[PATCH v4] ARM: w90x900: let clk_disable() return immediately if clk is NULL

From: Masahiro Yamada
Date: Sun Sep 18 2016 - 14:01:35 EST

In many of clk_disable() implementations, it is a no-op for a NULL
pointer input, but this is one of the exceptions.

Making it treewide consistent will allow clock consumers to call
clk_disable() without NULL pointer check.

Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Acked-by: Wan Zongshun <mcuos.com@xxxxxxxxx>

Changes in v4:
- Split into per-arch patches

Changes in v3:
- Return only when clk is NULL. Do not take care of error pointer.

Changes in v2:
- Rebase on Linux 4.6-rc1

arch/arm/mach-w90x900/clock.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arch/arm/mach-w90x900/clock.c b/arch/arm/mach-w90x900/clock.c
index 2c371ff..ac6fd1a 100644
--- a/arch/arm/mach-w90x900/clock.c
+++ b/arch/arm/mach-w90x900/clock.c
@@ -46,6 +46,9 @@ void clk_disable(struct clk *clk)
unsigned long flags;

+ if (!clk)
+ return;
WARN_ON(clk->enabled == 0);

spin_lock_irqsave(&clocks_lock, flags);