Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm

* 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm: (291 commits)
  ARM: AMBA: Add pclk support to AMBA bus infrastructure
  ARM: 6278/2: fix regression in RealView after the introduction of pclk
  ARM: 6277/1: mach-shmobile: Allow users to select HZ, default to 128
  ARM: 6276/1: mach-shmobile: remove duplicate NR_IRQS_LEGACY
  ARM: 6246/1: mmci: support larger MMCIDATALENGTH register
  ARM: 6245/1: mmci: enable hardware flow control on Ux500 variants
  ARM: 6244/1: mmci: add variant data and default MCICLOCK support
  ARM: 6243/1: mmci: pass power_mode to the translate_vdd callback
  ARM: 6274/1: add global control registers definition header file for nuc900
  mx2_camera: fix type of dma buffer virtual address pointer
  mx2_camera: Add soc_camera support for i.MX25/i.MX27
  arm/imx/gpio: add spinlock protection
  ARM: Add support for the LPC32XX arch
  ARM: LPC32XX: Arch config menu supoport and makefiles
  ARM: LPC32XX: Phytec 3250 platform support
  ARM: LPC32XX: Misc support functions
  ARM: LPC32XX: Serial support code
  ARM: LPC32XX: System suspend support
  ARM: LPC32XX: GPIO, timer, and IRQ drivers
  ARM: LPC32XX: Clock driver
  ...

1 files changed, 25 insertions, 12 deletions

diff --git a/arch/arm/plat-mxc/clock.c b/arch/arm/plat-mxc/clock.c
index 323ff8ccc877..2ed3ab173add 100644
--- a/arch/arm/plat-mxc/clock.c
+++ b/arch/arm/plat-mxc/clock.c
@@ -52,13 +52,14 @@ static void __clk_disable(struct clk *clk)
 {
 	if (clk == NULL || IS_ERR(clk))
 		return;
-
-	__clk_disable(clk->parent);
-	__clk_disable(clk->secondary);
-
 	WARN_ON(!clk->usecount);
-	if (!(--clk->usecount) && clk->disable)
-		clk->disable(clk);
+
+	if (!(--clk->usecount)) {
+		if (clk->disable)
+			clk->disable(clk);
+		__clk_disable(clk->parent);
+		__clk_disable(clk->secondary);
+	}
 }
 
 static int __clk_enable(struct clk *clk)
@@ -66,12 +67,13 @@ static int __clk_enable(struct clk *clk)
 	if (clk == NULL || IS_ERR(clk))
 		return -EINVAL;
 
-	__clk_enable(clk->parent);
-	__clk_enable(clk->secondary);
-
-	if (clk->usecount++ == 0 && clk->enable)
-		clk->enable(clk);
+	if (clk->usecount++ == 0) {
+		__clk_enable(clk->parent);
+		__clk_enable(clk->secondary);
 
+		if (clk->enable)
+			clk->enable(clk);
+	}
 	return 0;
 }
 
@@ -160,17 +162,28 @@ EXPORT_SYMBOL(clk_set_rate);
 int clk_set_parent(struct clk *clk, struct clk *parent)
 {
 	int ret = -EINVAL;
+	struct clk *old;
 
 	if (clk == NULL || IS_ERR(clk) || parent == NULL ||
 	    IS_ERR(parent) || clk->set_parent == NULL)
 		return ret;
 
+	if (clk->usecount)
+		clk_enable(parent);
+
 	mutex_lock(&clocks_mutex);
 	ret = clk->set_parent(clk, parent);
-	if (ret == 0)
+	if (ret == 0) {
+		old = clk->parent;
 		clk->parent = parent;
+	} else {
+		old = parent;
+	}
 	mutex_unlock(&clocks_mutex);
 
+	if (clk->usecount)
+		clk_disable(old);
+
 	return ret;
 }
 EXPORT_SYMBOL(clk_set_parent);