linux-kernel - [PATCH] iio: adc: fix uninitialized variable warning

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Date:   Mon,  4 Mar 2019 21:03:07 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Jonathan Cameron <jic23@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-arm-msm@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] iio: adc: fix uninitialized variable warning

The pm8xxx_xoadc_probe() function triggers a bogus warning
about an uninitialized variable:

drivers/iio/adc/qcom-pm8xxx-xoadc.c: In function 'pm8xxx_xoadc_probe':
drivers/iio/adc/qcom-pm8xxx-xoadc.c:633:8: error: 'ch' may be used uninitialized in this function [-Werror=maybe-uninitialized]

Reword the function so the compiler can see more easily that it
is always initialized.

Fixes: 63c3ecd946d4 ("iio: adc: add a driver for Qualcomm PM8xxx HK/XOADC")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/iio/adc/qcom-pm8xxx-xoadc.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/iio/adc/qcom-pm8xxx-xoadc.c b/drivers/iio/adc/qcom-pm8xxx-xoadc.c
index c30c002f1fef..7939238001c8 100644
--- a/drivers/iio/adc/qcom-pm8xxx-xoadc.c
+++ b/drivers/iio/adc/qcom-pm8xxx-xoadc.c
@@ -423,7 +423,7 @@ static irqreturn_t pm8xxx_eoc_irq(int irq, void *d)
 static struct pm8xxx_chan_info *
 pm8xxx_get_channel(struct pm8xxx_xoadc *adc, u8 chan)
 {
-	struct pm8xxx_chan_info *ch;
+	struct pm8xxx_chan_info *ch = NULL;
 	int i;
 
 	for (i = 0; i < adc->nchans; i++) {
@@ -431,8 +431,6 @@ pm8xxx_get_channel(struct pm8xxx_xoadc *adc, u8 chan)
 		if (ch->hwchan->amux_channel == chan)
 			break;
 	}
-	if (i == adc->nchans)
-		return NULL;
 
 	return ch;
 }
-- 
2.20.0