linux-kernel - Re: [PATCH 2/3] hwmon (occ): Prevent sysfs error attribute from returning error

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Message-ID: <20190416221414.GA32126@roeck-us.net>
Date:   Tue, 16 Apr 2019 15:14:14 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        jdelvare@...e.com, andrew@...id.au, mine260309@...il.com
Subject: Re: [PATCH 2/3] hwmon (occ): Prevent sysfs error attribute from
 returning error

On Tue, Apr 16, 2019 at 03:43:49PM +0000, Eddie James wrote:
> The error sysfs attribute returns the stored error state of the OCC and
> doesn't depend on the OCC poll response. Therefore, split the error
> attribute into it's own function to avoid failing out of the function if
> the poll response fails.
> 
> Signed-off-by: Eddie James <eajames@...ux.ibm.com>

Applied.

Thanks,
Guenter

> ---
>  drivers/hwmon/occ/sysfs.c | 19 +++++++++++++------
>  1 file changed, 13 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/hwmon/occ/sysfs.c b/drivers/hwmon/occ/sysfs.c
> index 1cb1e65..c73be07 100644
> --- a/drivers/hwmon/occ/sysfs.c
> +++ b/drivers/hwmon/occ/sysfs.c
> @@ -63,9 +63,6 @@ static ssize_t occ_sysfs_show(struct device *dev,
>  		else
>  			val = 1;
>  		break;
> -	case 8:
> -		val = occ->error;
> -		break;
>  	default:
>  		return -EINVAL;
>  	}
> @@ -73,6 +70,16 @@ static ssize_t occ_sysfs_show(struct device *dev,
>  	return snprintf(buf, PAGE_SIZE - 1, "%d\n", val);
>  }
>  
> +static ssize_t occ_error_show(struct device *dev,
> +			      struct device_attribute *attr, char *buf)
> +{
> +	struct occ *occ = dev_get_drvdata(dev);
> +
> +	occ_update_response(occ);
> +
> +	return snprintf(buf, PAGE_SIZE - 1, "%d\n", occ->error);
> +}
> +
>  static SENSOR_DEVICE_ATTR(occ_master, 0444, occ_sysfs_show, NULL, 0);
>  static SENSOR_DEVICE_ATTR(occ_active, 0444, occ_sysfs_show, NULL, 1);
>  static SENSOR_DEVICE_ATTR(occ_dvfs_overtemp, 0444, occ_sysfs_show, NULL, 2);
> @@ -81,7 +88,7 @@ static SENSOR_DEVICE_ATTR(occ_mem_throttle, 0444, occ_sysfs_show, NULL, 4);
>  static SENSOR_DEVICE_ATTR(occ_quick_pwr_drop, 0444, occ_sysfs_show, NULL, 5);
>  static SENSOR_DEVICE_ATTR(occ_state, 0444, occ_sysfs_show, NULL, 6);
>  static SENSOR_DEVICE_ATTR(occs_present, 0444, occ_sysfs_show, NULL, 7);
> -static SENSOR_DEVICE_ATTR(occ_error, 0444, occ_sysfs_show, NULL, 8);
> +static DEVICE_ATTR_RO(occ_error);
>  
>  static struct attribute *occ_attributes[] = {
>  	&sensor_dev_attr_occ_master.dev_attr.attr,
> @@ -92,7 +99,7 @@ static struct attribute *occ_attributes[] = {
>  	&sensor_dev_attr_occ_quick_pwr_drop.dev_attr.attr,
>  	&sensor_dev_attr_occ_state.dev_attr.attr,
>  	&sensor_dev_attr_occs_present.dev_attr.attr,
> -	&sensor_dev_attr_occ_error.dev_attr.attr,
> +	&dev_attr_occ_error.attr,
>  	NULL
>  };
>  
> @@ -156,7 +163,7 @@ void occ_sysfs_poll_done(struct occ *occ)
>  	}
>  
>  	if (occ->error && occ->error != occ->prev_error) {
> -		name = sensor_dev_attr_occ_error.dev_attr.attr.name;
> +		name = dev_attr_occ_error.attr.name;
>  		sysfs_notify(&occ->bus_dev->kobj, NULL, name);
>  	}
>