From: Arjan van de Ven Date: Sat, 10 Jan 2009 18:18:44 +0000 (-0800) Subject: libata: only ports >= 0 need to synchronize X-Git-Tag: upstream/snapshot3+hdmi~20590 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fa853a48413c2ca1a5dc6b539bf07cf8e7247f8e;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git 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 Signed-off-by: Linus Torvalds --- diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index f810078..71218d7 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 */