwdev->fw_recovery_work, rtw_fw_recovery_work);
+	INIT_WORK(&rtwdev->update_beacon_work, rtw_fw_update_beacon_work);
 	INIT_WORK(&rtwdev->ba_work, rtw_txq_ba_work);
 	skb_queue_head_init(&rtwdev->c2h_queue);
 	skb_queue_head_init(&rtwdev->coex.queue);

drivers/net/wireless/realtek/rtw88/main.h

@@ -2008,6 +2008,7 @@ struct rtw_dev {
 	struct work_struct c2h_work;
 	struct work_struct ips_work;
 	struct work_struct fw_recovery_work;
+	struct work_struct update_beacon_work;
 
 	/* used to protect txqs list */
 	spinlock_t txq_lock;