linux-kernel - Re: [PATCH] hwmon: (ina3221) Fix read timeout issue

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Message-ID: <20191029014712.GA22268@roeck-us.net>
Date:   Mon, 28 Oct 2019 18:47:12 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Nicolin Chen <nicoleotsuka@...il.com>
Cc:     jdelvare@...e.com, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (ina3221) Fix read timeout issue

On Mon, Oct 21, 2019 at 05:59:22PM -0700, Nicolin Chen wrote:
> After introducing "samples" to the calculation of wait time, the
> driver might timeout at the regmap_field_read_poll_timeout call,
> because the wait time could be longer than the 100000 usec limit
> due to a large "samples" number.
> 
> So this patch sets the timeout limit to 2 times of the wait time
> in order to fix this issue.
> 
> Fixes: 5c090abf945b ("hwmon: (ina3221) Add averaging mode support")
> Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>

Applied.

Thanks,
Guenter

> ---
>  drivers/hwmon/ina3221.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c
> index ef37479991be..f335d0cb0c77 100644
> --- a/drivers/hwmon/ina3221.c
> +++ b/drivers/hwmon/ina3221.c
> @@ -213,7 +213,7 @@ static inline int ina3221_wait_for_data(struct ina3221_data *ina)
>  
>  	/* Polling the CVRF bit to make sure read data is ready */
>  	return regmap_field_read_poll_timeout(ina->fields[F_CVRF],
> -					      cvrf, cvrf, wait, 100000);
> +					      cvrf, cvrf, wait, wait * 2);
>  }
>  
>  static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg,