linux-kernel - Re: [linux-pm] [PATCH, fix] Re: [Regression] 2.6.31-git: tty change broke resume from hibernation on MSI Wind U100

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Message-ID: <Pine.LNX.4.44L0.0909280202280.14348-100000@netrider.rowland.org>
Date:	Mon, 28 Sep 2009 02:07:41 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Dave Young <hidave.darkstar@...il.com>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, Greg KH <gregkh@...e.de>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] [PATCH, fix] Re: [Regression] 2.6.31-git: tty change
  broke resume from hibernation on MSI Wind U100

On Mon, 28 Sep 2009, Dave Young wrote:

> On Mon, Sep 28, 2009 at 2:16 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > On Sunday 27 September 2009, Alan Stern wrote:
> >> On Sun, 27 Sep 2009, Rafael J. Wysocki wrote:
> >>
> >> > Tested, works.
> >> >
> >> > Greg, could you please consider taking the patch below? Â It fixes a recent
> >> > hibernation regression for me, so if not this one, another fix is necessary.
> >>
> >> This patch has a mistake.
> >>
> >> > Index: linux-2.6/drivers/usb/serial/usb-serial.c
> >> > ===================================================================
> >> > --- linux-2.6.orig/drivers/usb/serial/usb-serial.c
> >> > +++ linux-2.6/drivers/usb/serial/usb-serial.c
> >> > @@ -1210,7 +1210,7 @@ static const struct tty_operations seria
> >> > Â  Â  .chars_in_buffer = Â  Â  Â serial_chars_in_buffer,
> >> > Â  Â  .tiocmget = Â  Â  Â  Â  Â  Â  serial_tiocmget,
> >> > Â  Â  .tiocmset = Â  Â  Â  Â  Â  Â  serial_tiocmset,
> >> > - Â  .shutdown = Â  Â  Â  Â  Â  Â  serial_release,
> >> > + Â  .cleanup = Â  Â  Â  Â  Â  Â  Â serial_release,
> >> > Â  Â  .install = Â  Â  Â  Â  Â  Â  Â serial_install,
> >> > Â  Â  .proc_fops = Â  Â  Â  Â  Â  Â &serial_proc_fops,
> >> > Â };
> >>
> >> It isn't enough to change the method pointer. Â The code in
> >> serial_release() has to be changed too; it must not call tty_shutdown()
> >> any more.
> >
> > Would it be sufficient to remove the tty_shutdown() call from
> > serial_release()?
> 
> I think so, because standard shutdown will be called in queue_release_one_tty.
> 
> Alan, could you confirm about this?  Thus I'd like to update the patch.

Yes, that's right.  Just remove the function call.  But what happens if
the device is a serial console?  Shouldn't the call to tty_shutdown()  
be skipped in that case?  (Eventually this won't matter; the console
code will be straightened out so that we never release a serial console
device.  But for now it's important.)

If you think it would be appropriate, you could also rename
serial_release() to serial_cleanup() -- it's up to you.

Alan Stern

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