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authorArjan van de Ven <arjan@linux.intel.com>2009-01-10 10:18:44 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-10 15:06:52 -0800
commitfa853a48413c2ca1a5dc6b539bf07cf8e7247f8e (patch)
tree043212be5120dd4e422b0a04fd33900258b8108d
parent886ad09fc83342aa1c5a02a0b6d3298b78a8067f (diff)
downloadconfigs-fa853a48413c2ca1a5dc6b539bf07cf8e7247f8e.tar.gz
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@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/ata/libata-core.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index f810078fafc..71218d76d75 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5925,8 +5925,10 @@ 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 */