linux-kernel - [PATCH] iio: adc: max9611: Fix temperature reading in probe

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Date:   Mon,  5 Aug 2019 17:55:15 +0200
From:   Jacopo Mondi <jacopo+renesas@...ndi.org>
To:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Stefan Agner <stefan@...er.ch>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] iio: adc: max9611: Fix temperature reading in probe

The max9611 driver reads the die temperature at probe time to validate
the communication channel. Use the actual read value to perform the test
instead of the read function return value, which was mistakenly used so
far.

The temperature reading test was only successful because the 0 return
value is in the range of supported temperatures.

Fixes: 69780a3bbc0b ("iio: adc: Add Maxim max9611 ADC driver")
Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
---
 drivers/iio/adc/max9611.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/max9611.c b/drivers/iio/adc/max9611.c
index 917223d5ff5b..e9f6b1da1b94 100644
--- a/drivers/iio/adc/max9611.c
+++ b/drivers/iio/adc/max9611.c
@@ -480,7 +480,7 @@ static int max9611_init(struct max9611_dev *max9611)
 	if (ret)
 		return ret;

-	regval = ret & MAX9611_TEMP_MASK;
+	regval &= MAX9611_TEMP_MASK;

 	if ((regval > MAX9611_TEMP_MAX_POS &&
 	     regval < MAX9611_TEMP_MIN_NEG) ||
--
2.22.0