linux-kernel - Re: [PATCH v3 0/6] TTY: port hangup and close fixes

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Date:	Fri, 15 Mar 2013 10:29:21 +0100
From:	Johan Hovold <jhovold@...il.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Johan Hovold <jhovold@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-usb@...r.kernel.org, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/6] TTY: port hangup and close fixes

On Wed, Mar 13, 2013 at 03:50:32PM -0400, Peter Hurley wrote:
> On Thu, 2013-03-07 at 15:55 +0100, Johan Hovold wrote:
> > These patches against 3.9-rc1 fix a few issues with tty-port hangup and
> > close.
> > 
> > The first and fifth patch are essentially clean ups.
> > 
> > The second and third patch fix the fact that DTR could get raised
> > (rather than dropped) at hangup if there are blocked opens. [ Note that
> > the second patch has been separated into its own patch and that the
> > third patch is new in v3 of this series. ]
> > 
> > The fourth patch makes sure DTR is dropped also on hangup and that DTR
> > is only dropped for initialised ports (where it could have been raised
> > in the first place).
> > 
> > The sixth and final patch, makes sure no tty callbacks are made from
> > tty_port_close_start when the port has not been initialised (successfully
> > opened). This was previously only done for wait_until_sent but there's
> > no reason to call flush_buffer or to honour port drain delay either.
> > The latter could cause a failed open to stall for up to two seconds.
> > 
> > As a side-effect, these patches also fix an issue in USB-serial where we
> > could get tty-port callbacks on an uninitialised port after having hung
> > up and unregistered a device after disconnect.
> > 
> > Johan
> > 
> > 
> > v3: 
> >  - amend series with fix of DTR sometimes being raised on hang-up
> >  - do not lower DTR on hangup if port tty is gone
> >  - make sure tty in call to shutdown is refcounted
> >  - use cflag-macros throughout
> 
> Other than the comments for patch 3/6, this series looks good. Thanks
> again for your work on this.

As I mentioned in my reply to 3/6, fixing bugs in other drivers not
using the tty-port implementation is all good but not the purpose of
this series.

Thanks,
Johan
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