linux-kernel - [PATCH V4 1/8] opp: of_init_opp_table(): return -ENOSYS when feature isn't implemented

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Date:	Tue, 27 May 2014 17:20:50 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	rjw@...ysocki.net
Cc:	linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, arvind.chauhan@....com,
	inderpal.s@...sung.com, nm@...com, chander.kashyap@...aro.org,
	pavel@....cz, len.brown@...el.com, sudeep.holla@....com,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: [PATCH V4 1/8] opp: of_init_opp_table(): return -ENOSYS when feature isn't implemented

When none of CONFIG_PM_OPP or CONFIG_OF is enabled we use the dummy
implementation of of_init_opp_table() routine, which returns -EINVAL currently.
-EINVAL can confuse the callers a bit as it can have other meanings for the
actual implementation of this routine.

It is more appropriate to return -ENOSYS instead to avoid confusion at caller.

Suggested-and-reviewed-by: Sudeep Holla <sudeep.holla@....com>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 include/linux/pm_opp.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 0330217..6668150 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -112,7 +112,7 @@ int of_init_opp_table(struct device *dev);
 #else
 static inline int of_init_opp_table(struct device *dev)
 {
-	return -EINVAL;
+	return -ENOSYS;
 }
 #endif
 
-- 
2.0.0.rc2

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