linux-kernel - Re: [PATCH 4/5] usb_serial: Kill port mutex

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Message-ID: <20091008221901.2321cca6@lxorguk.ukuu.org.uk>
Date:	Thu, 8 Oct 2009 22:19:01 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Alan Stern <stern@...land.harvard.edu>, Greg KH <greg@...ah.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 4/5] usb_serial: Kill port mutex

On Thu, 8 Oct 2009 22:40:36 +0200
Oliver Neukum <oliver@...kum.org> wrote:

> Am Donnerstag, 8. Oktober 2009 22:06:10 schrieb Alan Stern:
> 
> >
> > On further thought, unthrottle should autoresume if the device is
> > open and autosuspended (but it shouldn't do anything if the device is
> > suspended).  After all, the reason for the autosuspend may have been
> > the lack of activity caused by the throttling.
> >
> > In practice this isn't likely to come up.  It would be surprising if
> > throttling lasted long enough to cause an autosuspend or if the core
> > decided to throttle while the device was autosuspended and hence idle.
> 
> So you say that throttle() should do an autopm_put?

You need to be very very sure you cannot lose a byte of data or have the
modem lines disrupted in any way if you do that.
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