RFR: DIO-20 SPI: it is impossible to use external device

[Sergey Nazarkin]

Looks good to me

Sergey Nazarkin




> On 23 Mar 2016, at 20:10, boris kvartskhava <boris.kvartskhava at oracle.com> wrote:
> 
> issue: https://bugs.openjdk.java.net/browse/DIO-20
> webrev: http://cr.openjdk.java.net/~onazarkina/DIO-20/
> 
> This change makes it possible to successfully perform expected I/O operation
> with  jdk.dio.spibus.SPIDevice and jdk.dio.spibus.SPICompositeMessage.
> A testing of previous change  was done on the implementation
> that allowed repeated endTransaction() calls, as a result,
> all SPIDevice.write/read/writeAndRead and SPICompositeMessage.transfer()
> were throwing ISE.