linux-kernel - [PATCH v2 6/7] iio: health: max30102: Use IIO cleanup helpers

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Message-Id: <20251211-lock-impr-v2-6-6fb47bdaaf24@gmail.com>
Date: Thu, 11 Dec 2025 21:45:24 -0500
From: Kurt Borja <kuurtb@...il.com>
To: Andy Shevchenko <andriy.shevchenko@...el.com>, 
 Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, Benson Leung <bleung@...omium.org>, 
 Antoniu Miclaus <antoniu.miclaus@...log.com>, 
 Gwendal Grignou <gwendal@...omium.org>, 
 Shrikant Raskar <raskar.shree97@...il.com>, 
 Per-Daniel Olsson <perdaniel.olsson@...s.com>
Cc: David Lechner <dlechner@...libre.com>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, Guenter Roeck <groeck@...omium.org>, 
 Jonathan Cameron <Jonathan.Cameron@...wei.com>, linux-iio@...r.kernel.org, 
 linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev, 
 Kurt Borja <kuurtb@...il.com>
Subject: [PATCH v2 6/7] iio: health: max30102: Use IIO cleanup helpers

Use IIO_DEV_GUARD_ANY_MODE() cleanup helper to simplify and drop
busy-waiting code in max30102_read_raw().

Signed-off-by: Kurt Borja <kuurtb@...il.com>
---
 drivers/iio/health/max30102.c | 33 +++++++++------------------------
 1 file changed, 9 insertions(+), 24 deletions(-)

diff --git a/drivers/iio/health/max30102.c b/drivers/iio/health/max30102.c
index 288c2f37a4a2..94e15598ffe7 100644
--- a/drivers/iio/health/max30102.c
+++ b/drivers/iio/health/max30102.c
@@ -467,44 +467,29 @@ static int max30102_read_raw(struct iio_dev *indio_dev,
 			     int *val, int *val2, long mask)
 {
 	struct max30102_data *data = iio_priv(indio_dev);
-	int ret = -EINVAL;
+	int ret;
 
 	switch (mask) {
-	case IIO_CHAN_INFO_RAW:
+	case IIO_CHAN_INFO_RAW: {
 		/*
 		 * Temperature reading can only be acquired when not in
 		 * shutdown; leave shutdown briefly when buffer not running
 		 */
-any_mode_retry:
-		if (!iio_device_claim_buffer_mode(indio_dev)) {
-			/*
-			 * This one is a *bit* hacky. If we cannot claim buffer
-			 * mode, then try direct mode so that we make sure
-			 * things cannot concurrently change. And we just keep
-			 * trying until we get one of the modes...
-			 */
-			if (!iio_device_claim_direct(indio_dev))
-				goto any_mode_retry;
+		IIO_DEV_GUARD_ANY_MODE(indio_dev);
 
-			ret = max30102_get_temp(data, val, true);
-			iio_device_release_direct(indio_dev);
-		} else {
-			ret = max30102_get_temp(data, val, false);
-			iio_device_release_buffer_mode(indio_dev);
-		}
+		ret = max30102_get_temp(data, val, !iio_buffer_enabled(indio_dev));
 		if (ret)
 			return ret;
 
-		ret = IIO_VAL_INT;
-		break;
+		return IIO_VAL_INT;
+	}
 	case IIO_CHAN_INFO_SCALE:
 		*val = 1000;  /* 62.5 */
 		*val2 = 16;
-		ret = IIO_VAL_FRACTIONAL;
-		break;
+		return IIO_VAL_FRACTIONAL;
+	default:
+		return -EINVAL;
 	}
-
-	return ret;
 }
 
 static const struct iio_info max30102_info = {

-- 
2.52.0