linux-kernel - [PATCH] sata_mv: Manage SATA port multiplier while searching for active links

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Date:	Mon, 30 Mar 2015 19:32:45 +0200
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>
Subject: [PATCH] sata_mv: Manage SATA port multiplier while searching for active links

From: Nadav Haklai <nadavh@...vell.com>

With this patch, when searching for active link, first search through
the port multiplier links. And then fall to the default ap active_tag
only if no there is no active link in the port multiplier.

[gregory.clement@...e-electrons.com: reword commit log and title]

Signed-off-by: Lior Amsalem <alior@...vell.com>
Reviewed-by: Nadav Haklai <nadavh@...vell.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
---
 drivers/ata/sata_mv.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index f8c33e3772b8..7fac4d0fee86 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -2423,10 +2423,19 @@ static struct ata_queued_cmd *mv_get_active_qc(struct ata_port *ap)
 {
 	struct mv_port_priv *pp = ap->private_data;
 	struct ata_queued_cmd *qc;
+	struct ata_link *link = NULL;
 
 	if (pp->pp_flags & MV_PP_FLAG_NCQ_EN)
 		return NULL;
-	qc = ata_qc_from_tag(ap, ap->link.active_tag);
+
+	ata_for_each_link(link, ap, EDGE)
+		if (ata_link_active(link))
+			break;
+
+	if (!link)
+		link = &ap->link;
+
+	qc = ata_qc_from_tag(ap, link->active_tag);
 	if (qc && !(qc->tf.flags & ATA_TFLAG_POLLING))
 		return qc;
 	return NULL;
-- 
2.1.0

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