Date: Mon, 19 Jan 2009 17:36:02 -0800
From: Greg KH <gregkh@suse.de>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Alan Stern <stern@rowland.harvard.edu>,
       Andrew Morton <akpm@linux-foundation.org>,
       Andrey Borzenkov <arvidjaar@mail.ru>,
       LKML <linux-kernel@vger.kernel.org>,
       USB list <linux-usb@vger.kernel.org>,
       pm list <linux-pm@lists.linux-foundation.org>,
       Christian Borntraeger <borntraeger@de.ibm.com>,
       Zdenek Kabelac <zdenek.kabelac@gmail.com>, Ingo Molnar <mingo@elte.hu>,
       Jeff Chua <jeff.chua.linux@gmail.com>
Subject: Re: [PATCH] USB: Fix suspend-resume of PCI USB controllers
Message-ID: <20090120013602.GA8377@suse.de>
References: <200901200126.57839.rjw@sisk.pl>
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On Tue, Jan 20, 2009 at 01:26:56AM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@sisk.pl>
> 
> Commit a0d4922da2e4ccb0973095d8d29f36f6b1b5f703
> (USB: fix up suspend and resume for PCI host controllers) attempted
> to fix the suspend-resume of PCI USB controllers, but unfortunately
> it did that incorrectly and interrupts are left enabled by the USB
> controllers' ->suspend_late() callback as a result.  This leads to
> serious problems during suspend which are very difficult to debug.
> 
> Fix the issue by removing the ->suspend_late() callback of PCI
> USB controllers and moving the code from there to the ->suspend()
> callback executed with interrupts enabled.  Additionally, make
> the ->resume() callback of PCI USB controllers execute
> pci_enable_wake(dev, PCI_D0, false) to disable wake-up from the
> full power state (PCI_D0).
> 
> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
> Tested-by: Andrey Borzenkov <arvidjaar@mail.ru>
> Tested-by: "Jeff Chua" <jeff.chua.linux@gmail.com>
> Cc: Alan Stern <stern@rowland.harvard.edu>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Christian Borntraeger <borntraeger@de.ibm.com>
> Cc: "Zdenek Kabelac" <zdenek.kabelac@gmail.com>
> Cc: Ingo Molnar <mingo@elte.hu>


Alan, does this look ok for you?

thanks,

greg k-h
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