linux-kernel - Re: [PATCH 0/7] HID: picoLCD updates

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Date:	Wed, 15 Aug 2012 23:32:05 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fbdev@...r.kernel.org
Subject: Re: [PATCH 0/7] HID: picoLCD updates

On Wed, 15 Aug 2012, Bruno Prémont wrote:

> > I see. Alan Stern has fixed a huge pile of things in this area in 3.6-rc1. 
> > I have expected all of those to actually be on theoretical problems not 
> > ever having happened in the wild, but it might be that you are actually 
> > chasing on of those.
> >
> > Could you please retest with latest Linus' tree (or at least eb055fd0560b) 
> > to see whether this hasn't actually been fixed already by Alan's series?
> 
> I've started trying that out, it seems Alan's work improved things.
> 
> For the first few attempts I have not seen SLAB corruptions, though after
> a few rounds I hit accumulation of the following messages:
> [  297.174828] hid-picolcd 0003:04D8:C002.0003: output queue full
> [  297.181098] hid-picolcd 0003:04D8:C002.0003: output queue full
> [  297.187820] hid-picolcd 0003:04D8:C002.0003: output queue full
> [  297.194087] hid-picolcd 0003:04D8:C002.0003: output queue full
> 
> with sporadically in between:
> [  292.668019] hid-picolcd 0003:04D8:C002.0003: usb_submit_urb(out) failed: -1
> 
> At first glance I think the queue filling up and never draining is caused
> by hid_hw_stop() stalling the queue and the time between both being just too
> short.

I don't really understand this explanation. Once usb_kill_urb() returns, 
the URB should be available for future use (and therefore all queues 
completely drained).

-- 
Jiri Kosina
SUSE Labs
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