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

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Date:	Thu, 16 Aug 2012 18:47:04 +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 Thu, 16 Aug 2012, Bruno Prémont wrote:

> > 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).
> 
> I won't have time today to check, though my guess is that on each
> echo $usb-id > bind; echo $usb-id > unbind
> under /sys/bus/hid/drivers/hid-picolcd/ the USB urb queue fills a bit does
> not get cleared.
> 
> Is usb_kill_urb() called when unbinding just the specific hid driver? 

Yup, through hid_hw_stop() -> usbhid_stop().

> If so my short timing between bind/unbind must be triggering something 
> else...
> 
> Otherwise I'm missing something as at first time I got no "output queue full"
> messages, but as I repeated the bind/unbind sequences the prints per bind/unbind
> iteration increased in number.
> 
> Anyhow, on Friday evening/week-end I will continue digging and report back with my
> findings.

Thank you, Bruno.

-- 
Jiri Kosina
SUSE Labs
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