linux-kernel - Re: [PATCH RFC 4/5] usb: cdc-acm: Enable serdev support

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Date:   Mon, 07 Jan 2019 14:48:26 +0100
From:   Oliver Neukum <oneukum@...e.com>
To:     Andreas Färber <afaerber@...e.de>,
        linux-lpwan@...ts.infradead.org, linux-serial@...r.kernel.org
Cc:     Johan Hovold <johan@...nel.org>, Rob Herring <robh@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH RFC 4/5] usb: cdc-acm: Enable serdev support

On Fr, 2019-01-04 at 12:21 +0100, Andreas Färber  wrote:
> Switch from tty_port_register_device() to tty_port_register_device_serdev()
> and from tty_unregister_device() to tty_port_unregister_device().
> 
> On removal of a serdev driver sometimes count mismatch warnings were seen:
> 
>   ttyACM ttyACM0: tty_hangup: tty->count(1) != (#fd's(0) + #kopen's(0))
>   ttyACM ttyACM0: tty_port_close_start: tty->count = 1 port count = 0
> 
> Note: The serdev drivers appear to probe asynchronously as soon as they
> are registered. Should the USB quirks in probe be moved before registration?
> No noticeable difference for the devices at hand.

That is quite drastic a change.
Johan, how complete in terms of features is serdev?

Are you refering to CLEAR_HALT_CONDITIONS in terms of quirks?

	Regards
		Oliver