linux-kernel - Re: Patch "USB: serial: mos7840: Supported MCS7810 device"

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Date:	Fri, 13 Apr 2012 13:57:10 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Donald" <donald@...x.com.tw>
Cc:	"'Greg KH'" <gregkh@...uxfoundation.org>,
	"'open list:USB SUBSYSTEM'" <linux-usb@...r.kernel.org>,
	"'open list'" <linux-kernel@...r.kernel.org>
Subject: Re: Patch "USB: serial: mos7840: Supported MCS7810 device"

On Fri, 13 Apr 2012 10:20:52 +0800
"Donald" <donald@...x.com.tw> wrote:

> Hi Alan,
> 
> Thank you for your reply. As for your comment regarding the LED feature flag, the driver can provide a flag parameter for LED
> feature so that users will be able to set this LED feature at loading the driver, and by default, this flag is set false (LED
> feature is disabled). Could you let me know if this is what exactly matches your comment?

What I mean is that all over the code you have added

if (serial->num_ports == 1 && mos7840_port->...)


If a future device has LEDs and multiple ports, or a future device has
one port and no LED then all of them will need changing.

Instead if you had code in one place at initialisation which did


	if (type == 7840 && serial->num_ports == 1)
			mos7840_port->has_led = true;


then elsewhere did


	if (mos7840_port->has_led && ....)


then it will avoid problems in the future.

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