linux-kernel - Re: [PATCH] soundwire: stream: fix bad unlock balance

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Message-ID: <dd34d1ba-b8b6-7882-3e71-d036a97f41df@linaro.org>
Date:   Wed, 22 May 2019 17:41:44 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     vkoul@...nel.org
Cc:     sanyog.r.kale@...el.com, pierre-louis.bossart@...ux.intel.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soundwire: stream: fix bad unlock balance



On 22/05/2019 17:25, Srinivas Kandagatla wrote:
> This patch fixes below warning due to unlocking without locking.
> 
>   =====================================
>   WARNING: bad unlock balance detected!
>   5.1.0-16506-gc1c383a6f0a2-dirty #1523 Tainted: G        W
>   -------------------------------------
>   aplay/2954 is trying to release lock (&bus->msg_lock) at:
>   do_bank_switch+0x21c/0x480
>   but there are no more locks to release!
> 
> Signed-off-by: Srinivas Kandagatla<srinivas.kandagatla@...aro.org>
> ---
>   drivers/soundwire/stream.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
> index 544925ff0b40..d16268f30e4f 100644
> --- a/drivers/soundwire/stream.c
> +++ b/drivers/soundwire/stream.c
> @@ -814,7 +814,8 @@ static int do_bank_switch(struct sdw_stream_runtime *stream)
>   			goto error;
>   		}
>   
> -		mutex_unlock(&bus->msg_lock);
> +		if (mutex_is_locked(&bus->msg_lock))
> +			utex_unlock(&bus->msg_lock);
Looks like I messed this up!

I will resend this one!

--srini
>   	}