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/gpib/include/gpibP.h | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 drivers/gpib/include/gpibP.h (limited to 'drivers/gpib/include/gpibP.h') diff --git a/drivers/gpib/include/gpibP.h b/drivers/gpib/include/gpibP.h new file mode 100644 index 000000000..e3938ada3 --- /dev/null +++ b/drivers/gpib/include/gpibP.h @@ -0,0 +1,41 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +/*************************************************************************** + * copyright : (C) 2002,2003 by Frank Mori Hess + ***************************************************************************/ + +#ifndef _GPIB_P_H +#define _GPIB_P_H + +#include + +#include "gpib_types.h" +#include "gpib_proto.h" +#include "gpib_cmd.h" +#include +#include + +#include +#include +#include + +int gpib_register_driver(struct gpib_interface *interface, struct module *mod); +void gpib_unregister_driver(struct gpib_interface *interface); +struct pci_dev *gpib_pci_get_device(const struct gpib_board_config *config, unsigned int vendor_id, + unsigned int device_id, struct pci_dev *from); +struct pci_dev *gpib_pci_get_subsys(const struct gpib_board_config *config, unsigned int vendor_id, + unsigned int device_id, unsigned int ss_vendor, + unsigned int ss_device, struct pci_dev *from); +unsigned int num_gpib_events(const struct gpib_event_queue *queue); +int push_gpib_event(struct gpib_board *board, short event_type); +int pop_gpib_event(struct gpib_board *board, struct gpib_event_queue *queue, short *event_type); +int gpib_request_pseudo_irq(struct gpib_board *board, irqreturn_t (*handler)(int, void *)); +void gpib_free_pseudo_irq(struct gpib_board *board); +int gpib_match_device_path(struct device *dev, const char *device_path_in); + +extern struct gpib_board board_array[GPIB_MAX_NUM_BOARDS]; + +extern struct list_head registered_drivers; + +#endif // _GPIB_P_H + -- cgit v1.3.1