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

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Date:	Thu, 8 Oct 2009 23:31:50 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Oliver Neukum <oliver@...kum.org>, 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

> update the last_busy time in the completion of every input URB).  When
> the driver is throttled no URBs will be submitted, so the usage count
> will remain at 0 with no effort on the part of throttle().

You can still get modem changes (set_mctrl), break etc with the port
throttled, or indeed output.

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