openwrt/target/linux/brcm2708/patches-3.18/0107-i2c_bcm2708-Fix-clock-reference-counting.patch

From cf1b789e1a6873d9680156fac9f675a0f1cdd17b Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Thu, 5 Feb 2015 16:01:44 +0000
Subject: [PATCH 107/114] i2c_bcm2708: Fix clock reference counting

---
 drivers/i2c/busses/i2c-bcm2708.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

--- a/drivers/i2c/busses/i2c-bcm2708.c
+++ b/drivers/i2c/busses/i2c-bcm2708.c
@@ -337,11 +337,17 @@ static int bcm2708_i2c_probe(struct plat
 		return PTR_ERR(clk);
 	}
 
+	err = clk_prepare_enable(clk);
+	if (err) {
+		dev_err(&pdev->dev, "could not enable clk: %d\n", err);
+		goto out_clk_put;
+	}
+
 	bcm2708_i2c_init_pinmode(pdev->id);
 
 	bi = kzalloc(sizeof(*bi), GFP_KERNEL);
 	if (!bi)
-		goto out_clk_put;
+		goto out_clk_disable;
 
 	platform_set_drvdata(pdev, bi);
 
@@ -412,6 +418,8 @@ out_iounmap:
 	iounmap(bi->base);
 out_free_bi:
 	kfree(bi);
+out_clk_disable:
+	clk_disable_unprepare(clk);
 out_clk_put:
 	clk_put(clk);
 	return err;
@@ -426,7 +434,7 @@ static int bcm2708_i2c_remove(struct pla
 	i2c_del_adapter(&bi->adapter);
 	free_irq(bi->irq, bi);
 	iounmap(bi->base);
-	clk_disable(bi->clk);
+	clk_disable_unprepare(bi->clk);
 	clk_put(bi->clk);
 	kfree(bi);