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, 214 insertions, 0 deletions

diff --git a/sound/soc/codecs/rt274.h b/sound/soc/codecs/rt274.h
new file mode 100644
index 000000000..0fcf942fa
--- /dev/null
+++ b/sound/soc/codecs/rt274.h
@@ -0,0 +1,214 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * rt274.h  --  RT274 ALSA SoC audio driver
+ *
+ * Copyright 2016 Realtek Microelectronics
+ * Author: Bard Liao <bardliao@realtek.com>
+ */
+
+#ifndef __RT274_H__
+#define __RT274_H__
+
+#define VERB_CMD(V, N, D) ((N << 20) | (V << 8) | D)
+
+#define RT274_AUDIO_FUNCTION_GROUP			0x01
+#define RT274_DAC_OUT0					0x02
+#define RT274_DAC_OUT1					0x03
+#define RT274_ADC_IN2					0x08
+#define RT274_ADC_IN1					0x09
+#define RT274_DIG_CVT					0x0a
+#define RT274_DMIC1					0x12
+#define RT274_DMIC2					0x13
+#define RT274_MIC					0x19
+#define RT274_LINE1					0x1a
+#define RT274_LINE2					0x1b
+#define RT274_LINE3					0x16
+#define RT274_SPDIF					0x1e
+#define RT274_VENDOR_REGISTERS				0x20
+#define RT274_HP_OUT					0x21
+#define RT274_MIXER_IN1					0x22
+#define RT274_MIXER_IN2					0x23
+#define RT274_INLINE_CMD				0x55
+
+#define RT274_SET_PIN_SFT				6
+#define RT274_SET_PIN_ENABLE				0x40
+#define RT274_SET_PIN_DISABLE				0
+#define RT274_SET_EAPD_HIGH				0x2
+#define RT274_SET_EAPD_LOW				0
+
+#define RT274_MUTE_SFT					7
+
+/* Verb commands */
+#define RT274_RESET\
+	VERB_CMD(AC_VERB_SET_CODEC_RESET, RT274_AUDIO_FUNCTION_GROUP, 0)
+#define RT274_GET_PARAM(NID, PARAM) VERB_CMD(AC_VERB_PARAMETERS, NID, PARAM)
+#define RT274_SET_POWER(NID) VERB_CMD(AC_VERB_SET_POWER_STATE, NID, 0)
+#define RT274_SET_AUDIO_POWER RT274_SET_POWER(RT274_AUDIO_FUNCTION_GROUP)
+#define RT274_SET_HPO_POWER RT274_SET_POWER(RT274_HP_OUT)
+#define RT274_SET_DMIC1_POWER RT274_SET_POWER(RT274_DMIC1)
+#define RT274_LOUT_MUX\
+	VERB_CMD(AC_VERB_SET_CONNECT_SEL, RT274_LINE3, 0)
+#define RT274_HPO_MUX\
+	VERB_CMD(AC_VERB_SET_CONNECT_SEL, RT274_HP_OUT, 0)
+#define RT274_ADC0_MUX\
+	VERB_CMD(AC_VERB_SET_CONNECT_SEL, RT274_MIXER_IN1, 0)
+#define RT274_ADC1_MUX\
+	VERB_CMD(AC_VERB_SET_CONNECT_SEL, RT274_MIXER_IN2, 0)
+#define RT274_SET_MIC\
+	VERB_CMD(AC_VERB_SET_PIN_WIDGET_CONTROL, RT274_MIC, 0)
+#define RT274_SET_PIN_LOUT3\
+	VERB_CMD(AC_VERB_SET_PIN_WIDGET_CONTROL, RT274_LINE3, 0)
+#define RT274_SET_PIN_HPO\
+	VERB_CMD(AC_VERB_SET_PIN_WIDGET_CONTROL, RT274_HP_OUT, 0)
+#define RT274_SET_PIN_DMIC1\
+	VERB_CMD(AC_VERB_SET_PIN_WIDGET_CONTROL, RT274_DMIC1, 0)
+#define RT274_SET_PIN_SPDIF\
+	VERB_CMD(AC_VERB_SET_PIN_WIDGET_CONTROL, RT274_SPDIF, 0)
+#define RT274_SET_PIN_DIG_CVT\
+	VERB_CMD(AC_VERB_SET_DIGI_CONVERT_1, RT274_DIG_CVT, 0)
+#define RT274_SET_AMP_GAIN_HPO\
+	VERB_CMD(AC_VERB_SET_AMP_GAIN_MUTE, RT274_HP_OUT, 0)
+#define RT274_SET_AMP_GAIN_ADC_IN1\
+	VERB_CMD(AC_VERB_SET_AMP_GAIN_MUTE, RT274_ADC_IN1, 0)
+#define RT274_SET_AMP_GAIN_ADC_IN2\
+	VERB_CMD(AC_VERB_SET_AMP_GAIN_MUTE, RT274_ADC_IN2, 0)
+#define RT274_GET_HP_SENSE\
+	VERB_CMD(AC_VERB_GET_PIN_SENSE, RT274_HP_OUT, 0)
+#define RT274_GET_MIC_SENSE\
+	VERB_CMD(AC_VERB_GET_PIN_SENSE, RT274_MIC, 0)
+#define RT274_SET_DMIC2_DEFAULT\
+	VERB_CMD(AC_VERB_SET_CONFIG_DEFAULT_BYTES_3, RT274_DMIC2, 0)
+#define RT274_SET_SPDIF_DEFAULT\
+	VERB_CMD(AC_VERB_SET_CONFIG_DEFAULT_BYTES_3, RT274_SPDIF, 0)
+#define RT274_DAC0L_GAIN\
+	VERB_CMD(AC_VERB_SET_AMP_GAIN_MUTE, RT274_DAC_OUT0, 0xa000)
+#define RT274_DAC0R_GAIN\
+	VERB_CMD(AC_VERB_SET_AMP_GAIN_MUTE, RT274_DAC_OUT0, 0x9000)
+#define RT274_DAC1L_GAIN\
+	VERB_CMD(AC_VERB_SET_AMP_GAIN_MUTE, RT274_DAC_OUT1, 0xa000)
+#define RT274_DAC1R_GAIN\
+	VERB_CMD(AC_VERB_SET_AMP_GAIN_MUTE, RT274_DAC_OUT1, 0x9000)
+#define RT274_ADCL_GAIN\
+	VERB_CMD(AC_VERB_SET_AMP_GAIN_MUTE, RT274_ADC_IN1, 0x6000)
+#define RT274_ADCR_GAIN\
+	VERB_CMD(AC_VERB_SET_AMP_GAIN_MUTE, RT274_ADC_IN1, 0x5000)
+#define RT274_MIC_GAIN\
+	VERB_CMD(AC_VERB_SET_AMP_GAIN_MUTE, RT274_MIC, 0x7000)
+#define RT274_LOUTL_GAIN\
+	VERB_CMD(AC_VERB_SET_AMP_GAIN_MUTE, RT274_LINE3, 0xa000)
+#define RT274_LOUTR_GAIN\
+	VERB_CMD(AC_VERB_SET_AMP_GAIN_MUTE, RT274_LINE3, 0x9000)
+#define RT274_HPOL_GAIN\
+	VERB_CMD(AC_VERB_SET_AMP_GAIN_MUTE, RT274_HP_OUT, 0xa000)
+#define RT274_HPOR_GAIN\
+	VERB_CMD(AC_VERB_SET_AMP_GAIN_MUTE, RT274_HP_OUT, 0x9000)
+#define RT274_DAC_FORMAT\
+	VERB_CMD(AC_VERB_SET_STREAM_FORMAT, RT274_DAC_OUT0, 0)
+#define RT274_ADC_FORMAT\
+	VERB_CMD(AC_VERB_SET_STREAM_FORMAT, RT274_ADC_IN1, 0)
+#define RT274_COEF_INDEX\
+	VERB_CMD(AC_VERB_SET_COEF_INDEX, RT274_VENDOR_REGISTERS, 0)
+#define RT274_PROC_COEF\
+	VERB_CMD(AC_VERB_SET_PROC_COEF, RT274_VENDOR_REGISTERS, 0)
+#define RT274_UNSOLICITED_INLINE_CMD\
+	VERB_CMD(AC_VERB_SET_UNSOLICITED_ENABLE, RT274_INLINE_CMD, 0)
+#define RT274_UNSOLICITED_HP_OUT\
+	VERB_CMD(AC_VERB_SET_UNSOLICITED_ENABLE, RT274_HP_OUT, 0)
+#define RT274_UNSOLICITED_MIC\
+	VERB_CMD(AC_VERB_SET_UNSOLICITED_ENABLE, RT274_MIC, 0)
+#define RT274_COEF58_INDEX\
+	VERB_CMD(AC_VERB_SET_COEF_INDEX, 0x58, 0)
+#define RT274_COEF58_COEF\
+	VERB_CMD(AC_VERB_SET_PROC_COEF, 0x58, 0)
+#define RT274_COEF5b_INDEX\
+	VERB_CMD(AC_VERB_SET_COEF_INDEX, 0x5b, 0)
+#define RT274_COEF5b_COEF\
+	VERB_CMD(AC_VERB_SET_PROC_COEF, 0x5b, 0)
+#define RT274_SET_STREAMID_DAC0\
+	VERB_CMD(AC_VERB_SET_CHANNEL_STREAMID, RT274_DAC_OUT0, 0)
+#define RT274_SET_STREAMID_DAC1\
+	VERB_CMD(AC_VERB_SET_CHANNEL_STREAMID, RT274_DAC_OUT1, 0)
+#define RT274_SET_STREAMID_ADC1\
+	VERB_CMD(AC_VERB_SET_CHANNEL_STREAMID, RT274_ADC_IN1, 0)
+#define RT274_SET_STREAMID_ADC2\
+	VERB_CMD(AC_VERB_SET_CHANNEL_STREAMID, RT274_ADC_IN2, 0)
+
+/* Index registers */
+#define RT274_EAPD_GPIO_IRQ_CTRL	0x10
+#define RT274_PAD_CTRL12		0x35
+#define RT274_I2S_CTRL1			0x63
+#define RT274_I2S_CTRL2			0x64
+#define RT274_MCLK_CTRL			0x71
+#define RT274_CLK_CTRL			0x72
+#define RT274_PLL2_CTRL			0x7b
+
+
+/* EAPD GPIO IRQ control (Index 0x10) */
+#define RT274_IRQ_DIS		(0x0 << 13)
+#define RT274_IRQ_EN		(0x1 << 13)
+#define RT274_IRQ_CLR		(0x1 << 12)
+#define RT274_GPI2_SEL_MASK	(0x3 << 7)
+#define RT274_GPI2_SEL_GPIO2	(0x0 << 7)
+#define RT274_GPI2_SEL_I2S	(0x1 << 7)
+#define RT274_GPI2_SEL_DMIC_CLK	(0x2 << 7)
+#define RT274_GPI2_SEL_CBJ	(0x3 << 7)
+
+/* Front I2S_Interface control 1 (Index 0x63) */
+#define RT274_I2S_MODE_MASK	(0x1 << 11)
+#define RT274_I2S_MODE_S	(0x0 << 11)
+#define RT274_I2S_MODE_M	(0x1 << 11)
+#define RT274_TDM_DIS		(0x0 << 10)
+#define RT274_TDM_EN		(0x1 << 10)
+#define RT274_TDM_CH_NUM	(0x1 << 7)
+#define RT274_TDM_2CH		(0x0 << 7)
+#define RT274_TDM_4CH		(0x1 << 7)
+#define RT274_I2S_FMT_MASK	(0x3 << 8)
+#define RT274_I2S_FMT_I2S	(0x0 << 8)
+#define RT274_I2S_FMT_LJ	(0x1 << 8)
+#define RT274_I2S_FMT_PCMA	(0x2 << 8)
+#define RT274_I2S_FMT_PCMB	(0x3 << 8)
+
+/* MCLK clock domain control (Index 0x71) */
+#define RT274_MCLK_MODE_MASK	(0x1 << 14)
+#define RT274_MCLK_MODE_DIS	(0x0 << 14)
+#define RT274_MCLK_MODE_EN	(0x1 << 14)
+
+/* Clock control (Index 0x72) */
+#define RT274_CLK_SRC_MASK	(0x7 << 3)
+#define RT274_CLK_SRC_MCLK	(0x0 << 3)
+#define RT274_CLK_SRC_PLL2	(0x3 << 3)
+
+/* PLL2 control (Index 0x7b) */
+#define RT274_PLL2_SRC_MASK	(0x1 << 13)
+#define RT274_PLL2_SRC_MCLK	(0x0 << 13)
+#define RT274_PLL2_SRC_BCLK	(0x1 << 13)
+
+/* HP-OUT (0x21) */
+#define RT274_M_HP_MUX_SFT	14
+#define RT274_HP_SEL_MASK	0x1
+#define RT274_HP_SEL_SFT	0
+#define RT274_HP_SEL_F		0
+#define RT274_HP_SEL_S		1
+
+/* ADC (0x22) (0x23) */
+#define RT274_ADC_SEL_MASK	0x7
+#define RT274_ADC_SEL_SFT	0
+#define RT274_ADC_SEL_MIC	0
+#define RT274_ADC_SEL_LINE1	1
+#define RT274_ADC_SEL_LINE2	2
+#define RT274_ADC_SEL_DMIC	3
+
+#define RT274_SCLK_S_MCLK	0
+#define RT274_SCLK_S_PLL1	1
+#define RT274_SCLK_S_PLL2	2
+
+#define RT274_PLL2_S_MCLK	0
+#define RT274_PLL2_S_BCLK	1
+
+enum {
+	RT274_AIF1,
+	RT274_AIFS,
+};
+
+#endif /* __RT274_H__ */
+