OK, I've found out where the backend hangs. It enters an infinite
loop in "measure_transfer_rate". When tested with res=100, x=55, it
tries to read 31104 bytes (in 48 lines of 648 bytes), but only ever
gets 29808 bytes.
It loops forever waiting to get the last 1296 bytes (two lines), which
The 31104 that it expects comes from "pss->read_bytes", which (I
guess) should be filled with the actual number of bytes available by
the earlier call to "scsi_read (pss, READ_TRANSTIME)".
Anyway, changing to line
if (status != SANE_STATUS_GOOD)
if (status != SANE_STATUS_GOOD || ndata == 0)
fixed the problem. I suspect there should be a cleaner fix, since I
don't really know what I am doing.
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