ide: filter out invalid transfer mode values in set_xfer_rate()
Filter out invalid transfer mode values (0x02-0x07) in write handler for obsoleted /proc/ide/hd?/settings:current_speed setting. While at it: * Use XFER_UDMA_6 define. Suggested-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
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