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/dwc3/io.h | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 drivers/usb/dwc3/io.h (limited to 'drivers/usb/dwc3/io.h') diff --git a/drivers/usb/dwc3/io.h b/drivers/usb/dwc3/io.h new file mode 100644 index 000000000..cad9a2ae1 --- /dev/null +++ b/drivers/usb/dwc3/io.h @@ -0,0 +1,60 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * io.h - DesignWare USB3 DRD IO Header + * + * Copyright (C) 2010-2011 Texas Instruments Incorporated - https://www.ti.com + * + * Authors: Felipe Balbi , + * Sebastian Andrzej Siewior + */ + +#ifndef __DRIVERS_USB_DWC3_IO_H +#define __DRIVERS_USB_DWC3_IO_H + +#include +#include "trace.h" +#include "debug.h" +#include "core.h" + +static inline u32 dwc3_readl(struct dwc3 *dwc, u32 offset) +{ + u32 value; + void __iomem *base = dwc->regs; + + /* + * We requested the mem region starting from the Globals address + * space, see dwc3_probe in core.c. + * However, the offsets are given starting from xHCI address space. + */ + value = readl(base + offset - DWC3_GLOBALS_REGS_START); + + /* + * When tracing we want to make it easy to find the correct address on + * documentation, so we revert it back to the proper addresses, the + * same way they are described on SNPS documentation + */ + trace_dwc3_readl(dwc, base - DWC3_GLOBALS_REGS_START, offset, value); + + return value; +} + +static inline void dwc3_writel(struct dwc3 *dwc, u32 offset, u32 value) +{ + void __iomem *base = dwc->regs; + + /* + * We requested the mem region starting from the Globals address + * space, see dwc3_probe in core.c. + * However, the offsets are given starting from xHCI address space. + */ + writel(value, base + offset - DWC3_GLOBALS_REGS_START); + + /* + * When tracing we want to make it easy to find the correct address on + * documentation, so we revert it back to the proper addresses, the + * same way they are described on SNPS documentation + */ + trace_dwc3_writel(dwc, base - DWC3_GLOBALS_REGS_START, offset, value); +} + +#endif /* __DRIVERS_USB_DWC3_IO_H */ -- cgit v1.3.1