FAILED: Patch "iio: accel: adxl380: Avoid reading more entries than present in FIFO" failed to apply to 6.12-stable tree

[Sasha Levin <sashal@kernel.org>]

The patch below does not apply to the 6.12-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From c1b14015224cfcccd5356333763f2f4f401bd810 Mon Sep 17 00:00:00 2001
From: Francesco Lavra <flavra@baylibre.com>
Date: Mon, 19 Jan 2026 11:23:16 +0100
Subject: [PATCH] iio: accel: adxl380: Avoid reading more entries than present
 in FIFO

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 <flavra@baylibre.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 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 ba550142866a3..a77c2323d1aa4 100644
--- a/drivers/iio/accel/adxl380.c
+++ b/drivers/iio/accel/adxl380.c
@@ -966,6 +966,7 @@ static irqreturn_t adxl380_irq_handler(int irq, void  *p)
 	if (ret)
 		return IRQ_HANDLED;
 
+	fifo_entries = rounddown(fifo_entries, st->fifo_set_size);
 	for (i = 0; i < fifo_entries; i += st->fifo_set_size) {
 		ret = regmap_noinc_read(st->regmap, ADXL380_FIFO_DATA,
 					&st->fifo_buf[i],
-- 
2.51.0