ftrace: Synchronize the initialization of ftrace_opsgrafted

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 <rostedt@goodmis.org>

1 files changed, 59 insertions, 0 deletions

diff --git a/drivers/pinctrl/sprd/pinctrl-sprd.h b/drivers/pinctrl/sprd/pinctrl-sprd.h
new file mode 100644
index 000000000..190bcdb3b
--- /dev/null
+++ b/drivers/pinctrl/sprd/pinctrl-sprd.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Driver header file for pin controller driver
+ * Copyright (C) 2017 Spreadtrum  - http://www.spreadtrum.com
+ */
+
+#ifndef __PINCTRL_SPRD_H__
+#define __PINCTRL_SPRD_H__
+
+struct platform_device;
+
+#define NUM_OFFSET	(20)
+#define TYPE_OFFSET	(16)
+#define BIT_OFFSET	(8)
+#define WIDTH_OFFSET	(4)
+
+#define SPRD_PIN_INFO(num, type, offset, width, reg)	\
+		(((num) & 0xFFF) << NUM_OFFSET |	\
+		 ((type) & 0xF) << TYPE_OFFSET |	\
+		 ((offset) & 0xFF) << BIT_OFFSET |	\
+		 ((width) & 0xF) << WIDTH_OFFSET |	\
+		 ((reg) & 0xF))
+
+#define SPRD_PINCTRL_PIN(pin)	SPRD_PINCTRL_PIN_DATA(pin, #pin)
+
+#define SPRD_PINCTRL_PIN_DATA(a, b)				\
+	{							\
+		.name = b,					\
+		.num = (((a) >> NUM_OFFSET) & 0xfff),		\
+		.type = (((a) >> TYPE_OFFSET) & 0xf),		\
+		.bit_offset = (((a) >> BIT_OFFSET) & 0xff),	\
+		.bit_width = ((a) >> WIDTH_OFFSET & 0xf),	\
+		.reg = ((a) & 0xf)				\
+	}
+
+enum pin_type {
+	GLOBAL_CTRL_PIN,
+	COMMON_PIN,
+	MISC_PIN,
+};
+
+struct sprd_pins_info {
+	const char *name;
+	unsigned int num;
+	enum pin_type type;
+
+	/* for global control pins configuration */
+	unsigned long bit_offset;
+	unsigned long bit_width;
+	unsigned int reg;
+};
+
+int sprd_pinctrl_core_probe(struct platform_device *pdev,
+			    struct sprd_pins_info *sprd_soc_pin_info,
+			    int pins_cnt);
+void sprd_pinctrl_remove(struct platform_device *pdev);
+void sprd_pinctrl_shutdown(struct platform_device *pdev);
+
+#endif /* __PINCTRL_SPRD_H__ */