Re: USB scanner issue (Was: Re: Beaver in Detox!)

From: Tom Rini <trini@kernel.crashing.org>
To: Greg KH <greg@kroah.com>
Cc: Linus Torvalds <torvalds@osdl.org>,
	henning@meier-geinitz.de,
	Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-usb-users@lists.sourceforge.net
Subject: Re: USB scanner issue (Was: Re: Beaver in Detox!)
Date: Mon, 1 Dec 2003 13:52:16 -0700	[thread overview]
Message-ID: <20031201205216.GA4307@stop.crashing.org> (raw)
In-Reply-To: <20031201192158.GC23209@kroah.com>

On Mon, Dec 01, 2003 at 11:21:58AM -0800, Greg KH wrote:
> On Fri, Nov 28, 2003 at 11:26:25AM -0700, Tom Rini wrote:
> > On Wed, Nov 26, 2003 at 12:55:00PM -0800, Linus Torvalds wrote:
> > 
> > [snip]
> > > I give you "Beaver in Detox", aka linux-2.6.0-test11. This is mainly
> > > brought on by the fact that the old aic7xxx driver was broken in -test10,
> > > and Ingo found this really evil test program that showed an error case in
> > > do_fork() that we had never handled right. Well, duh!
> > 
> > I've found an odd problem that's in at least 2.6.0-test11.  I've
> > reproduced this twice now with an Epson 1240 USB scanner
> > (0x04b8/0x010b).  What happens is if I run xsane from gimp, acquire a
> > preview, start to scan and then cancel, the scanner becomes
> > unresponsive.  If I try and quit xsane, it gets stuck.  Unplugging /
> > replugging and then trying to kill xsane locked the machine up hard.
> > 
> > Here's ver_linux, dmesg and the versions of gimp/xsane I'm running (I've
> > used the scanner during this boot, without trying to lock it up):
> 
> Can't you use xsane without the scanner kernel driver?  I thought the
> latest versions used libusb/usbfs to talk directly to the hardware.
> Because of this, the USB scanner driver is marked to be removed from the
> kernel sometime in the near future.

After a bit of mucking around (and possibly finding a bug with debian's
libusb/xsane/hotplug interaction, nothing seems to run
/etc/hotplug/usb/libusbscanner and thus only root can scan, anyone whose
got this working please let me know), the problem does not exist if I
only use  libusb xsane.

How about the following:
===== drivers/usb/image/Kconfig 1.5 vs edited =====

--- 1.5/drivers/usb/image/Kconfig	Thu Sep 25 11:22:48 2003
+++ edited/drivers/usb/image/Kconfig	Mon Dec  1 13:51:48 2003
@@ -18,12 +18,14 @@
 	  module will be called mdc800.
 
 config USB_SCANNER
-	tristate "USB Scanner support"
+	tristate "USB Scanner support (OBSOLETE)"
 	depends on USB
 	help
 	  Say Y here if you want to connect a USB scanner to your computer's
 	  USB port. Please read <file:Documentation/usb/scanner.txt> for more
 	  information.
+
+	  This driver has been obsoleted by support via libusb.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called scanner.

-- 
Tom Rini
http://gate.crashing.org/~trini/
