linux-kernel - [PATCH 17/28] iio: imu: inv_mpu6050: use = { } instead of memset()

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Message-Id: <20250611-iio-zero-init-stack-with-instead-of-memset-v1-17-ebb2d0a24302@baylibre.com>
Date: Wed, 11 Jun 2025 17:39:09 -0500
From: David Lechner <dlechner@...libre.com>
To: Michael Hennerich <michael.hennerich@...log.com>, 
 Lars-Peter Clausen <lars@...afoo.de>, Jonathan Cameron <jic23@...nel.org>, 
 Nuno Sá <nuno.sa@...log.com>, 
 Andy Shevchenko <andy@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Heiko Stuebner <heiko@...ech.de>, 
 Maxime Coquelin <mcoquelin.stm32@...il.com>, 
 Alexandre Torgue <alexandre.torgue@...s.st.com>, 
 Francesco Dolcini <francesco@...cini.it>, 
 João Paulo Gonçalves <jpaulo.silvagoncalves@...il.com>, 
 Leonard Göhrs <l.goehrs@...gutronix.de>, 
 kernel@...gutronix.de, Oleksij Rempel <o.rempel@...gutronix.de>, 
 Roan van Dijk <roan@...tonic.nl>, 
 Tomasz Duszynski <tomasz.duszynski@...akon.com>, 
 Jacopo Mondi <jacopo@...ndi.org>, 
 Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@....com>, 
 Mudit Sharma <muditsharma.info@...il.com>, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>, 
 Ondřej Jirman <megi@....cz>, 
 Andreas Klinger <ak@...klinger.de>, 
 Petre Rodan <petre.rodan@...dimension.ro>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
 linux-rockchip@...ts.infradead.org, 
 linux-stm32@...md-mailman.stormreply.com, 
 David Lechner <dlechner@...libre.com>
Subject: [PATCH 17/28] iio: imu: inv_mpu6050: use = { } instead of memset()

Use { } instead of memset() to zero-initialize stack memory to simplify
the code.

Signed-off-by: David Lechner <dlechner@...libre.com>
---
 drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c | 4 +---
 drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c | 6 ++----
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c
index a9bcf02e5b43fac0e210c6f78816a3c042b52f3d..460792ed27e03192464066dfa088734f0b6b1cdf 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_acpi.c
@@ -130,12 +130,10 @@ int inv_mpu_acpi_create_mux_client(struct i2c_client *client)
 
 	st->mux_client = NULL;
 	if (adev) {
-		struct i2c_board_info info;
+		struct i2c_board_info info = { };
 		struct i2c_client *mux_client;
 		int ret = -1;
 
-		memset(&info, 0, sizeof(info));
-
 		dmi_check_system(inv_mpu_dev_list);
 		switch (matched_product_name) {
 		case INV_MPU_ASUS_T100TA:
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
index 273196e647a2b5a4860e18cfa34a088c773540e4..c4c11124f92f7fa6730e7443e3be67d920b8c115 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c
@@ -50,7 +50,8 @@ irqreturn_t inv_mpu6050_read_fifo(int irq, void *p)
 	u16 fifo_count;
 	u32 fifo_period;
 	s64 timestamp;
-	u8 data[INV_MPU6050_OUTPUT_DATA_SIZE] __aligned(8);
+	/* clear internal data buffer for avoiding kernel data leak */
+	u8 data[INV_MPU6050_OUTPUT_DATA_SIZE] __aligned(8) = { };
 	size_t i, nb;
 
 	mutex_lock(&st->lock);
@@ -103,9 +104,6 @@ irqreturn_t inv_mpu6050_read_fifo(int irq, void *p)
 	inv_sensors_timestamp_interrupt(&st->timestamp, 1, pf->timestamp);
 	inv_sensors_timestamp_apply_odr(&st->timestamp, fifo_period, 1, 0);
 
-	/* clear internal data buffer for avoiding kernel data leak */
-	memset(data, 0, sizeof(data));
-
 	/* read all data once and process every samples */
 	result = regmap_noinc_read(st->map, st->reg->fifo_r_w, st->data, fifo_count);
 	if (result)

-- 
2.43.0