[PATCH net-next v2 02/10] net: ethernet: Convert using devm_clk_get_enabled() in emac_probe()

[Li Zetao]

Use devm_clk_get_enabled() instead of devm_clk_get() +
clk_prepare_enable(), which can make the clk consistent with the device
life cycle and reduce the risk of unreleased clk resources. Since the
device framework has automatically released the clk resource, there is
no need to execute clk_disable_unprepare(clk) on the error path, drop
the out_clk_disable_unprepare label, and the original error process can
changed to the out_dispose_mapping error path.

Signed-off-by: Li Zetao <lizetao1 at huawei.com>
---
 drivers/net/ethernet/allwinner/sun4i-emac.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
index d761c08fe5c1..8f42501729b7 100644
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
@@ -1005,22 +1005,16 @@ static int emac_probe(struct platform_device *pdev)
 	if (emac_configure_dma(db))
 		netdev_info(ndev, "configure dma failed. disable dma.\n");
 
-	db->clk = devm_clk_get(&pdev->dev, NULL);
+	db->clk = devm_clk_get_enabled(&pdev->dev, NULL);
 	if (IS_ERR(db->clk)) {
 		ret = PTR_ERR(db->clk);
 		goto out_dispose_mapping;
 	}
 
-	ret = clk_prepare_enable(db->clk);
-	if (ret) {
-		dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", ret);
-		goto out_dispose_mapping;
-	}
-
 	ret = sunxi_sram_claim(&pdev->dev);
 	if (ret) {
 		dev_err(&pdev->dev, "Error couldn't map SRAM to device\n");
-		goto out_clk_disable_unprepare;
+		goto out_dispose_mapping;
 	}
 
 	db->phy_node = of_parse_phandle(np, "phy-handle", 0);
@@ -1068,8 +1062,6 @@ static int emac_probe(struct platform_device *pdev)
 
 out_release_sram:
 	sunxi_sram_release(&pdev->dev);
-out_clk_disable_unprepare:
-	clk_disable_unprepare(db->clk);
 out_dispose_mapping:
 	irq_dispose_mapping(ndev->irq);
 	dma_release_channel(db->rx_chan);
@@ -1095,7 +1087,6 @@ static void emac_remove(struct platform_device *pdev)
 
 	unregister_netdev(ndev);
 	sunxi_sram_release(&pdev->dev);
-	clk_disable_unprepare(db->clk);
 	irq_dispose_mapping(ndev->irq);
 	iounmap(db->membase);
 	free_netdev(ndev);
-- 
2.34.1