Hello, again.
On 12/01/2010 01:44 PM, Kyle McMartin wrote:
> 00:1f.2 SATA controller [0106]: Intel Corporation 5 Series/3400 Series
...
> Model Number: HITACHI HTS725032A9A364
Nothing peculiar. Hmm... okay, I think I've found what went wrong.
Can you please try the following patch and see whether the problem
goes away?
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 5e59050..17a6378 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -3275,6 +3275,7 @@ static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
struct ata_port *ap = ata_is_host_link(link) ? link->ap : NULL;
struct ata_eh_context *ehc = &link->eh_context;
struct ata_device *dev, *link_dev = NULL, *lpm_dev = NULL;
+ enum ata_lpm_policy old_policy = link->lpm_policy;
unsigned int hints = ATA_LPM_EMPTY | ATA_LPM_HIPM;
unsigned int err_mask;
int rc;
@@ -3338,6 +3339,14 @@ static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
goto fail;
}
+ /*
+ * Low level driver acked the transition. Issue DIPM command
+ * with the new policy set.
+ */
+ link->lpm_policy = policy;
+ if (ap && ap->slave_link)
+ ap->slave_link->lpm_policy = policy;
+
/* host config updated, enable DIPM if transitioning to MIN_POWER */
ata_for_each_dev(dev, link, ENABLED) {
if (policy == ATA_LPM_MIN_POWER && ata_id_has_dipm(dev->id)) {
@@ -3353,12 +3362,14 @@ static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
}
}
- link->lpm_policy = policy;
- if (ap && ap->slave_link)
- ap->slave_link->lpm_policy = policy;
return 0;
fail:
+ /* restore the old policy */
+ link->lpm_policy = old_policy;
+ if (ap && ap->slave_link)
+ ap->slave_link->lpm_policy = old_policy;
+
/* if no device or only one more chance is left, disable LPM */
if (!dev || ehc->tries[dev->devno] <= 2) {
ata_link_printk(link, KERN_WARNING,
--
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