fastboot: Make libata initialization even more async

As suggested by Linus: Don't do the libata init in 2 separate
steps with a global sync inbetween, but do it as one async step,
with a local sync before registering the device.

This cuts the boottime on my machine with 2 sata controllers down
significantly, and it seems to work. Would be nice if the libata
folks take a good look at this patch though..

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>

1 files changed, 7 insertions, 9 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 7d3ae6a6fce7..f178a450ec08 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5951,6 +5951,12 @@ static void async_port_probe(void *data, async_cookie_t cookie)
                          */
                 }
         }
+
+        /* in order to keep device order, we need to synchronize at this point */
+        async_synchronize_cookie(cookie);
+
+        ata_scsi_scan_host(ap, 1);
+
 }
 /**
  *      ata_host_register - register initialized ATA host
@@ -6033,15 +6039,7 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
                 struct ata_port *ap = host->ports[i];
                 async_schedule(async_port_probe, ap);
         }
-        async_synchronize_full();
-        /* probes are done, now scan each port's disk(s) */
-        DPRINTK("host probe begin\n");
-        for (i = 0; i < host->n_ports; i++) {
-                struct ata_port *ap = host->ports[i];
-
-                ata_scsi_scan_host(ap, 1);
-        }
-        DPRINTK("host probe end\n");
+        DPRINTK("probe end\n");
 
         return 0;
 }