[Xenomai-core] Important fix for 16550A driver

[Xenomai-core] Important fix for 16550A driver

[Jan Kiszka]

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Hi,

all users of the xeno_16550A driver: I found an awkward bug in the
driver's interrupt handling which could cause deadlocks in that routine
- and lock-up your machine. This is fixed now both in trunk and the
2.1.x-branch (driver version 1.3.1).

The new version also contains a useful new IOCTL to purge the input and
output queues (generic RTIOC_PURGE, update of the serial profile is yet
pending). Specifically, if you have babbling serial devices which cannot
be stopped (like we here...), this helps to flush the queues and error
states in order to start over with synchronising on the stream.

Jan


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