linux-kernel - [PATCH 1/1] hwmon: (iio_hwmon) use dev_err

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Message-Id: <20230131103359.625081-1-alexander.stein@ew.tq-group.com>
Date:   Tue, 31 Jan 2023 11:33:59 +0100
From:   Alexander Stein <alexander.stein@...tq-group.com>
To:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     Alexander Stein <alexander.stein@...tq-group.com>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] hwmon: (iio_hwmon) use dev_err_probe

Instead of just returning an error code, add an error message as well.
While at it, simplify the code and use a common return path.
Upon deferral this also nicely lists the following message in
/sys/kernel/debug/devices_deferred:
adc     iio_hwmon: Failed to get channels

Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
---
 drivers/hwmon/iio_hwmon.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/hwmon/iio_hwmon.c b/drivers/hwmon/iio_hwmon.c
index 3aa40893fc09..4c8a80847891 100644
--- a/drivers/hwmon/iio_hwmon.c
+++ b/drivers/hwmon/iio_hwmon.c
@@ -77,9 +77,11 @@ static int iio_hwmon_probe(struct platform_device *pdev)
 
 	channels = devm_iio_channel_get_all(dev);
 	if (IS_ERR(channels)) {
-		if (PTR_ERR(channels) == -ENODEV)
-			return -EPROBE_DEFER;
-		return PTR_ERR(channels);
+		ret = PTR_ERR(channels);
+		if (ret == -ENODEV)
+			ret = -EPROBE_DEFER;
+		return dev_err_probe(dev, ret,
+				     "Failed to get channels\n");
 	}
 
 	st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);
-- 
2.34.1