linux-kernel - Re: [External][PATCH] power: supply: bq2415x: fix deadlock in bq2415x_set

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Date:   Sun, 15 Aug 2021 23:53:37 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Kezhou Li <kezhou.li@...no.com>
Cc:     pali@...nel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [External][PATCH] power: supply: bq2415x: fix deadlock in
 bq2415x_set_autotimer

Hi,

On Mon, Jun 21, 2021 at 08:14:20PM +0800, Kezhou Li wrote:
> From: "Kezhou Li" <kezhou.li@...no.com>
> 
> The bq2415x_timer_error called by bq2415x_timer_work when some error
> happens, and then calls cancel_delayed_work_sync(&bq->work). Finally
> this function is waiting for the work to finish but the work is
> waiting for the return of the function. So it causes a deadlock.
> 
> Signed-off-by: Kezhou Li <kezhou.li@...no.com>
> ---

The patch is not correct, since bq2415x_sysfs_set_timer() should
call cancel_delayed_work_sync() for the "off" case.

-- Sebastian

>  drivers/power/supply/bq2415x_charger.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/power/supply/bq2415x_charger.c b/drivers/power/supply/bq2415x_charger.c
> index 5724001..7889edb 100644
> --- a/drivers/power/supply/bq2415x_charger.c
> +++ b/drivers/power/supply/bq2415x_charger.c
> @@ -862,8 +862,6 @@ static void bq2415x_set_autotimer(struct bq2415x_device *bq, int state)
>  		schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
>  		bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
>  		bq->timer_error = NULL;
> -	} else {
> -		cancel_delayed_work_sync(&bq->work);
>  	}
>  
>  	mutex_unlock(&bq2415x_timer_mutex);
> -- 
> 1.9.1
> 

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