Here's an updated version of the printer patch I sent by earlier this week.
- semaphore guards chardev access to USB device (from earlier)
- adds omitted "return retval" in modified usblp_ioctl()
- fixes "unplug while open" cleanup in usblp_release()
- removes devfs-related noise, bug-in-comment
Again, while I can't test this, it "ought to" fix an oops-on-unplug that
has been variously reported for most of this year.
Please test.
- Dave
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