patch "iio: imu: st_lsm6dsx: fix possible lockup in st_lsm6dsx_read_fifo" added to char-misc-linus

This is a note to let you know that I've just added the patch titled

iio: imu: st_lsm6dsx: fix possible lockup in st_lsm6dsx_read_fifo

to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 159ca7f18129834b6f4c7eae67de48e96c752fc9 Mon Sep 17 00:00:00 2001
From: Silvano Seva <[email protected]>
Date: Tue, 11 Mar 2025 09:49:47 +0100
Subject: iio: imu: st_lsm6dsx: fix possible lockup in st_lsm6dsx_read_fifo

Prevent st_lsm6dsx_read_fifo from falling in an infinite loop in case pattern_len is equal to zero and the device FIFO is not empty.

---
 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c | 3 +++
 1 file changed, 3 insertions(+)

index 0a7cd8c1aa33..480a9b31065c 100644
@@ -392,6 +392,9 @@ int st_lsm6dsx_read_fifo(struct st_lsm6dsx_hw *hw)
 	if (fifo_status & cpu_to_le16(ST_LSM6DSX_FIFO_EMPTY_MASK))
 		return 0;
 
+	if (!pattern_len)
+		pattern_len = ST_LSM6DSX_SAMPLE_SIZE;
+
 	fifo_len = (le16_to_cpu(fifo_status) & fifo_diff_mask) *
 		   ST_LSM6DSX_CHAN_SIZE;
 	fifo_len = (fifo_len / pattern_len) * pattern_len;

2.49.0