linux-kernel - [PATCH 09/13] clk: Make clk_get

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Date:	Wed, 11 Apr 2012 18:02:47 -0700
From:	Mike Turquette <mturquette@...aro.org>
To:	<arnd.bergmann@...aro.org>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linaro-dev@...ts.linaro.org>, <patches@...aro.org>,
	Rajendra Nayak <rnayak@...com>,
	Mike Turquette <mturquette@...aro.org>,
	Olof Johansson <olof@...om.net>,
	Russell King <linux@....linux.org.uk>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Shawn Guo <shawn.guo@...escale.com>,
	Richard Zhao <richard.zhao@...aro.org>,
	Saravana Kannan <skannan@...eaurora.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Andrew Lunn <andrew@...n.ch>,
	Viresh Kumar <viresh.kumar@...com>
Subject: [PATCH 09/13] clk: Make clk_get_rate() return 0 on error

From: Rajendra Nayak <rnayak@...com>

Most users of clk_get_rate() actually assume a non zero
return value as a valid rate returned. Returing -EINVAL
might confuse such users, so make it instead return zero
on error.

Besides the return value of clk_get_rate seems to be
'unsigned long'.

Signed-off-by: Rajendra nayak <rnayak@...com>
Signed-off-by: Mike Turquette <mturquette@...aro.org>
Cc: Arnd Bergman <arnd.bergmann@...aro.org>
Cc: Olof Johansson <olof@...om.net>
Cc: Russell King <linux@....linux.org.uk>
Cc: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Shawn Guo <shawn.guo@...escale.com>
Cc: Richard Zhao <richard.zhao@...aro.org>
Cc: Saravana Kannan <skannan@...eaurora.org>
Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Viresh Kumar <viresh.kumar@...com>
---
 drivers/clk/clk.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 9924aec..a24b121 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -285,7 +285,7 @@ unsigned long __clk_get_rate(struct clk *clk)
 	unsigned long ret;
 
 	if (!clk) {
-		ret = -EINVAL;
+		ret = 0;
 		goto out;
 	}
 
@@ -295,7 +295,7 @@ unsigned long __clk_get_rate(struct clk *clk)
 		goto out;
 
 	if (!clk->parent)
-		ret = -ENODEV;
+		ret = 0;
 
 out:
 	return ret;
@@ -560,7 +560,7 @@ EXPORT_SYMBOL_GPL(clk_enable);
  * @clk: the clk whose rate is being returned
  *
  * Simply returns the cached rate of the clk.  Does not query the hardware.  If
- * clk is NULL then returns -EINVAL.
+ * clk is NULL then returns 0.
  */
 unsigned long clk_get_rate(struct clk *clk)
 {
-- 
1.7.5.4

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