linux-kernel - [PATCH 09/19] mfd/twl4030: don't warn about uninitialized return code

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Message-Id: <1359153858-31992-10-git-send-email-arnd@arndb.de>
Date:	Fri, 25 Jan 2013 22:44:08 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Kevin Hilman <khilman@...prootsystems.com>,
	"Kristo, Tero" <t-kristo@...com>
Subject: [PATCH 09/19] mfd/twl4030: don't warn about uninitialized return code

If the twl4030_write_script function gets called with
a zero length argument, its return value does not
get set. We know that all scripts have a nonzero
length, but returning an error in case they ever
do is probably appropriate.

Without this patch, building omap2plus_defconfig results in:

drivers/mfd/twl4030-power.c: In function 'load_twl4030_script':
drivers/mfd/twl4030-power.c:414:5: error: 'err' may be used uninitialized in this function

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@...com>
Reviewed-by: Amit Kucheria <amit.kucheria@...aro.org>
Cc: Samuel Ortiz <sameo@...ux.intel.com>
Cc: Kevin Hilman <khilman@...prootsystems.com>
Cc: "Kristo, Tero" <t-kristo@...com>
---
 drivers/mfd/twl4030-power.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c
index 4dae241..dd362c1 100644
--- a/drivers/mfd/twl4030-power.c
+++ b/drivers/mfd/twl4030-power.c
@@ -159,7 +159,7 @@ out:
 static int twl4030_write_script(u8 address, struct twl4030_ins *script,
 				       int len)
 {
-	int err;
+	int err = -EINVAL;
 
 	for (; len; len--, address++, script++) {
 		if (len == 1) {
-- 
1.8.0

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