libata: set device class to NONE if phys_offline

Reset methods don't have access to phys link status for slave links
and may incorrectly indicate device presence causing unnecessary probe
failures for unoccupied links.  This patch clears device class to NONE
during post-reset processing if phys link is offline.

As on/offlineness semantics is strictly defined and used in multiple
places by the core layer, this won't change behavior for drivers which
don't use slave links.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 7ccd0ce0e7d4bf5db8afe9512d55ca5622af1e0e..5d687d7cffaea9a3e50d28eae19e9cffdb08c975 100644 (file)
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2455,14 +2455,14 @@ int ata_eh_reset(struct ata_link *link, int classify,
                dev->pio_mode = XFER_PIO_0;
                dev->flags &= ~ATA_DFLAG_SLEEPING;
 
-               if (ata_phys_link_offline(ata_dev_phys_link(dev)))
-                       continue;
-
-               /* apply class override */
-               if (lflags & ATA_LFLAG_ASSUME_ATA)
-                       classes[dev->devno] = ATA_DEV_ATA;
-               else if (lflags & ATA_LFLAG_ASSUME_SEMB)
-                       classes[dev->devno] = ATA_DEV_SEMB_UNSUP; /* not yet */
+               if (!ata_phys_link_offline(ata_dev_phys_link(dev))) {
+                       /* apply class override */
+                       if (lflags & ATA_LFLAG_ASSUME_ATA)
+                               classes[dev->devno] = ATA_DEV_ATA;
+                       else if (lflags & ATA_LFLAG_ASSUME_SEMB)
+                               classes[dev->devno] = ATA_DEV_SEMB_UNSUP;
+               } else
+                       classes[dev->devno] = ATA_DEV_NONE;
        }
 
        /* record current link speed */