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/image/Kconfig | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 drivers/usb/image/Kconfig (limited to 'drivers/usb/image/Kconfig') diff --git a/drivers/usb/image/Kconfig b/drivers/usb/image/Kconfig new file mode 100644 index 000000000..a65c638e7 --- /dev/null +++ b/drivers/usb/image/Kconfig @@ -0,0 +1,29 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# USB Imaging devices configuration +# +comment "USB Imaging devices" + +config USB_MDC800 + tristate "USB Mustek MDC800 Digital Camera support" + help + Say Y here if you want to connect this type of still camera to + your computer's USB port. This driver can be used with gphoto 0.4.3 + and higher (look at ). + To use it create a device node with "mknod /dev/mustek c 180 32" and + configure it in your software. + + To compile this driver as a module, choose M here: the + module will be called mdc800. + +config USB_MICROTEK + tristate "Microtek X6USB scanner support" + depends on SCSI + help + Say Y here if you want support for the Microtek X6USB and + possibly the Phantom 336CX, Phantom C6 and ScanMaker V6U(S)L. + Support for anything but the X6 is experimental. + Please report failures and successes. + The scanner will appear as a scsi generic device to the rest + of the system. Scsi support is required. + This driver can be compiled as a module, called microtek. -- cgit v1.3.1