sc_data_direction and bidi commands

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Hello,

Although several SCSI LLDs compare sc_data_direction with the value
DMA_BIDIRECTIONAL apparently scsi_setup_cmnd() never sets
sc_data_direction to the value DMA_BIDIRECTIONAL. Is this behavior on
purpose ? I discovered this while debugging bidi support in a SCSI LLD.

Thanks,

Bart.
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