tree cbf21985f3894b11fe00666cef8ac33bae4f007d
parent 4dbfa39b6c95eb9d0aedb5bd00bb552b91c31e3d
author Tejun Heo <htejun@gmail.com> 1193304636 +0900
committer Jeff Garzik <jeff@garzik.org> 1193652925 -0400

libata: track SLEEP state and issue SRST to wake it up

ATA devices in SLEEP mode don't respond to any commands.  SRST is
necessary to wake it up.  Till now, when a command is issued to a
device in SLEEP mode, the command times out, which makes EH reset the
device and retry the command after that, causing a long delay.

This patch makes libata track SLEEP state and issue SRST automatically
if a command is about to be issued to a device in SLEEP.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Bruce Allen <ballen@gravity.phys.uwm.edu>
Cc: Andrew Paprocki <andrew@ishiboo.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>