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Subject: Re: [BUG] Loading both ehci-hcd and uhci-hcd drivers causes my
 printer to fail
From: Maxim Levitsky <maximlevitsky@gmail.com>
To: Greg KH <greg@kroah.com>
Cc: Alan Stern <stern@rowland.harvard.edu>, linux-usb@vger.kernel.org,
       linux-kernel@vger.kernel.org
In-Reply-To: <1236457327.6077.83.camel@maxim-laptop>
References: <1236453644.6077.68.camel@maxim-laptop>
	 <20090307195225.GA2585@kroah.com>  <1236457327.6077.83.camel@maxim-laptop>
Content-Type: text/plain
Date: Sun, 08 Mar 2009 02:55:57 +0200
Message-Id: <1236473757.12970.0.camel@maxim-laptop>
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On Sat, 2009-03-07 at 22:22 +0200, Maxim Levitsky wrote:
> On Sat, 2009-03-07 at 11:52 -0800, Greg KH wrote:
> > On Sat, Mar 07, 2009 at 09:20:44PM +0200, Maxim Levitsky wrote:
> > > Hi,
> > > 
> > > Short summary:
> > > 
> > > I have HP1018 printer, and it works well in windows.
> > > When I use in in linux, I often see messages like:
> > > 
> > > usbfs: USBDEVFS_CONTROL failed cmd python rqt 128 rq 6 len 255 ret -110
> > > 
> > > This is using hp backend that talks to printer using usbfs.
> > > I also tried usblp, but it just doesn't say anything in kernel log. I
> > > think it silently ignores similar errors, because the end result is the
> > > same, the printer sometimes works, but sometimes doesn't.
> > > (printer needs firmware to be uploaded to it, and I do upload it).
> > > 
> > > On the other hand, IF I remove _ether_ ehci-hcd or uhci-hcd from kernel,
> > > then everything works fine, I already rebooted the printer many times,
> > > used it to print, upload firmware, and everything just work, but as soon
> > > as I load the second driver it fails in same way again.
> > > 
> > > USB issues with this class of printers are nothing but new, for example
> > > see:
> > > 
> > > http://foo2zjs.rkkda.com/forum/read.php?9,374
> > > https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.15/+bug/54419
> > 
> > What kernel version are you using?
> > 
> > > I compiled without CONFIG_USB_EHCI_ROOT_HUB_TT
> > > and it did help (didn't that much testing, but at least firmware loads
> > > ok, and no error messages)
> > 
> > Can you provide the full kernel log messages from when you plug in your
> > printer?  Are there any other messages saying that you need to be sure
> > to load one driver before the other?
> I am familiar with these messages, maybe instead uhci should depend on
> ehci or something like that?
> 
> Tommorow I try to load them manually in correct order.
> Btw, if I unload both and then load first ehci then uhci, this is ok
> (if they were loaded incorrectly)
> 
> 
> Confirm again that without CONFIG_USB_EHCI_ROOT_HUB_TT both drivers
> work.
> 
> dmesg (from /var/log/kern.log.0) attached
> It shows how I rebooted the printer often.
> It also have this error message about the order.
> 
> But this isn't related.
> I currently blacklisted uhci-hcd, so only ehci-hcd gets loaded.
> Then I loaded the uhci, and got same bug
> (This is why I attached an older dmesg, if you need I reproduce that bug
> again)
> 
> 
> To be clear, usually after these error messages (... -110), printer
> stops working, it is so confused, all attempts to access it hang.
> Only reboot helps.

And of course, forgot, kernel is vanilla 2.6.28
with compat-wireless patches.

Best regards,
	Maxim Levitsky

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