PROBLEM:  (BCSM90G7C, NONE) (PATCH ID: OSF505-059)
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This patch fixes a  hang in the shutdown process ("shutdown now") of a system
when a device has flow control switched off.  The shutdown waits for the flow
control device to become available for write(2).

The patch will open the device in write with non-blocking mode which will
prevent hanging of the shutdown process.