linux-kernel - Re: [PATCH V5 3/3] hwmon: pwm-fan: Add RPM support via external interrupt

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Date:   Fri, 12 Apr 2019 06:50:08 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Robin Murphy <robin.murphy@....com>,
        Stefan Wahren <stefan.wahren@...e.com>
Cc:     Kamil Debski <kamil@...as.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Jean Delvare <jdelvare@...e.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 3/3] hwmon: pwm-fan: Add RPM support via external
 interrupt

On 4/12/19 4:50 AM, Robin Murphy wrote:
> On 12/04/2019 12:07, Stefan Wahren wrote:
>> On 11.04.19 18:57, Guenter Roeck wrote:
>>> On Thu, Apr 11, 2019 at 03:30:11PM +0200, Stefan Wahren wrote:
>>>>    
>>>> -ATTRIBUTE_GROUPS(pwm_fan);
>>>> +static umode_t pwm_fan_attrs_visible(struct kobject *kobj, struct attribute *a,
>>>> +				     int n)
>>>> +{
>>>> +	struct device *dev = container_of(kobj, struct device, kobj);
>>>> +	struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
>>>> +	struct device_attribute *devattr;
>>>> +
>>>> +	/* Hide fan_input in case no interrupt is available  */
>>>> +	devattr = container_of(a, struct device_attribute, attr);
>>> Field day for static analyzers - devattr is no longer used.
>>> No need to resend. I'll let the series rest for a couple of days
>>> and then apply to hwmon-next (after removing devattr) unless there are
>>> additional comments.
>>>
>> Thank you
> 
> FWIW you can have a
> 
> Reviewed-by: Robin Murphy <robin.murphy@....com>
> 
> for the whole series. The only minor comment that springs to mind
> isn't actually specific to this patch, so is probably best made as
> the follow-up below.
> 
> Robin.
> 

Any chance you can send the patch below as separate patch ? I track patches
using patchwork, and attachments don't show up there.

Thanks,
Guenter

> ----->8-----
> From: Robin Murphy <robin.murphy@....com>
> Subject: [PATCH] hwmon: pwm-fan: Report probe errors consistently
> 
> Printing the error code for a failure provides a head-start for
> debugging, since it's often sufficient to pinpoint the origin of the
> failure. We already do this for some probe-failure messages, so let's
> make the rest of them consistent.
> 
> Signed-off-by: Robin Murphy <robin.murphy@....com>
> ---
>   drivers/hwmon/pwm-fan.c | 13 ++++++++-----
>   1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
> index 8c4c5eefd4ca..556db4bef743 100644
> --- a/drivers/hwmon/pwm-fan.c
> +++ b/drivers/hwmon/pwm-fan.c
> @@ -330,7 +330,7 @@ static int pwm_fan_probe(struct platform_device *pdev)
> 
>   	ret = pwm_apply_state(ctx->pwm, &state);
>   	if (ret) {
> -		dev_err(&pdev->dev, "Failed to configure PWM\n");
> +		dev_err(&pdev->dev, "Failed to configure PWM: %d\n", ret);
>   		goto err_reg_disable;
>   	}
> 
> @@ -348,7 +348,8 @@ static int pwm_fan_probe(struct platform_device *pdev)
>   		ret = devm_request_irq(&pdev->dev, ctx->irq, pulse_handler, 0,
>   				       pdev->name, ctx);
>   		if (ret) {
> -			dev_err(&pdev->dev, "Can't get interrupt working.\n");
> +			dev_err(&pdev->dev,
> +				"Failed to request interrupt: %d\n", ret);
>   			goto err_pwm_disable;
>   		}
>   		ctx->sample_start = ktime_get();
> @@ -358,8 +359,9 @@ static int pwm_fan_probe(struct platform_device *pdev)
>   	hwmon = devm_hwmon_device_register_with_groups(&pdev->dev, "pwmfan",
>   						       ctx, pwm_fan_groups);
>   	if (IS_ERR(hwmon)) {
> -		dev_err(&pdev->dev, "Failed to register hwmon device\n");
>   		ret = PTR_ERR(hwmon);
> +		dev_err(&pdev->dev,
> +			"Failed to register hwmon device: %d\n", ret);
>   		goto err_del_timer;
>   	}
> 
> @@ -373,9 +375,10 @@ static int pwm_fan_probe(struct platform_device *pdev)
>   							  "pwm-fan", ctx,
>   							  &pwm_fan_cooling_ops);
>   		if (IS_ERR(cdev)) {
> -			dev_err(&pdev->dev,
> -				"Failed to register pwm-fan as cooling device");
>   			ret = PTR_ERR(cdev);
> +			dev_err(&pdev->dev,
> +				"Failed to register pwm-fan as cooling device: %d\n",
> +				ret);
>   			goto err_del_timer;
>   		}
>   		ctx->cdev = cdev;
>