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/input/misc/m68kspkr.c | 142 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 142 insertions(+) create mode 100644 drivers/input/misc/m68kspkr.c (limited to 'drivers/input/misc/m68kspkr.c') diff --git a/drivers/input/misc/m68kspkr.c b/drivers/input/misc/m68kspkr.c new file mode 100644 index 000000000..0542334df --- /dev/null +++ b/drivers/input/misc/m68kspkr.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * m68k beeper driver for Linux + * + * Copyright (c) 2002 Richard Zidlicky + * Copyright (c) 2002 Vojtech Pavlik + * Copyright (c) 1992 Orest Zborowski + */ + + +#include +#include +#include +#include +#include +#include +#include + +MODULE_AUTHOR("Richard Zidlicky "); +MODULE_DESCRIPTION("m68k beeper driver"); +MODULE_LICENSE("GPL"); + +static struct platform_device *m68kspkr_platform_device; + +static int m68kspkr_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) +{ + unsigned int count = 0; + + if (type != EV_SND) + return -1; + + switch (code) { + case SND_BELL: if (value) value = 1000; + case SND_TONE: break; + default: return -1; + } + + if (value > 20 && value < 32767) + count = 1193182 / value; + + mach_beep(count, -1); + + return 0; +} + +static int m68kspkr_probe(struct platform_device *dev) +{ + struct input_dev *input_dev; + int err; + + input_dev = input_allocate_device(); + if (!input_dev) + return -ENOMEM; + + input_dev->name = "m68k beeper"; + input_dev->phys = "m68k/generic"; + input_dev->id.bustype = BUS_HOST; + input_dev->id.vendor = 0x001f; + input_dev->id.product = 0x0001; + input_dev->id.version = 0x0100; + input_dev->dev.parent = &dev->dev; + + input_dev->evbit[0] = BIT_MASK(EV_SND); + input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE); + input_dev->event = m68kspkr_event; + + err = input_register_device(input_dev); + if (err) { + input_free_device(input_dev); + return err; + } + + platform_set_drvdata(dev, input_dev); + + return 0; +} + +static void m68kspkr_remove(struct platform_device *dev) +{ + struct input_dev *input_dev = platform_get_drvdata(dev); + + input_unregister_device(input_dev); + /* turn off the speaker */ + m68kspkr_event(NULL, EV_SND, SND_BELL, 0); +} + +static void m68kspkr_shutdown(struct platform_device *dev) +{ + /* turn off the speaker */ + m68kspkr_event(NULL, EV_SND, SND_BELL, 0); +} + +static struct platform_driver m68kspkr_platform_driver = { + .driver = { + .name = "m68kspkr", + }, + .probe = m68kspkr_probe, + .remove = m68kspkr_remove, + .shutdown = m68kspkr_shutdown, +}; + +static int __init m68kspkr_init(void) +{ + int err; + + if (!mach_beep) { + printk(KERN_INFO "m68kspkr: no lowlevel beep support\n"); + return -ENODEV; + } + + err = platform_driver_register(&m68kspkr_platform_driver); + if (err) + return err; + + m68kspkr_platform_device = platform_device_alloc("m68kspkr", -1); + if (!m68kspkr_platform_device) { + err = -ENOMEM; + goto err_unregister_driver; + } + + err = platform_device_add(m68kspkr_platform_device); + if (err) + goto err_free_device; + + return 0; + + err_free_device: + platform_device_put(m68kspkr_platform_device); + err_unregister_driver: + platform_driver_unregister(&m68kspkr_platform_driver); + + return err; +} + +static void __exit m68kspkr_exit(void) +{ + platform_device_unregister(m68kspkr_platform_device); + platform_driver_unregister(&m68kspkr_platform_driver); +} + +module_init(m68kspkr_init); +module_exit(m68kspkr_exit); -- cgit v1.3.1