linux-kernel - Re: [PATCH v2 2/4] blk-integrity: convert to struct device

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Date:   Sat, 18 Mar 2023 16:54:26 +0000
From:   Thomas Weißschuh <linux@...ssschuh.net>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH v2 2/4] blk-integrity: convert to struct device_attribute

On Wed, Mar 15, 2023 at 08:03:00AM -0700, Christoph Hellwig wrote:
> > +		container_of(attr, struct device_attribute, attr);
> >  	ssize_t ret = 0;
> >  
> > +	if (dev_attr->store)
> > +		ret = dev_attr->store(dev, dev_attr, page, count);
> >  
> >  	return ret;
> 
> This can be simplified to:
> 
> 	if (!rev_attr->store)
> 		return 0;
> 	return dev_attr->store(dev, dev_attr, page, count);
> 
> (I'm still confused why 0 is the right return value here, but that's not
>  new in your patch, so better don't rock that boat).

This indeed looks weird.

Please note that this case will become -EIO in the next patch switching
over to the standard dev_sysfs_ops.

It shouldn't matter though as all writable attributes all have the
store() handler defined.

> > +static ssize_t format_show(struct device *dev, struct device_attribute *attr, char *page)
> 
> Please avoid the overly long line here. an in the other methods.

This was following the "new" 100-characters per line limit.
The new revision will follow the limit with 80.