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Mon, 19 Jan 2026 02:23:19 -0800 (PST) From: Francesco Lavra To: Ramona Gradinariu , Antoniu Miclaus , Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/2] iio: accel: adxl380: Avoid reading more entries than present in FIFO Date: Mon, 19 Jan 2026 11:23:16 +0100 Message-Id: <20260119102317.1565417-2-flavra@baylibre.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20260119102317.1565417-1-flavra@baylibre.com> References: <20260119102317.1565417-1-flavra@baylibre.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1303; i=flavra@baylibre.com; h=from:subject; bh=b+ZyQVIas6VPm4FBmMWpHOQTnZTRtHnI8+5I56aAQss=; b=owEB7QES/pANAwAKAe3xO3POlDZfAcsmYgBpbgX9FkVZqlUNrnX4LtIpXBVJHXRIcY3Uiw5dN 8fSd/u8y3qJAbMEAAEKAB0WIQSGV4VPlTvcox7DFObt8TtzzpQ2XwUCaW4F/QAKCRDt8TtzzpQ2 X+qUC/9y8t4H8mzP+QWp13I8lR987Hrsa798RRcpruf8SdBOhpYnpwHp8ZHvqIT3kCe+dMcoEeN r3nOuzyCWtfyuKqR4eQgEwm+xPDqSJvuVYKEwCpS7sPEPSGP1bnHIp+dVwpldR1MxLkAvR36/40 SE0ZLge0hQo/H9fhtUtI/HXCRCXXyp6NLzuH37FDy8+tgjwwEm93nIvwc13dyiEPsAgN6MSiRUh aPRXqgH+Wly6X7RKt3wA+Wp0Mkyp12U04dYT/u49zgrnnASeo5tmPPVW06DcD1Kadgzpqs2a2CN L5rB5hCdkIhBVfOpoFNZbzic561Mg9cMIDUxE9PJ9dvp4nJHqdzkRPWZCGmtZnzwmy4QSpZwHkw Yr+/FJJitoE+jYuRHvEqHepkwZV/Nv4dRg5IvO8aGjvW6EczKEpXcVGsal5s7jIKejzb6M55kx+ ZHZV3/2LKQmS3tcU/yTCa3CSoBg43yWBLh7ncp5bOZyLZvGSGYMUclGxrNWrOwXVnOtHU= X-Developer-Key: i=flavra@baylibre.com; a=openpgp; fpr=8657854F953BDCA31EC314E6EDF13B73CE94365F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The interrupt handler reads FIFO entries in batches of N samples, where N is the number of scan elements that have been enabled. However, the sensor fills the FIFO one sample at a time, even when more than one channel is enabled. Therefore,the number of entries reported by the FIFO status registers may not be a multiple of N; if this number is not a multiple, the number of entries read from the FIFO may exceed the number of entries actually present. To fix the above issue, round down the number of FIFO entries read from the status registers so that it is always a multiple of N. Fixes: df36de13677a ("iio: accel: add ADXL380 driver") Signed-off-by: Francesco Lavra --- drivers/iio/accel/adxl380.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/iio/accel/adxl380.c b/drivers/iio/accel/adxl380.c index ac20fcfd4e22..650cdbffd4a7 100644 --- a/drivers/iio/accel/adxl380.c +++ b/drivers/iio/accel/adxl380.c @@ -964,6 +964,7 @@ static irqreturn_t adxl380_irq_handler(int irq, void *= p) if (ret) return IRQ_HANDLED; =20 + fifo_entries =3D rounddown(fifo_entries, st->fifo_set_size); for (i =3D 0; i < fifo_entries; i +=3D st->fifo_set_size) { ret =3D regmap_noinc_read(st->regmap, ADXL380_FIFO_DATA, &st->fifo_buf[i], --=20 2.39.5