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Date:   Thu, 31 Aug 2017 16:47:43 +0200
From:   Pavel Machek <>
To:     Kalle Valo <>,
        Linus Torvalds <>
Cc:     David Miller <>,,,,,,
Subject: [PATCH] wl1251: add a missing spin_lock_init()

From: Cong Wang <>

wl1251: add a missing spin_lock_init()
This fixes the following kernel warning:
 [ 5668.771453] BUG: spinlock bad magic on CPU#0, kworker/u2:3/9745
 [ 5668.771850]  lock: 0xce63ef20, .magic: 00000000, .owner: <none>/-1,
 .owner_cpu: 0
 [ 5668.772277] CPU: 0 PID: 9745 Comm: kworker/u2:3 Tainted: G        W
 4.12.0-03002-gec979a4-dirty #40
 [ 5668.772796] Hardware name: Nokia RX-51 board
 [ 5668.773071] Workqueue: phy1 wl1251_irq_work
 [ 5668.773345] [<c010c9e4>] (unwind_backtrace) from [<c010a274>]
 [ 5668.773803] [<c010a274>] (show_stack) from [<c01545a4>]
 [ 5668.774230] [<c01545a4>] (do_raw_spin_lock) from [<c06ca578>]
 [ 5668.774658] [<c06ca578>] (_raw_spin_lock_irqsave) from [<c048c010>]
 [ 5668.775115] [<c048c010>] (wl1251_op_tx) from [<c06a12e8>]
 [ 5668.775543] [<c06a12e8>] (ieee80211_tx_frags) from [<c06a138c>]
 [ 5668.775970] [<c06a138c>] (__ieee80211_tx) from [<c06a3dbc>]
 [ 5668.776367] [<c06a3dbc>] (ieee80211_tx) from [<c06a4af0>]
 [ 5668.776824] [<c06a4af0>] (__ieee80211_subif_start_xmit) from
 [<c06a4f94>] (ieee80211_subif_start_xmit+0x30/0x2fc)
 [ 5668.777343] [<c06a4f94>] (ieee80211_subif_start_xmit) from
 [<c0578848>] (dev_hard_start_xmit+0x80/0x118)
    by adding the missing spin_lock_init().
Reported-by: Pavel Machek <>
Cc: Kalle Valo <>
Signed-off-by: Cong Wang <>
Acked-by: Pavel Machek <>
Signed-off-by: Kalle Valo <>
Signed-off-by: Pavel Machek <>


> >> Yeah, you are right there. I did actually ponder which I tree should
> >> commit it back in July but due to various reasons decided differently.
> >
> > Can we still get the fix to v4.13-final? :-).
> I'm not planning to submit pull requests to 4.13 anymore. If you think
> this is so important that it needs to be applied in the last minute (I
> don't) you could always try to convince Dave to take it directly.
> Or better yet, push it to the stable tree. If the merge window opens on
> Sunday I suspect that the commit will be in Linus' tree sometime next
> week. Then you can submit the request to the stable team to take it.

I don't think we should use stable tree as an excuse for not fixing
the bugs in mainline. Original patch is from Jul 6, thats 7 weeks ago.

Dave, Linus -- can you still take the patch?


diff --git a/drivers/net/wireless/ti/wl1251/main.c b/drivers/net/wireless/ti/wl1251/main.c
index 08f0477..9915d83 100644
--- a/drivers/net/wireless/ti/wl1251/main.c
+++ b/drivers/net/wireless/ti/wl1251/main.c
@@ -1571,6 +1571,7 @@ struct ieee80211_hw *wl1251_alloc_hw(void)
 	wl->state = WL1251_STATE_OFF;
+	spin_lock_init(&wl->wl_lock);
 	wl->tx_mgmt_frm_rate = DEFAULT_HW_GEN_TX_RATE;
 	wl->tx_mgmt_frm_mod = DEFAULT_HW_GEN_MODULATION_TYPE;

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