linux-kernel - Re: [net PATCH v5 1/2] net: stmmac: move the EST lock to struct stmmac

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Date: Sat, 11 May 2024 18:37:48 +0100
From: Simon Horman <horms@...nel.org>
To: Xiaolei Wang <xiaolei.wang@...driver.com>
Cc: alexandre.torgue@...s.st.com, joabreu@...opsys.com, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	mcoquelin.stm32@...il.com, richardcochran@...il.com,
	bartosz.golaszewski@...aro.org, rohan.g.thomas@...el.com,
	rmk+kernel@...linux.org.uk, fancer.lancer@...il.com,
	ahalaney@...hat.com, netdev@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [net PATCH v5 1/2] net: stmmac: move the EST lock to struct
 stmmac_priv

On Fri, May 10, 2024 at 08:21:54PM +0800, Xiaolei Wang wrote:
> Reinitialize the whole EST structure would also reset the mutex
> lock which is embedded in the EST structure, and then trigger
> the following warning. To address this, move the lock to struct
> stmmac_priv. We also need to reacquire the mutex lock when doing
> this initialization.
> 
> DEBUG_LOCKS_WARN_ON(lock->magic != lock)
> WARNING: CPU: 3 PID: 505 at kernel/locking/mutex.c:587 __mutex_lock+0xd84/0x1068
>  Modules linked in:
>  CPU: 3 PID: 505 Comm: tc Not tainted 6.9.0-rc6-00053-g0106679839f7-dirty #29
>  Hardware name: NXP i.MX8MPlus EVK board (DT)
>  pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
>  pc : __mutex_lock+0xd84/0x1068
>  lr : __mutex_lock+0xd84/0x1068
>  sp : ffffffc0864e3570
>  x29: ffffffc0864e3570 x28: ffffffc0817bdc78 x27: 0000000000000003
>  x26: ffffff80c54f1808 x25: ffffff80c9164080 x24: ffffffc080d723ac
>  x23: 0000000000000000 x22: 0000000000000002 x21: 0000000000000000
>  x20: 0000000000000000 x19: ffffffc083bc3000 x18: ffffffffffffffff
>  x17: ffffffc08117b080 x16: 0000000000000002 x15: ffffff80d2d40000
>  x14: 00000000000002da x13: ffffff80d2d404b8 x12: ffffffc082b5a5c8
>  x11: ffffffc082bca680 x10: ffffffc082bb2640 x9 : ffffffc082bb2698
>  x8 : 0000000000017fe8 x7 : c0000000ffffefff x6 : 0000000000000001
>  x5 : ffffff8178fe0d48 x4 : 0000000000000000 x3 : 0000000000000027
>  x2 : ffffff8178fe0d50 x1 : 0000000000000000 x0 : 0000000000000000
>  Call trace:
>   __mutex_lock+0xd84/0x1068
>   mutex_lock_nested+0x28/0x34
>   tc_setup_taprio+0x118/0x68c
>   stmmac_setup_tc+0x50/0xf0
>   taprio_change+0x868/0xc9c
> 
> Fixes: b2aae654a479 ("net: stmmac: add mutex lock to protect est parameters")
> Signed-off-by: Xiaolei Wang <xiaolei.wang@...driver.com>

Reviewed-by: Simon Horman <horms@...nel.org>