linux-kernel - Re: [34-stable regression] USB delay init quirk causes device events loss

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Date:	Mon, 13 Sep 2010 16:23:10 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	phil@...m.com, stable@...nel.org, Greg KH <gregkh@...e.de>,
	USB list <linux-usb@...r.kernel.org>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [34-stable regression] USB delay init quirk causes device events
 loss

On 09/13/2010 04:16 PM, Alan Stern wrote:
> On Mon, 13 Sep 2010, Jiri Slaby wrote:
>> The problem is that the patch shuffles with usb_detect_quirks which used
>> to disable autosuspend by default. Apparently it no longer does.
> 
> I don't see how that patch could have the effect you claim.  
> usb_detect_quirks still calls usb_disable_autosuspend.  Can you do a 
> little more debugging to find out why it isn't working as expected?  
> Reverting the commit is not a good solution.

Ok, I could, but I have a near-zero knowledge about usb core stuff. What
I see is that usb_detect_quirks moved from usb_new_device to
hub_port_connect_change. Might that be that there are broken devices
which doesn't generate state changes properly?

In other words, what I could do is to add some printks into
hub_port_connect_change if that's called at all. If you need some
thorough debugging printks, please send me a patch to test instead.

thanks,
-- 
js
suse labs
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