libata: don't whine if ->prereset() returns -ENOENT

->prereset() returns -ENOENT to tell libata that the port is empty and
reset sequencing should be stopped.  This is not an error condition.
Update ata_eh_reset() such that it sets device classes to ATA_DEV_NONE
and return success in on -ENOENT.  This makes spurious error message
go away.

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

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 7349c3dbf774..361953a50203 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -1625,8 +1625,14 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
                 rc = prereset(ap);
                 if (rc) {
                         if (rc == -ENOENT) {
-                                ata_port_printk(ap, KERN_DEBUG, "port disabled. ignoring.\n");
+                                ata_port_printk(ap, KERN_DEBUG,
+                                                "port disabled. ignoring.\n");
                                 ap->eh_context.i.action &= ~ATA_EH_RESET_MASK;
+
+                                for (i = 0; i < ATA_MAX_DEVICES; i++)
+                                        classes[i] = ATA_DEV_NONE;
+
+                                rc = 0;
                         } else
                                 ata_port_printk(ap, KERN_ERR,
                                         "prereset failed (errno=%d)\n", rc);