Hi all, I have some problems with printing via USB.
Whenever I cancel the transfer through a USB printer port (printer.o/usblp.o) this device (/dev/usb/lp0 in my case) gets locked. This behaviour is easily reproducable:
I send something to the printer, like # cat myfile.ps > /dev/usb/lp0
Then, the printer starts receiving data and starts printing. When I kill this cat process, the printer still prints what it has received so far, but does not switch back to online state (flashing LED indicates still receiving data). When I now cat something else to /dev/usb/lp0, this second cat process hangs,
i.e. it can't be killed (not even with kill -KILL), until I reconnect the USB cable or power off/on the printer. In this case lsusb shows me that /dev/usb/lp0 is now assigned to the next higher address number on the same bus, and things run as before.
I'm running Gentoo Linux and the printer is a HP LaserJet 2200DTN. It happens with both, the gentoo 2.4.25 and 2.6.5 kernels, with OHCI and UHCI host controlers, and with any types of spoolers/filters. It looks to me like a problem in printer.o/usblp.o , because the hanging cat process is obviously in kernel mode, waiting for the USB link to be reset.
So I would be very glad if someone had a workaround for that.
Best Roland
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