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, 140 insertions, 0 deletions

diff --git a/sound/soc/codecs/rt766-sdca.h b/sound/soc/codecs/rt766-sdca.h
new file mode 100644
index 000000000..de4064007
--- /dev/null
+++ b/sound/soc/codecs/rt766-sdca.h
@@ -0,0 +1,140 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * rt766-sdca.h -- RT766 SDCA ALSA SoC audio driver header
+ *
+ * Copyright(c) 2026 Realtek Semiconductor Corp.
+ */
+
+#ifndef __RT766_H__
+#define __RT766_H__
+
+#include <linux/hid.h>
+#include <linux/pm.h>
+#include <linux/regmap.h>
+#include <linux/soundwire/sdw.h>
+#include <linux/soundwire/sdw_type.h>
+#include <sound/soc.h>
+#include <linux/workqueue.h>
+
+struct  rt766_sdca_priv {
+	struct regmap *regmap;
+	struct snd_soc_component *component;
+	struct sdw_slave *slave;
+	bool hw_init;
+	bool first_hw_init;
+	struct snd_soc_jack *hs_jack;
+	struct mutex disable_irq_lock; /* SDCA irq lock protection */
+	bool disable_irq;
+	int jack_type;
+	bool fu41_dapm_mute;
+	bool fu41_mixer_l_mute;
+	bool fu41_mixer_r_mute;
+	bool fu113_dapm_mute;
+	bool fu113_mixer_mute[4];
+	bool fu21_dapm_mute;
+	bool fu21_mixer_l_mute;
+	bool fu21_mixer_r_mute;
+	bool fu36_dapm_mute;
+	bool fu36_mixer_l_mute;
+	bool fu36_mixer_r_mute;
+	struct sdca_function_data *uaj_func_data;
+	struct sdca_function_data *sm_func_data;
+	struct sdca_function_data *sa_func_data;
+	struct sdca_function_data *hid_func_data;
+	struct sdca_interrupt_info *irq_info;
+	struct hid_device *hid;
+};
+
+/* vendor registers */
+#define RT766_VERSION_ID	0xc404
+#define RT766_DEV_ID1		0xc405
+#define RT766_DEV_ID0		0xc406
+#define RT766_BOND_LATCH_ID	0xc407
+
+#define RT766_HP_POWER_STATE		0x1000004
+#define RT766_HP_FSM_CTL2_1		0x100000d
+
+/* MCU Patch address */
+#define RT766_MCU_PATCH_ADDR1_START	0x10010000
+#define RT766_MCU_PATCH_ADDR1_END	0x10011fff
+#define RT766_MCU_PATCH_ADDR2_START	0x10020000
+#define RT766_MCU_PATCH_ADDR2_END	0x10023fff
+
+/* Buffer address for HID */
+#define RT766_BUF_ADDR_HID1	0x44030000
+#define RT766_BUF_ADDR_HID2	0x44030020
+
+/* SDCA (Channel) */
+#define RT766_CH_1	0x01
+#define RT766_CH_2	0x02
+#define RT766_CH_3	0x03
+#define RT766_CH_4	0x04
+
+/* RT766 SDCA Control - function number */
+#define RT766_FUNC_NUM_UAJ 0x01
+#define RT766_FUNC_NUM_MIC 0x02
+#define RT766_FUNC_NUM_HID 0x03
+#define RT766_FUNC_NUM_AMP 0x04
+
+/* RT766 SDCA entity */
+#define RT766_SDCA_ENT_0		0x00
+#define RT766_SDCA_ENT_HID101		0x01
+#define RT766_SDCA_ENT_GE49		0x49
+#define RT766_SDCA_ENT_USER_FU41	0x05
+#define RT766_SDCA_ENT_USER_FU36	0x0f
+#define RT766_SDCA_ENT_USER_FU21	0x03
+#define RT766_SDCA_ENT_USER_FU113	0x30
+#define RT766_SDCA_ENT_PDE23		0x33
+#define RT766_SDCA_ENT_PDE47		0x28
+#define RT766_SDCA_ENT_PDE11		0x2a
+#define RT766_SDCA_ENT_PDE34		0x29
+#define RT766_SDCA_ENT_CS41		0x01
+#define RT766_SDCA_ENT_CS36		0x11
+#define RT766_SDCA_ENT_CS113		0x12
+#define RT766_SDCA_ENT_CS21		0x21
+#define RT766_SDCA_ENT_PLATFORM_FU33	0x44
+#define RT766_SDCA_ENT_PPU21		0x04
+
+/* sample frequency index */
+#define RT766_SDCA_RATE_44100HZ		0x08
+#define RT766_SDCA_RATE_48000HZ		0x09
+#define RT766_SDCA_RATE_96000HZ		0x0b
+#define RT766_SDCA_RATE_192000HZ	0x0d
+
+/* SDCA Register macros */
+#define RT766_MUTE_REG(func, fu, ch) \
+	SDW_SDCA_CTL(RT766_FUNC_NUM_##func, RT766_SDCA_ENT_##fu, SDCA_CTL_FU_MUTE, RT766_CH_##ch)
+
+#define RT766_VOLUME_REG(func, fu, ch) \
+	SDW_SDCA_CTL(RT766_FUNC_NUM_##func, RT766_SDCA_ENT_##fu, SDCA_CTL_FU_CHANNEL_VOLUME, RT766_CH_##ch)
+
+#define RT766_GAIN_REG(func, fu, ch) \
+	SDW_SDCA_CTL(RT766_FUNC_NUM_##func, RT766_SDCA_ENT_##fu, SDCA_CTL_FU_GAIN, RT766_CH_##ch)
+
+#define RT766_PDE_REQ_REG(func, pde) \
+	SDW_SDCA_CTL(RT766_FUNC_NUM_##func, RT766_SDCA_ENT_##pde, SDCA_CTL_PDE_REQUESTED_PS, 0)
+
+#define RT766_PDE_ACTUAL_REG(func, pde) \
+	SDW_SDCA_CTL(RT766_FUNC_NUM_##func, RT766_SDCA_ENT_##pde, SDCA_CTL_PDE_ACTUAL_PS, 0)
+
+#define RT766_FUNC_STATUS_REG(func) \
+	SDW_SDCA_CTL(RT766_FUNC_NUM_##func, RT766_SDCA_ENT_0, SDCA_CTL_ENTITY_0_FUNCTION_STATUS, 0)
+
+#define RT766_SDCA_CTL(func, ent, ctl) \
+	SDW_SDCA_CTL(RT766_FUNC_NUM_##func, RT766_SDCA_ENT_##ent, ctl, 0)
+
+enum {
+	RT766_AIF1,
+	RT766_AIF2,
+	RT766_AIF3,
+};
+
+enum {
+	RT766_DAI_UAJ,
+	RT766_DAI_AMP,
+	RT766_DAI_MIC,
+};
+
+int rt766_sdca_io_init(struct device *dev, struct sdw_slave *slave);
+int rt766_sdca_init(struct device *dev, struct regmap *regmap, struct sdw_slave *slave);
+#endif /* __RT766_H__ */