netdev - Re: [PATCH net-next 10/11] ptp: ocp: Add IRIG-B output mode control

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Message-ID: <20210902170216.gvjwkocvoosbdkdm@bsd-mbp.dhcp.thefacebook.com>
Date:   Thu, 2 Sep 2021 10:02:16 -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 10/11] ptp: ocp: Add IRIG-B output mode control

On Wed, Sep 01, 2021 at 05:07:00PM -0700, Jakub Kicinski wrote:
> On Mon, 30 Aug 2021 16:52:35 -0700 Jonathan Lemon wrote:
> > +	err = kstrtou8(buf, 0, &val);
> > +	if (err)
> > +		return err;
> > +	if (val > 7)
> > +		return -EINVAL;
> > +
> > +	reg = ((val & 0x7) << 16);
> > +
> > +	spin_lock_irqsave(&bp->lock, flags);
> > +	iowrite32(0, &bp->irig_out->ctrl);		/* disable */
> > +	iowrite32(reg, &bp->irig_out->ctrl);		/* change mode */
> > +	iowrite32(reg | IRIG_M_CTRL_ENABLE, &bp->irig_out->ctrl);
> > +	spin_unlock_irqrestore(&bp->lock, flags);
> 
> locking

Not sure what you mean - all register manipulations are 
already done under the lock here.
-- 
Jonathan