usb/112944: [patch] Bi-directional access to HP LaserJet 1010 printer on USB seems faulty

[Peter van Heusden &]

>Number:         112944
>Category:       usb
>Synopsis:       [patch] Bi-directional access to HP LaserJet 1010 printer on USB seems faulty
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-usb
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu May 24 14:40:02 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator:     Peter van Heusden &
>Release:        FreeBSD 6.2-STABLE i386
>Organization:
Webbed Feet
>Environment:
System: FreeBSD leftside.wfeet.za.net 6.2-STABLE FreeBSD 6.2-STABLE #5: Thu May 24 08:13:46 SAST 2007 pvh at leftside.wfeet.za.net:/usr/obj/usr/src/sys/LEFTSIDE i386


	FreeBSD 6-STABLE as of 23 May 2007
        Intel Celeron 768 MHz, 256 MB RAM
	USB:
	dmesg output:
uhci0: <VIA 83C572 USB controller> port 0xd400-0xd41f irq 11 at device 4.2 on pci0
uhci0: [GIANT-LOCKED]
usb0: <VIA 83C572 USB controller> on uhci0
usb0: USB revision 1.0
uhub0: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1: <VIA 83C572 USB controller> port 0xd000-0xd01f irq 11 at device 4.3 on pci0
uhci1: [GIANT-LOCKED]
usb1: <VIA 83C572 USB controller> on uhci1
usb1: USB revision 1.0
uhub1: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
...
ulpt0: Hewlett-Packard hp LaserJet 1010, rev 1.10/1.00, addr 2, iclass 7/1
ulpt0: using uni-directional mode

	usbdevs -v output:
addr 1: full speed, self powered, config 1, UHCI root hub(0x0000), VIA(0x0000), rev 1.00
 port 1 powered
 port 2 addr 2: full speed, self powered, config 1, hp LaserJet 1010(0x0c17), Hewlett-Packard(0x03f0), rev 1.00
Controller /dev/usb1:
addr 1: full speed, self powered, config 1, UHCI root hub(0x0000), VIA(0x0000), rev 1.00
 port 1 powered
 port 2 powered

>Description:
	CUPS on FreeBSD interacts badly with the HP LaserJet 1010 printer since
	it tries to read bytes from /dev/ulpt when select() claims they are
	available, yet hangs on read. Disabling bidirectional printing solves
	this problem. 
>How-To-Repeat:
	Try to read from /dev/ulpt0 when a HP LaserJet 1010 is attached.
>Fix:

	Patch attached.

>Release-Note:
>Audit-Trail:
>Unformatted: