libata-pmp: update ata_eh_reset() for PMP

PMP always requires SRST to be enabled.  Also, hardreset reports
classification code from the first device when PMP is attached, not
from the PMP.  Update ata_eh_reset() such that followup softreset is
performed if the controller is PMP capable and the host link is being
reset.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 60186f8ac3a..687419b6670 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2003,6 +2003,8 @@ static int ata_eh_followup_srst_needed(struct ata_link *link,
                 return 1;
         if (rc != 0)
                 return 0;
+        if ((link->ap->flags & ATA_FLAG_PMP) && ata_is_host_link(link))
+                return 1;
         if (classify && !(link->flags & ATA_LFLAG_ASSUME_CLASS) &&
             classes[0] == ATA_DEV_UNKNOWN)
                 return 1;