linux-kernel - [PATCH V4 2/2] PM / OPP: Fix static checker warning (broken 64bit big endian systems)

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Date:	Mon, 17 Aug 2015 19:20:20 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Rafael Wysocki <rjw@...ysocki.net>
Cc:	linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
	dan.carpenter@...cle.com, nm@...com, sboyd@...eaurora.org,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Len Brown <len.brown@...el.com>,
	linux-kernel@...r.kernel.org (open list),
	Pavel Machek <pavel@....cz>
Subject: [PATCH V4 2/2] PM / OPP: Fix static checker warning (broken 64bit big endian systems)

Dan Carpenter reported (generated with static checker):

drivers/base/power/opp.c:949 _opp_add_static_v2()
warn: passing casted pointer '&new_opp->clock_latency_ns' to
'of_property_read_u32()' 64 vs 32.

This code will break on 64 bit, big endian machines.

Fix this by reading the value in a u32 type variable first and then
assigning it to the unsigned long variable.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Suggested-by: Stephen Boyd <sboyd@...eaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
V3->V4:
- Assign values only if of_property_read_u32() is successful.

 drivers/base/power/opp.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index 4d6c4576f7ae..803d8b7ced89 100644
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -918,6 +918,7 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
 	struct device_opp *dev_opp;
 	struct dev_pm_opp *new_opp;
 	u64 rate;
+	u32 val;
 	int ret;
 
 	/* Hold our list modification lock here */
@@ -946,14 +947,16 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)
 	new_opp->np = np;
 	new_opp->dynamic = false;
 	new_opp->available = true;
-	of_property_read_u32(np, "clock-latency-ns",
-			     (u32 *)&new_opp->clock_latency_ns);
+
+	if (!of_property_read_u32(np, "clock-latency-ns", &val))
+		new_opp->clock_latency_ns = val;
 
 	ret = opp_get_microvolt(new_opp, dev);
 	if (ret)
 		goto free_opp;
 
-	of_property_read_u32(np, "opp-microamp", (u32 *)&new_opp->u_amp);
+	if (!of_property_read_u32(new_opp->np, "opp-microamp", &val))
+		new_opp->u_amp = val;
 
 	ret = _opp_add(dev, new_opp, dev_opp);
 	if (ret)
-- 
2.4.0

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