linux-kernel - [PATCH 1/2] phy: miphy28lp: Avoid calling of_get_child

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Date:	Tue, 24 Feb 2015 19:52:47 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	Gabriel FERNANDEZ <gabriel.fernandez@...com>,
	Lee Jones <lee.jones@...aro.org>,
	Alexandre Torgue <alexandre.torgue@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] phy: miphy28lp: Avoid calling of_get_child_count()
 multiple times

Currently, of_get_child_count() is called in each iteration of the for loop in
miphy28lp_xlate(). This patch stores the return value of of_get_child_count()
in miphy_dev->nphys and call of_get_child_count() once in miphy28lp_probe().

Signed-off-by: Axel Lin <axel.lin@...ics.com>
---
 drivers/phy/phy-miphy28lp.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/phy/phy-miphy28lp.c b/drivers/phy/phy-miphy28lp.c
index 9b2848e..d444932 100644
--- a/drivers/phy/phy-miphy28lp.c
+++ b/drivers/phy/phy-miphy28lp.c
@@ -228,6 +228,7 @@ struct miphy28lp_dev {
 	struct regmap *regmap;
 	struct mutex miphy_mutex;
 	struct miphy28lp_phy **phys;
+	int nphys;
 };
 
 struct miphy_initval {
@@ -1116,7 +1117,7 @@ static struct phy *miphy28lp_xlate(struct device *dev,
 		return ERR_PTR(-EINVAL);
 	}
 
-	for (index = 0; index < of_get_child_count(dev->of_node); index++)
+	for (index = 0; index < miphy_dev->nphys; index++)
 		if (phynode == miphy_dev->phys[index]->phy->dev.of_node) {
 			miphy_phy = miphy_dev->phys[index];
 			break;
@@ -1200,15 +1201,15 @@ static int miphy28lp_probe(struct platform_device *pdev)
 	struct miphy28lp_dev *miphy_dev;
 	struct phy_provider *provider;
 	struct phy *phy;
-	int chancount, port = 0;
-	int ret;
+	int ret, port = 0;
 
 	miphy_dev = devm_kzalloc(&pdev->dev, sizeof(*miphy_dev), GFP_KERNEL);
 	if (!miphy_dev)
 		return -ENOMEM;
 
-	chancount = of_get_child_count(np);
-	miphy_dev->phys = devm_kzalloc(&pdev->dev, sizeof(phy) * chancount,
+	miphy_dev->nphys = of_get_child_count(np);
+	miphy_dev->phys = devm_kzalloc(&pdev->dev,
+				       sizeof(phy) * miphy_dev->nphys,
 				       GFP_KERNEL);
 	if (!miphy_dev->phys)
 		return -ENOMEM;
-- 
1.9.1



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