Check for errors and zero-length transfers in the ulpt_input() input pipe callback function, and just return if these cases are detected. Without these checks, the ulpt driver may cause an infinite loop of failing USB transfers that can hang the whole machine. This makes printing work for me on a HP DJ950C printer.
Check for errors and zero-length transfers in the ulpt_input() input
pipe callback function, and just return if these cases are detected.
Without these checks, the ulpt driver may cause an infinite loop
of failing USB transfers that can hang the whole machine. This makes
printing work for me on a HP DJ950C printer.

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