linux-kernel - [PATCH] iio: inkern: fix channel read regression

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Message-ID: <20240530074416.13697-1-johan+linaro@kernel.org>
Date: Thu, 30 May 2024 09:44:16 +0200
From: Johan Hovold <johan+linaro@...nel.org>
To: Jonathan Cameron <jic23@...nel.org>
Cc: Lars-Peter Clausen <lars@...afoo.de>,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Johan Hovold <johan+linaro@...nel.org>,
	Nuno Sa <nuno.sa@...log.com>
Subject: [PATCH] iio: inkern: fix channel read regression

A recent "cleanup" broke IIO channel read outs and thereby thermal
mitigation on the Lenovo ThinkPad X13s by returning zero instead of the
expected IIO value type in iio_read_channel_processed_scale():

	thermal thermal_zone12: failed to read out thermal zone (-22)

Fixes: 3092bde731ca ("iio: inkern: move to the cleanup.h magic")
Cc: Nuno Sa <nuno.sa@...log.com>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---
 drivers/iio/inkern.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


Someone should re-review the offending commit so that there are no more
of these subtle regressions that are bound to happen when people use
cleanup.h to save a few lines of code at the cost of readability.

Johan



diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index 52d773261828..485e6fc44a04 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -721,7 +721,7 @@ int iio_read_channel_processed_scale(struct iio_channel *chan, int *val,
 			return ret;
 		*val *= scale;
 
-		return 0;
+		return ret;
 	} else {
 		ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW);
 		if (ret < 0)
-- 
2.44.1