linux-kernel - Re: [PATCH v2] usb hub: send clear_tt_buffer_complete events when canceling TT clear work

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Message-ID: <Pine.LNX.4.44L0.1210011544570.1183-100000@iolanthe.rowland.org>
Date:	Mon, 1 Oct 2012 15:45:46 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Octavian Purdila <octavian.purdila@...el.com>
cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] usb hub: send clear_tt_buffer_complete events when
 canceling TT clear work

On Mon, 1 Oct 2012, Octavian Purdila wrote:

> There is a race condition in the USB hub code with regard to handling
> TT clear requests that can get the HCD driver in a deadlock. Usually
> when an TT clear request is scheduled it will be executed immediately:

...

> This patch changes hub_quiesce behavior to flush the TT clear work
> instead of canceling it, to make sure that no TT clear request remains
> uncompleted before suspend.
> 
> Signed-off-by: Octavian Purdila <octavian.purdila@...el.com>

Acked-by: Alan Stern <stern@...land.harvard.edu>

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