netdev - Re: [PATCH net-next 08/11] ptp: ocp: Add sysfs attribute utc_tai

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Message-ID: <20210902165719.4et2m5s7jgrcvac4@bsd-mbp.dhcp.thefacebook.com>
Date:   Thu, 2 Sep 2021 09:57:19 -0700
From:   Jonathan Lemon <jonathan.lemon@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem@...emloft.net, richardcochran@...il.com,
        netdev@...r.kernel.org, kernel-team@...com, abyagowi@...com
Subject: Re: [PATCH net-next 08/11] ptp: ocp: Add sysfs attribute
 utc_tai_offset

On Wed, Sep 01, 2021 at 04:56:42PM -0700, Jakub Kicinski wrote:
> On Mon, 30 Aug 2021 16:52:33 -0700 Jonathan Lemon wrote:
> > +static ssize_t
> > +utc_tai_offset_show(struct device *dev,
> > +		    struct device_attribute *attr, char *buf)
> > +{
> > +	struct ptp_ocp *bp = dev_get_drvdata(dev);
> > +
> > +	return sysfs_emit(buf, "%d\n", bp->utc_tai_offset);
> > +}
> > +
> > +static ssize_t
> > +utc_tai_offset_store(struct device *dev,
> > +		     struct device_attribute *attr,
> > +		     const char *buf, size_t count)
> > +{
> > +	struct ptp_ocp *bp = dev_get_drvdata(dev);
> > +	unsigned long flags;
> > +	int err;
> > +	s32 val;
> > +
> > +	err = kstrtos32(buf, 0, &val);
> > +	if (err)
> > +		return err;
> > +
> > +	bp->utc_tai_offset = val;
> 
> This line should probably be under the lock.

Ack.

BTW, I hate this entire function - but don't really 
see a better way to handle it.  One suggestion was 
to automatically get the offset from the NMEA parser,
but I can't depend on GNSS being available.
-- 
Jonathan