libata: unify mechanism to request follow-up SRST

Previously, there were two ways to trigger follow-up SRST from
hardreset method - returning -EAGAIN and leaving all device classes
unmodified.  Drivers never used the latter mechanism and the only use
case for the former was when hardreset couldn't classify.

Drop the latter mechanism and let -EAGAIN mean "perform follow-up SRST
if classification is required".  This change removes unnecessary
follow-up SRSTs and simplifies reset implementations.

Signed-off-by: Tejun Heo <htejun@gmail.com>

1 files changed, 8 insertions, 18 deletions

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index d8c4a45dcf26..4ec1397434c0 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2055,20 +2055,10 @@ static int ata_do_reset(struct ata_link *link, ata_reset_fn_t reset,
         if (rc)
                 return rc;
 
-        /* If any class isn't ATA_DEV_UNKNOWN, consider classification
-         * is complete and convert all ATA_DEV_UNKNOWN to
-         * ATA_DEV_NONE.
-         */
+        /* convert all ATA_DEV_UNKNOWN to ATA_DEV_NONE */
         ata_link_for_each_dev(dev, link)
-                if (classes[dev->devno] != ATA_DEV_UNKNOWN)
-                        break;
-
-        if (dev) {
-                ata_link_for_each_dev(dev, link) {
-                        if (classes[dev->devno] == ATA_DEV_UNKNOWN)
-                                classes[dev->devno] = ATA_DEV_NONE;
-                }
-        }
+                if (classes[dev->devno] == ATA_DEV_UNKNOWN)
+                        classes[dev->devno] = ATA_DEV_NONE;
 
         return 0;
 }
@@ -2079,15 +2069,15 @@ static int ata_eh_followup_srst_needed(struct ata_link *link,
 {
         if (link->flags & ATA_LFLAG_NO_SRST)
                 return 0;
-        if (rc == -EAGAIN)
-                return 1;
+        if (rc == -EAGAIN) {
+                if (classify)
+                        return 1;
+                rc = 0;
+        }
         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;
         return 0;
 }