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Subject[PATCH 4/7] fastboot: Make libata initialization even more async
From f29d3b23238e1955a8094e038c72546e99308e61 Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <arjan@linux.intel.com>
Date: Mon, 5 Jan 2009 15:07:07 -0800
Subject: [PATCH] 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>
---
drivers/ata/libata-core.c | 16 +++++++---------
1 files changed, 7 insertions(+), 9 deletions(-)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 7d3ae6a..f178a45 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;
}
--
1.6.0.6



--
Arjan van de Ven Intel Open Source Technology Centre
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