>From 68db7c1eff38c2e121ccc922fd365f4f086369dc Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Date: Sat, 10 Jan 2009 10:18:44 -0800
Subject: [PATCH] libata: only ports >= 0 need to synchronize
In a discussio with Jeff Garzik, he mentioned that the serialization
for the libata port probes only needs to be within the domain of a host.
This means that for the first port of each host (with ID 0), we don't
need to wait, so we can relax our serialization a little.
Signed-off-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
---
drivers/ata/libata-core.c | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 31c0f22..71218d7 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5925,10 +5925,12 @@ static void async_port_probe(void *data, async_cookie_t cookie)
* If we're not allowed to scan this host in parallel,
* we need to wait until all previous scans have completed
* before going further.
+ * Jeff Garzik says this is only within a controller, so we
+ * don't need to wait for port 0, only for later ports.
*/
- if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN))
+ if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
async_synchronize_cookie(cookie);
-
+
/* probe */
if (ap->ops->error_handler) {
struct ata_eh_info *ehi = &ap->link.eh_info;
--
1.6.0.6
--
Arjan van de Ven Intel Open Source Technology Centre
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