linux-kernel - [PATCH] iio: proximity: vl53l0x-i2c: use stack allocated scan struct

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Message-Id: <20250722-iio-proximity-vl53l0x-i2c-use-stack-allocated-scan-struct-v1-1-42f127a6834f@baylibre.com>
Date: Tue, 22 Jul 2025 17:26:39 -0500
From: David Lechner <dlechner@...libre.com>
To: Song Qiang <songqiang1304521@...il.com>, 
 Jonathan Cameron <jic23@...nel.org>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 David Lechner <dlechner@...libre.com>
Subject: [PATCH] iio: proximity: vl53l0x-i2c: use stack allocated scan
 struct

Use a stack allocated struct for the scan data instead of using the
driver state to store the struct. The scan data is not used outside of
the interrupt handler function so the struct does not need to exist
outside of that scope.

Signed-off-by: David Lechner <dlechner@...libre.com>
---
 drivers/iio/proximity/vl53l0x-i2c.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/proximity/vl53l0x-i2c.c b/drivers/iio/proximity/vl53l0x-i2c.c
index ef4aa7b2835e3c9e177f3e03b24a141ac45c3825..b4d82f24be296c37e9243167b463bf96368e8ec4 100644
--- a/drivers/iio/proximity/vl53l0x-i2c.c
+++ b/drivers/iio/proximity/vl53l0x-i2c.c
@@ -57,11 +57,6 @@ struct vl53l0x_data {
 	struct regulator *vdd_supply;
 	struct gpio_desc *reset_gpio;
 	struct iio_trigger *trig;
-
-	struct {
-		u16 chan;
-		aligned_s64 timestamp;
-	} scan;
 };
 
 static int vl53l0x_clear_irq(struct vl53l0x_data *data)
@@ -84,6 +79,10 @@ static irqreturn_t vl53l0x_trigger_handler(int irq, void *priv)
 	struct vl53l0x_data *data = iio_priv(indio_dev);
 	u8 buffer[12];
 	int ret;
+	struct {
+		u16 chan;
+		aligned_s64 timestamp;
+	} scan = { };
 
 	ret = i2c_smbus_read_i2c_block_data(data->client,
 					VL_REG_RESULT_RANGE_STATUS,
@@ -93,8 +92,8 @@ static irqreturn_t vl53l0x_trigger_handler(int irq, void *priv)
 	else if (ret != 12)
 		return -EREMOTEIO;
 
-	data->scan.chan = get_unaligned_be16(&buffer[10]);
-	iio_push_to_buffers_with_ts(indio_dev, &data->scan, sizeof(data->scan),
+	scan.chan = get_unaligned_be16(&buffer[10]);
+	iio_push_to_buffers_with_ts(indio_dev, &scan, sizeof(scan),
 				    iio_get_time_ns(indio_dev));
 
 	iio_trigger_notify_done(indio_dev->trig);

---
base-commit: cd2731444ee4e35db76f4fb587f12d327eec5446
change-id: 20250722-iio-proximity-vl53l0x-i2c-use-stack-allocated-scan-struct-fc9cafcbcf9d

Best regards,
-- 
David Lechner <dlechner@...libre.com>