Re: [PATCH 3/3] USB : serial : pl2303 wake up after dcd status check.

[Paul Chavent]

Hi.

This patch was just a suggestion. Don't bother with rebasing. I will 
wait your changes and remove this patch from the next submission.

Cheers.
Paul.


On 09/13/2013 06:23 PM, Johan Hovold wrote:
> On Fri, Sep 13, 2013 at 05:35:13PM +0200, Paul Chavent wrote:
> > Seems to be done this way in other drivers (ch341, 8250, ...).
> > And get tty reference only if dcd_change need to be called.
>
> This is fine. I have a patch here doing the same two changes as part of
> a larger clean-up of the pl2303 interrupt handling (which in turn is
> part of the MSR-refactoring I mentioned). I could rebase on top of this,
> unless you care to wait another week. :)
>
> Thanks,
> Johan
>
> > Signed-off-by: Paul Chavent <paul.chavent@xxxxxxxx>
> > ---
> >   drivers/usb/serial/pl2303.c | 17 +++++++++--------
> >   1 file changed, 9 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
> > index e7a84f0..8b81188 100644
> > --- a/drivers/usb/serial/pl2303.c
> > +++ b/drivers/usb/serial/pl2303.c
> > @@ -854,15 +854,16 @@ static void pl2303_update_line_status(struct usb_serial_port *port,
> >   	spin_unlock_irqrestore(&priv->lock, flags);
> >   	if (priv->line_status & UART_BREAK_ERROR)
> >   		usb_serial_handle_break(port);
> > -	wake_up_interruptible(&port->port.delta_msr_wait);
> >
> > -	tty = tty_port_tty_get(&port->port);
> > -	if (!tty)
> > -		return;
> > -	if ((priv->line_status ^ prev_line_status) & UART_DCD)
> > -		usb_serial_handle_dcd_change(port, tty,
> > -				priv->line_status & UART_DCD);
> > -	tty_kref_put(tty);
> > +	if ((priv->line_status ^ prev_line_status) & UART_DCD) {
> > +		tty = tty_port_tty_get(&port->port);
> > +		if (tty)
> > +			usb_serial_handle_dcd_change(port, tty,
> > +					priv->line_status & UART_DCD);
> > +		tty_kref_put(tty);
> > +	}
> > +
> > +	wake_up_interruptible(&port->port.delta_msr_wait);
> >   }
> >
> >   static void pl2303_read_int_callback(struct urb *urb)
> > --
> > 1.7.12.1
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