[net,v2,8/9] net: ethernet: mediatek: use devm_mdiobus_alloc instead of mdiobus_alloc inside mtk_mdio_init

Commit Message

Sean Wang Aug. 29, 2016, 5:03 a.m. UTC

From: Sean Wang <[e-mail]>

a lot of parts in the driver uses devm_* APIs to gain benefits from the
device resource management, so devm_mdiobus_alloc is also used instead
of mdiobus_alloc to have more elegant code flow.

Using common code provided by the devm_* helps to
1) have simplified the code flow as [1] says
2) decrease the risk of incorrect error handling by human
3) only a few drivers used it since it ware proposed on linux 3.16,
so just hope to promote for this.

Signed-off-by: Sean Wang <[e-mail]>

---
ref.
[1] https://patchwork.ozlabs.org/patch/344093/
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 23 ++++++-----------------
 1 file changed, 6 insertions(+), 17 deletions(-)

Comments

Andrew Lunn Aug. 29, 2016, 1:06 p.m. UTC | #1

On Mon, Aug 29, 2016 at 01:03:22PM +0800, [e-mail] wrote:
> From: Sean Wang <[e-mail]>
> 
> a lot of parts in the driver uses devm_* APIs to gain benefits from the
> device resource management, so devm_mdiobus_alloc is also used instead
> of mdiobus_alloc to have more elegant code flow.
> 
> Using common code provided by the devm_* helps to
> 1) have simplified the code flow as [1] says
> 2) decrease the risk of incorrect error handling by human
> 3) only a few drivers used it since it ware proposed on linux 3.16,
> so just hope to promote for this.
> 
> Signed-off-by: Sean Wang <[e-mail]>
> 
> ---
> ref.
> [1] https://patchwork.ozlabs.org/patch/344093/
> ---

Hi Sean

Your footnote is below the ---, so won't make it into the change log. 

Apart from that,

Reviewed-by: Andrew Lunn <[e-mail]>

    Andrew

Patch

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 85a527a..f741c6a 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -295,7 +295,7 @@  err_phy:
 static int mtk_mdio_init(struct mtk_eth *eth)
 {
 	struct device_node *mii_np;
-	int err;
+	int ret;
 
 	mii_np = of_get_child_by_name(eth->dev->of_node, "mdio-bus");
 	if (!mii_np) {
@@ -304,13 +304,13 @@  static int mtk_mdio_init(struct mtk_eth *eth)
 	}
 
 	if (!of_device_is_available(mii_np)) {
-		err = 0;
+		ret = 0;
 		goto err_put_node;
 	}
 
-	eth->mii_bus = mdiobus_alloc();
+	eth->mii_bus = devm_mdiobus_alloc(eth->dev);
 	if (!eth->mii_bus) {
-		err = -ENOMEM;
+		ret = -ENOMEM;
 		goto err_put_node;
 	}
 
@@ -321,20 +321,11 @@  static int mtk_mdio_init(struct mtk_eth *eth)
 	eth->mii_bus->parent = eth->dev;
 
 	snprintf(eth->mii_bus->id, MII_BUS_ID_SIZE, "%s", mii_np->name);
-	err = of_mdiobus_register(eth->mii_bus, mii_np);
-	if (err)
-		goto err_free_bus;
-	of_node_put(mii_np);
-
-	return 0;
-
-err_free_bus:
-	mdiobus_free(eth->mii_bus);
+	ret = of_mdiobus_register(eth->mii_bus, mii_np);
 
 err_put_node:
 	of_node_put(mii_np);
-	eth->mii_bus = NULL;
-	return err;
+	return ret;
 }
 
 static void mtk_mdio_cleanup(struct mtk_eth *eth)
@@ -343,8 +334,6 @@  static void mtk_mdio_cleanup(struct mtk_eth *eth)
 		return;
 
 	mdiobus_unregister(eth->mii_bus);
-	of_node_put(eth->mii_bus->dev.of_node);
-	mdiobus_free(eth->mii_bus);
 }
 
 static inline void mtk_irq_disable(struct mtk_eth *eth, u32 mask)