linux-kernel - Re: [RFC] cdc-acm: Fix potential deadlock (lockdep warning)

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Message-ID: <CAFQmdRZEk53fxa6CdFxMNWFH4y9eUu+MeKRxFnnYrgn8J1sAvw@mail.gmail.com>
Date:	Wed, 23 Nov 2011 13:03:27 -0800
From:	Havard Skinnemoen <hskinnemoen@...gle.com>
To:	Alan Cox <alan@...ux.intel.com>
Cc:	Jiri Slaby <jslaby@...e.cz>, Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Jiri Slaby <jirislaby@...il.com>
Subject: Re: [RFC] cdc-acm: Fix potential deadlock (lockdep warning)

On Wed, Nov 23, 2011 at 11:44 AM, Alan Cox <alan@...ux.intel.com> wrote:
> Any data owned by the USB part needs to be handled by the USB driver.
> In the case of usb-serial it keeps its own krefs for that because the
> lifetime of the port/USB serial data is not the same as the lifetime of
> the tty itself.

Yes, exactly. But since tty_port already has a kref, why not use that?
It doesn't have any other use currently.

Hmm, a quick grep tells me tty_port_get() and tty_port_put() are
completely unused. What was the intention behind them?

Havard
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