linux-kernel - Re: [BUG] Loading both ehci-hcd and uhci-hcd drivers causes my printer to fail

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Date:	Sat, 07 Mar 2009 22:22:07 +0200
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	Greg KH <greg@...ah.com>
Cc:	Alan Stern <stern@...land.harvard.edu>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] Loading both ehci-hcd and uhci-hcd drivers causes my
 printer to fail

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.



> 
> thanks,
> 
> greg k-h

View attachment "dmesg" of type "text/plain" (83679 bytes)