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authorTejun Heo <htejun@gmail.com>2007-10-31 10:17:05 +0900
committerJeff Garzik <jeff@garzik.org>2007-11-03 08:47:26 -0400
commitdfcc173d71b029eb2b10cf99bb5b4e8749e09799 (patch)
treef8b62dc076a082560ffcf94f6f330150766c7ee7 /drivers/ata
parent08cf69d005acda706bc014c61301993758ce9c5f (diff)
downloadop-kernel-dev-dfcc173d71b029eb2b10cf99bb5b4e8749e09799.zip
op-kernel-dev-dfcc173d71b029eb2b10cf99bb5b4e8749e09799.tar.gz
libata: consider errors not associated with commands for speed down
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>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/libata-eh.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 7a2e54e..ed8813b 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -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");
}
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