net/macb: make clk_enable atomic

Use clk_prepare_enable/clk_disable_unprepare to be safe on SMP systems.
Signed-off-by: NSteffen Trumtrar <s.trumtrar@pengutronix.de>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Fabio Estevam <festevam@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/cadence/macb.c

@@ -1561,14 +1561,14 @@ static int __init macb_probe(struct platform_device *pdev)
 		dev_err(&pdev->dev, "failed to get macb_clk\n");
 		goto err_out_free_dev;
 	}
-	clk_enable(bp->pclk);
+	clk_prepare_enable(bp->pclk);
 
 	bp->hclk = clk_get(&pdev->dev, "hclk");
 	if (IS_ERR(bp->hclk)) {
 		dev_err(&pdev->dev, "failed to get hclk\n");
 		goto err_out_put_pclk;
 	}
-	clk_enable(bp->hclk);
+	clk_prepare_enable(bp->hclk);
 
 	bp->regs = ioremap(regs->start, resource_size(regs));
 	if (!bp->regs) {
@@ -1658,9 +1658,9 @@ static int __init macb_probe(struct platform_device *pdev)
 err_out_iounmap:
 	iounmap(bp->regs);
 err_out_disable_clocks:
-	clk_disable(bp->hclk);
+	clk_disable_unprepare(bp->hclk);
 	clk_put(bp->hclk);
-	clk_disable(bp->pclk);
+	clk_disable_unprepare(bp->pclk);
 err_out_put_pclk:
 	clk_put(bp->pclk);
 err_out_free_dev:
@@ -1687,9 +1687,9 @@ static int __exit macb_remove(struct platform_device *pdev)
 		unregister_netdev(dev);
 		free_irq(dev->irq, dev);
 		iounmap(bp->regs);
-		clk_disable(bp->hclk);
+		clk_disable_unprepare(bp->hclk);
 		clk_put(bp->hclk);
-		clk_disable(bp->pclk);
+		clk_disable_unprepare(bp->pclk);
 		clk_put(bp->pclk);
 		free_netdev(dev);
 		platform_set_drvdata(pdev, NULL);
@@ -1707,8 +1707,8 @@ static int macb_suspend(struct platform_device *pdev, pm_message_t state)
 	netif_carrier_off(netdev);
 	netif_device_detach(netdev);
 
-	clk_disable(bp->hclk);
-	clk_disable(bp->pclk);
+	clk_disable_unprepare(bp->hclk);
+	clk_disable_unprepare(bp->pclk);
 
 	return 0;
 }
@@ -1718,8 +1718,8 @@ static int macb_resume(struct platform_device *pdev)
 	struct net_device *netdev = platform_get_drvdata(pdev);
 	struct macb *bp = netdev_priv(netdev);
 
-	clk_enable(bp->pclk);
-	clk_enable(bp->hclk);
+	clk_prepare_enable(bp->pclk);
+	clk_prepare_enable(bp->hclk);
 
 	netif_device_attach(netdev);