[PATCH v2] ath9k_htc: Add a missing spin_lock_init()

From: Rajat Asthana <rajatasthana4@gmail.com>
To: ath9k-devel@qca.qualcomm.com, kvalo@codeaurora.org,
	davem@davemloft.net, kuba@kernel.org,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: Rajat Asthana <rajatasthana4@gmail.com>
Subject: [PATCH v2] ath9k_htc: Add a missing spin_lock_init()
Date: Thu, 29 Jul 2021 00:55:33 +0530	[thread overview]
Message-ID: <20210728192533.18727-1-rajatasthana4@gmail.com> (raw)
In-Reply-To: <738fa8cc-c9c4-66c1-e2ee-fe02caa7ef63@gmail.com>

Syzkaller reported a lockdep warning on non-initialized spinlock:

INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 0 PID: 10 Comm: ksoftirqd/0 Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x143/0x1db lib/dump_stack.c:120
 assign_lock_key kernel/locking/lockdep.c:937 [inline]
 register_lock_class+0x1077/0x1180 kernel/locking/lockdep.c:1249
 __lock_acquire+0x102/0x5230 kernel/locking/lockdep.c:4781
 lock_acquire kernel/locking/lockdep.c:5512 [inline]
 lock_acquire+0x19d/0x700 kernel/locking/lockdep.c:5477
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
 _raw_spin_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 ath9k_wmi_event_tasklet+0x231/0x3f0 drivers/net/wireless/ath/ath9k/wmi.c:172
 tasklet_action_common.constprop.0+0x201/0x2e0 kernel/softirq.c:784
 __do_softirq+0x1b0/0x944 kernel/softirq.c:559
 run_ksoftirqd kernel/softirq.c:921 [inline]
 run_ksoftirqd+0x21/0x50 kernel/softirq.c:913
 smpboot_thread_fn+0x3ec/0x870 kernel/smpboot.c:165
 kthread+0x38c/0x460 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

We missed a spin_lock_init() in ath9k_wmi_event_tasklet() when the wmi
event is WMI_TXSTATUS_EVENTID. So, add a spin_lock_init() in
ath9k_init_wmi().

Signed-off-by: Rajat Asthana <rajatasthana4@gmail.com>
---
 drivers/net/wireless/ath/ath9k/wmi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/ath/ath9k/wmi.c b/drivers/net/wireless/ath/ath9k/wmi.c
index fe29ad4b9023..480de2170816 100644
--- a/drivers/net/wireless/ath/ath9k/wmi.c
+++ b/drivers/net/wireless/ath/ath9k/wmi.c
@@ -101,6 +101,7 @@ struct wmi *ath9k_init_wmi(struct ath9k_htc_priv *priv)
 	skb_queue_head_init(&wmi->wmi_event_queue);
 	spin_lock_init(&wmi->wmi_lock);
 	spin_lock_init(&wmi->event_lock);
+	spin_lock_init(&wmi->drv_priv->tx.tx_lock);
 	mutex_init(&wmi->op_mutex);
 	mutex_init(&wmi->multi_write_mutex);
 	mutex_init(&wmi->multi_rmw_mutex);
-- 
2.32.0

