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

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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>
This commit is contained in:
Tejun Heo
2007-10-25 18:30:36 +09:00
committed by Jeff Garzik
parent 4dbfa39b6c
commit 054a5fbace
4 changed files with 17 additions and 1 deletions
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4
drivers/ata/libata-eh.c
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@@ -2208,9 +2208,11 @@ int ata_eh_reset(struct ata_link *link, int classify,
ata_link_for_each_dev(dev, link) {
/* After the reset, the device state is PIO 0
* and the controller state is undefined.
* Record the mode.
* Reset also wakes up drives from sleeping
* mode.
*/
dev->pio_mode = XFER_PIO_0;
dev->flags &= ~ATA_DFLAG_SLEEPING;
if (ata_link_offline(link))
continue;