[PATCH] libata: make ata_set_mode() handle no-device case properly
Make ata_set_mode() return without doing anything if there is no device on the port. This is in preparation for ata_bus_probe() changes. Signed-off-by: NTejun Heo <htejun@gmail.com> Signed-off-by: NJeff Garzik <jeff@garzik.org>
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