linux-kernel - Re: [PATCH RFC v1 3/5] clk: remove unneeded __clk_enable and __clk

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Date:	Thu, 30 Apr 2015 15:05:48 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Dong Aisheng <aisheng.dong@...escale.com>,
	linux-clk@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, mturquette@...aro.org,
	shawn.guo@...aro.org, b29396@...escale.com,
	linux-arm-kernel@...ts.infradead.org,
	Ranjani.Vaidyanathan@...escale.com, b20596@...escale.com,
	r64343@...escale.com, b20788@...escale.com
Subject: Re: [PATCH RFC v1 3/5] clk: remove unneeded __clk_enable and
 __clk_disable

On 04/30, Stephen Boyd wrote:
> On 04/15/15 07:26, Dong Aisheng wrote:
> > The only thing __clk_enable/__clk_disable does is NULL pointer checking
> > of clk except calling clk_core_{enable|disable} which is already handled
> > by clk_core_{enable|disable}.
> > So remove this unneeded function.
> >
> > Cc: Mike Turquette <mturquette@...aro.org>
> > Cc: Stephen Boyd <sboyd@...eaurora.org>
> > Signed-off-by: Dong Aisheng <aisheng.dong@...escale.com>
> > ---
> 
> No. You can call clk_enable() and clk_disable() with NULL and it should
> be a no-op. With this change it would cause a NULL pointer exception.
> 

Here's the proper patch. I'll leave you as author.

---8<---
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 0227ac3d5b1a..e45255226ffa 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1023,14 +1023,6 @@ static void clk_core_disable(struct clk_core *core)
 	clk_core_disable(core->parent);
 }
 
-static void __clk_disable(struct clk *clk)
-{
-	if (!clk)
-		return;
-
-	clk_core_disable(clk->core);
-}
-
 /**
  * clk_disable - gate a clock
  * @clk: the clk being gated
@@ -1051,7 +1043,7 @@ void clk_disable(struct clk *clk)
 		return;
 
 	flags = clk_enable_lock();
-	__clk_disable(clk);
+	clk_core_disable(clk->core);
 	clk_enable_unlock(flags);
 }
 EXPORT_SYMBOL_GPL(clk_disable);
@@ -1089,14 +1081,6 @@ static int clk_core_enable(struct clk_core *core)
 	return 0;
 }
 
-static int __clk_enable(struct clk *clk)
-{
-	if (!clk)
-		return 0;
-
-	return clk_core_enable(clk->core);
-}
-
 /**
  * clk_enable - ungate a clock
  * @clk: the clk being ungated
@@ -1115,8 +1099,11 @@ int clk_enable(struct clk *clk)
 	unsigned long flags;
 	int ret;
 
+	if (!clk)
+		return 0;
+
 	flags = clk_enable_lock();
-	ret = __clk_enable(clk);
+	ret = clk_core_enable(clk->core);
 	clk_enable_unlock(flags);
 
 	return ret;

-- 
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