staging: comedi: don't allow write() on async command set up for "read"
If a Comedi asynchronous command has been set up for data transfer in the "read" direction on the current "write" subdevice (for those subdevices that support both directions), don't allow the "write" file operation as that would mess with the data in the comedi data buffer that is written by the low-level comedi hardware driver. Signed-off-by: NIan Abbott <abbotti@mev.co.uk> Reviewed-by: NH Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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