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

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Date:	Fri, 13 Sep 2013 18:22:07 +0200
From:	Paul Chavent <Paul.Chavent@...ra.fr>
To:	Johan Hovold <jhovold@...il.com>
CC:	linux-usb@...r.kernel.org, gregkh@...uxfoundation.org,
	fschaefer.oss@...glemail.com, jslaby@...e.cz, max@...e.de,
	giometti@...eenne.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] USB : serial : pl2303 wake up after dcd status check.

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@...ra.fr>
>> ---
>>   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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