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

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Message-ID: <20201104165910.GA2342981@kroah.com>
Date:   Wed, 4 Nov 2020 17:59:10 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     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 05:47:27PM +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 :(

Anyway, nice work:

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

>  	write_parport_reg_nonblock(mos_parport, MOS7720_DCR,
>  				   mos_parport->shadowDCR);
>  	write_parport_reg_nonblock(mos_parport, MOS7720_ECR,
> -- 
> 2.26.2
>