linux-kernel - [PATCH] misc: ioc4: fix variable may be used uninitialized warning

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Date:	Mon, 8 Dec 2014 13:27:20 +0100
From:	Richard Leitner <dev@...l1n.net>
To:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] misc: ioc4: fix variable may be used uninitialized warning

Fix the following build warning:
drivers/misc/ioc4.c: In function ‘ioc4_probe’:
drivers/misc/ioc4.c:194:16: warning: ‘start’ may be used uninitialized
in this function [-Wmaybe-uninitialized]
  period = (end - start) /
                ^
drivers/misc/ioc4.c:148:11: note: ‘start’ was declared here
  uint64_t start, end, period;
           ^

As far as I can tell 'start' cannot really be used uninitialized
here, but for the sanity of gcc output explicitly initialize it.
Same goes for the 'end' variable.

Signed-off-by: Richard Leitner <dev@...l1n.net>
---
Used gcc version was 4.9.1 (Debian 4.9.1-19)
P.S.: I know I'm too late for 3.18 but hopefully it still helps.
---
 drivers/misc/ioc4.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/ioc4.c b/drivers/misc/ioc4.c
index 3336ddc..7ec2733 100644
--- a/drivers/misc/ioc4.c
+++ b/drivers/misc/ioc4.c
@@ -145,7 +145,7 @@ ioc4_clock_calibrate(struct ioc4_driver_data *idd)
 	union ioc4_int_out int_out;
 	union ioc4_gpcr gpcr;
 	unsigned int state, last_state = 1;
-	uint64_t start, end, period;
+	uint64_t start = 0, end = 0, period;
 	unsigned int count = 0;
 
 	/* Enable output */
-- 
2.1.3

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