linux-kernel - Re: [PATCH v2 1/3] hwmon: tmp421: handle I2C errors

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Date:   Fri, 24 Sep 2021 04:35:47 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Paul Fertser <fercerpav@...il.com>
Cc:     linux-hwmon@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] hwmon: tmp421: handle I2C errors

On Fri, Sep 24, 2021 at 10:44:50AM +0300, Paul Fertser wrote:
> Hello Guenter,
> 
> On Thu, Sep 23, 2021 at 07:20:20PM -0700, Guenter Roeck wrote:
> > > --- a/drivers/hwmon/tmp421.c
> > > +++ b/drivers/hwmon/tmp421.c
> > > @@ -93,7 +93,7 @@ struct tmp421_data {
> > >  	struct hwmon_channel_info temp_info;
> > >  	const struct hwmon_channel_info *info[2];
> > >  	struct hwmon_chip_info chip;
> > > -	char valid;
> > > +	bool valid;
> > 
> > This is a cleanup, not a bug fix, and it isn't even mentioned
> > in the patch description.
> 
> For the bug fix I needed to add a line setting data->valid to false
> and was reluctant to assign 0 instead as it would be adding more wrong
> (type-wise) code. But since you say that's the way to go, sure, will
> do.

I figured that much, but it is still an unrelated change. I don't object
to making that change, but it should still be a separate patch. FWIW,
I don't mind if it is in a single patch if the code won't be applied
to stable releases, but it should still be mentioned in the description
(eg: while at it, convert 'valid' to boolean).

> 
> Regarding the cleanup, I see hwmon has many examples of "char valid"
> and so it might make sense to do them all at once. What would be the
> procedure here, is that a desired change at all and if yes, how to
> approach doing it? 

You could write a coccinelle script to detect and convert all uses,
then submit a single patch to convert all drivers, with the cocconelle
script as reference in the commit log.

Guenter