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libata: consider errors not associated with commands for speed down

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libata EH used to ignore errors not associated with commands when
determining whether speed down is necessary or not.  This leads to the
following problems.

* Errors not associated with commands can occur indefinitely without
  libata EH taking corrective actions.

* Upstream link errors don't trigger speed down when PMP is attached
  to it and commands issued to downstream device trigger errors on the
  upstream link.

This patch makes ata_eh_link_autopsy() consider errors not associated
with command for speed down.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-10-31 10:17:05 +09:00 committed by Jeff Garzik
parent 08cf69d005
commit dfcc173d71
1 changed files with 13 additions and 6 deletions
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19
drivers/ata/libata-eh.c
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@ -1747,6 +1747,7 @@ static void ata_eh_link_autopsy(struct ata_link *link)
{
struct ata_port *ap = link->ap;
struct ata_eh_context *ehc = &link->eh_context;
struct ata_device *dev;
unsigned int all_err_mask = 0;
int tag, is_io = 0;
u32 serror;
@ -1818,18 +1819,24 @@ static void ata_eh_link_autopsy(struct ata_link *link)
(!is_io && (all_err_mask & ~AC_ERR_DEV)))
ehc->i.action |= ATA_EH_REVALIDATE;
/* if we have offending qcs and the associated failed device */
/* If we have offending qcs and the associated failed device,
* perform per-dev EH action only on the offending device.
*/
if (ehc->i.dev) {
/* speed down */
ehc->i.action |= ata_eh_speed_down(ehc->i.dev, is_io,
all_err_mask);
/* perform per-dev EH action only on the offending device */
ehc->i.dev_action[ehc->i.dev->devno] |=
ehc->i.action & ATA_EH_PERDEV_MASK;
ehc->i.action &= ~ATA_EH_PERDEV_MASK;
}
/* consider speeding down */
dev = ehc->i.dev;
if (!dev && ata_link_max_devices(link) == 1 &&
ata_dev_enabled(link->device))
dev = link->device;
if (dev)
ehc->i.action |= ata_eh_speed_down(dev, is_io, all_err_mask);
DPRINTK("EXIT\n");
}