linux-kernel - [PATCH] iioc: dac: ltc2664: Fix span variable usage in ltc2664_channel

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Message-ID: <20241004135454.5784-1-pvmohammedanees2003@gmail.com>
Date: Fri,  4 Oct 2024 19:24:54 +0530
From: Mohammed Anees <pvmohammedanees2003@...il.com>
To: linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Michael Hennerich <michael.hennerich@...log.com>,
	Kim Seer Paller <kimseer.paller@...log.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Mohammed Anees <pvmohammedanees2003@...il.com>
Subject: [PATCH] iioc: dac: ltc2664: Fix span variable usage in ltc2664_channel_config function

In the current implementation of the ltc2664_channel_config function,
a variable named span is declared and initialized to 0, intended to
capture the return value of the ltc2664_set_span function. However,
the output of ltc2664_set_span is directly assigned to chan->span,
leaving span unchanged. As a result, when the function later checks
if (span < 0), this condition will never trigger an error since
span remains 0, this flaw leads to ineffective error handling. The
current patch resolves this issue by checking chan->span rather than
span and also effectively removing span variable.

Signed-off-by: Mohammed Anees <pvmohammedanees2003@...il.com>
---
 drivers/iio/dac/ltc2664.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/dac/ltc2664.c b/drivers/iio/dac/ltc2664.c
index 5be5345ac5c8..64c8a51aad81 100644
--- a/drivers/iio/dac/ltc2664.c
+++ b/drivers/iio/dac/ltc2664.c
@@ -516,7 +516,7 @@ static int ltc2664_channel_config(struct ltc2664_state *st)
 	const struct ltc2664_chip_info *chip_info = st->chip_info;
 	struct device *dev = &st->spi->dev;
 	u32 reg, tmp[2], mspan;
-	int ret, span = 0;
+	int ret;
 
 	mspan = LTC2664_MSPAN_SOFTSPAN;
 	ret = device_property_read_u32(dev, "adi,manual-span-operation-config",
@@ -581,8 +581,8 @@ static int ltc2664_channel_config(struct ltc2664_state *st)
 		if (!ret && mspan == LTC2664_MSPAN_SOFTSPAN) {
 			chan->span = ltc2664_set_span(st, tmp[0] / 1000,
 						      tmp[1] / 1000, reg);
-			if (span < 0)
-				return dev_err_probe(dev, span,
+			if (chan->span < 0)
+				return dev_err_probe(dev, chan->span,
 						     "Failed to set span\n");
 		}
 
@@ -590,8 +590,8 @@ static int ltc2664_channel_config(struct ltc2664_state *st)
 						     tmp, ARRAY_SIZE(tmp));
 		if (!ret) {
 			chan->span = ltc2664_set_span(st, 0, tmp[1] / 1000, reg);
-			if (span < 0)
-				return dev_err_probe(dev, span,
+			if (chan->span < 0)
+				return dev_err_probe(dev, chan->span,
 						     "Failed to set span\n");
 		}
 	}
-- 
2.46.0