From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- drivers/most/Kconfig | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 drivers/most/Kconfig (limited to 'drivers/most/Kconfig') diff --git a/drivers/most/Kconfig b/drivers/most/Kconfig new file mode 100644 index 000000000..69c9e728b --- /dev/null +++ b/drivers/most/Kconfig @@ -0,0 +1,45 @@ +# SPDX-License-Identifier: GPL-2.0 +menuconfig MOST + tristate "MOST (Media Oriented Systems Transport) support" + depends on HAS_DMA && CONFIGFS_FS + default n + help + Say Y here if you want to enable MOST support. + This driver needs at least one additional component to enable the + desired access from userspace (e.g. character devices) and one that + matches the network controller's hardware interface (e.g. USB). + + To compile this driver as a module, choose M here: the + module will be called most_core. + + If in doubt, say N here. + +if MOST +config MOST_USB_HDM + tristate "USB" + depends on USB + help + Say Y here if you want to connect via USB to network transceiver. + + To compile this driver as a module, choose M here: the + module will be called most_usb. + +config MOST_CDEV + tristate "Cdev" + + help + Say Y here if you want to commumicate via character devices. + + To compile this driver as a module, choose M here: the + module will be called most_cdev. + +config MOST_SND + tristate "Sound" + depends on SND + select SND_PCM + help + Say Y here if you want to commumicate via ALSA/sound devices. + + To compile this driver as a module, choose M here: the + module will be called most_sound. +endif -- cgit v1.3.1