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/usb/class/Kconfig | 49 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 drivers/usb/class/Kconfig (limited to 'drivers/usb/class/Kconfig') diff --git a/drivers/usb/class/Kconfig b/drivers/usb/class/Kconfig new file mode 100644 index 000000000..d3f5162bd --- /dev/null +++ b/drivers/usb/class/Kconfig @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# USB Class driver configuration +# +comment "USB Device Class drivers" + +config USB_ACM + tristate "USB Modem (CDC ACM) support" + depends on TTY + help + This driver supports USB modems and ISDN adapters which support the + Communication Device Class Abstract Control Model interface. + Please read for details. + + If your modem only reports "Cls=ff(vend.)" in the descriptors in + /sys/kernel/debug/usb/devices, then your modem will not work with this + driver. + + To compile this driver as a module, choose M here: the + module will be called cdc-acm. + +config USB_PRINTER + tristate "USB Printer support" + help + Say Y here if you want to connect a USB printer to your computer's + USB port. + + To compile this driver as a module, choose M here: the + module will be called usblp. + +config USB_WDM + tristate "USB Wireless Device Management support" + help + This driver supports the WMC Device Management functionality + of cell phones compliant to the CDC WMC specification. You can use + AT commands over this device. + + To compile this driver as a module, choose M here: the + module will be called cdc-wdm. + +config USB_TMC + tristate "USB Test and Measurement Class support" + help + Say Y here if you want to connect a USB device that follows + the USB.org specification for USB Test and Measurement devices + to your computer's USB port. + + To compile this driver as a module, choose M here: the + module will be called usbtmc. -- cgit v1.3.1