linux-kernel - Re: [PATCH] USB: Avoid PM error messages during resume if a device was disconnected

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Date:	Thu, 4 Jun 2009 14:02:48 -0700
From:	Greg KH <greg@...ah.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Greg KH <gregkh@...e.de>, Alan Stern <stern@...land.harvard.edu>,
	Frans Pop <elendil@...net.nl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-usb@...r.kernel.org
Subject: Re: [PATCH] USB: Avoid PM error messages during resume if a device
	was disconnected

On Thu, Jun 04, 2009 at 10:30:48PM +0200, Rafael J. Wysocki wrote:
> From: Frans Pop <elendil@...net.nl>
> 
> Currently if a laptop is suspended e.g. while docked and then resumed after
> undocking it, the following errors get generated because the USB hub in the
> docking station and the devices connected to it are no longer available:
> pm_op(): usb_dev_resume+0x0/0x10 returns -19
> PM: Device 1-2 failed to resume: error -19
> pm_op(): usb_dev_resume+0x0/0x10 returns -19
> PM: Device 1-2.2 failed to resume: error -19
> pm_op(): usb_dev_resume+0x0/0x10 returns -19
> PM: Device 1-2.3 failed to resume: error -19
> 
> As the removal of USB devices while a system is suspended is a relatively
> common use case and in most cases not an error, just return success on
> -ENODEV. The user gets informed anyway as the USB subsystem generates
> regular disconnect messages for the devices shortly afterwards:
> usb 1-2: USB disconnect, address 3
> usb 1-2.2: USB disconnect, address 4
> usblp0: removed
> usb 1-2.3: USB disconnect, address 5
> 
> Signed-off-by: Frans Pop <elendil@...net.nl>
> Acked-by: Alan Stern <stern@...land.harvard.edu>
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> ---
> Hi Greg,
> 
> I can take this patch to the suspend tree, but if you think it should go
> through USB, please consider including it into the 2.6.31 push.

I've now queued it up in my usb tree, as that is probably the best place
for it.

thanks,

greg k-h
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