libata: implement ATA_DFLAG_DUBIOUS_XFER
ATA_DFLAG_DUBIOUS_XFER is set whenever data transfer speed or method changes and gets cleared when data transfer command succeeds in the newly configured transfer mode. This will be used to improve speed down logic. Signed-off-by: Tejun Heo <htejun@gmail.com<> Signed-off-by: Jeff Garzik <jeff@garzik.org>
parent
663f99b8
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