linux-kernel - Re: [PATCH] USB: serial: mos7720: fix parallel-port state restore

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Message-ID: <20201105080557.GZ4085@localhost>
Date:   Thu, 5 Nov 2020 09:05:57 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Johan Hovold <johan@...nel.org>, linux-usb@...r.kernel.org,
        Davidlohr Bueso <dave@...olabs.net>,
        linux-kernel@...r.kernel.org, stable <stable@...r.kernel.org>
Subject: Re: [PATCH] USB: serial: mos7720: fix parallel-port state restore

On Wed, Nov 04, 2020 at 05:59:10PM +0100, Greg Kroah-Hartman wrote:
> On Wed, Nov 04, 2020 at 05:47:27PM +0100, Johan Hovold wrote:
> > The parallel-port restore operations is called when a driver claims the
> > port and is supposed to restore the provided state (e.g. saved when
> > releasing the port).
> > 
> > Fixes: b69578df7e98 ("USB: usbserial: mos7720: add support for parallel port on moschip 7715")
> > Cc: stable <stable@...r.kernel.org>     # 2.6.35
> > Signed-off-by: Johan Hovold <johan@...nel.org>
> > ---
> >  drivers/usb/serial/mos7720.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
> > index 5eed1078fac8..5a5d2a95070e 100644
> > --- a/drivers/usb/serial/mos7720.c
> > +++ b/drivers/usb/serial/mos7720.c
> > @@ -639,6 +639,8 @@ static void parport_mos7715_restore_state(struct parport *pp,
> >  		spin_unlock(&release_lock);
> >  		return;
> >  	}
> > +	mos_parport->shadowDCR = s->u.pc.ctr;
> > +	mos_parport->shadowECR = s->u.pc.ecr;
> 
> Wow that's old code.  I'm guessing no one uses these devices really :(

Possibly, but this would still work as long as you don't switch parallel
port driver without disconnecting the mos7715 device in between.

> Anyway, nice work:
> 
> Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Thanks, now applied for -next.

Johan