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, 423 insertions, 0 deletions

diff --git a/sound/soc/qcom/common.c b/sound/soc/qcom/common.c
new file mode 100644
index 000000000..d9f256d51
--- /dev/null
+++ b/sound/soc/qcom/common.c
@@ -0,0 +1,423 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018, Linaro Limited.
+// Copyright (c) 2018, The Linux Foundation. All rights reserved.
+
+#include <dt-bindings/sound/qcom,q6afe.h>
+#include <linux/module.h>
+#include <sound/jack.h>
+#include <linux/input-event-codes.h>
+#include "common.h"
+
+#define NAME_SIZE	32
+
+static const struct snd_soc_dapm_widget qcom_jack_snd_widgets[] = {
+	SND_SOC_DAPM_HP("Headphone Jack", NULL),
+	SND_SOC_DAPM_MIC("Mic Jack", NULL),
+	SND_SOC_DAPM_SPK("DP0 Jack", NULL),
+	SND_SOC_DAPM_SPK("DP1 Jack", NULL),
+	SND_SOC_DAPM_SPK("DP2 Jack", NULL),
+	SND_SOC_DAPM_SPK("DP3 Jack", NULL),
+	SND_SOC_DAPM_SPK("DP4 Jack", NULL),
+	SND_SOC_DAPM_SPK("DP5 Jack", NULL),
+	SND_SOC_DAPM_SPK("DP6 Jack", NULL),
+	SND_SOC_DAPM_SPK("DP7 Jack", NULL),
+};
+
+static struct device_node *qcom_snd_get_link_node(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
+	struct snd_soc_card *card = rtd->card;
+	struct of_phandle_args args;
+	int ret;
+
+	if (!card->dev || !card->dev->of_node)
+		return NULL;
+
+	for_each_available_child_of_node_scoped(card->dev->of_node, np) {
+		struct device_node *cpu_np __free(device_node) =
+			of_get_child_by_name(np, "cpu");
+
+		if (!cpu_np)
+			continue;
+
+		ret = of_parse_phandle_with_args(cpu_np, "sound-dai", "#sound-dai-cells", 0,
+						 &args);
+		if (ret)
+			continue;
+
+		if (args.np == rtd->dai_link->cpus[0].of_node &&
+		    args.args_count == 1 && args.args[0] == cpu_dai->id) {
+			of_node_put(args.np);
+			return of_node_get(np);
+		}
+
+		of_node_put(args.np);
+	}
+
+	return NULL;
+}
+
+static int qcom_snd_parse_tdm_slot(struct device_node *np,
+				   struct qcom_snd_tdm_slot_cfg *cfg)
+{
+	memset(cfg, 0, sizeof(*cfg));
+
+	return snd_soc_of_parse_tdm_slot(np, &cfg->tx_mask, &cfg->rx_mask,
+					 &cfg->slots, &cfg->slot_width);
+}
+
+static int qcom_snd_normalize_tdm_slots(struct qcom_snd_tdm_slot_cfg *cpu_cfg,
+					struct qcom_snd_tdm_slot_cfg *codec_cfg)
+{
+	unsigned int slots;
+	unsigned int slot_width;
+
+	if (cpu_cfg->slots && codec_cfg->slots && cpu_cfg->slots != codec_cfg->slots)
+		return -EINVAL;
+
+	if (cpu_cfg->slot_width && codec_cfg->slot_width &&
+	    cpu_cfg->slot_width != codec_cfg->slot_width)
+		return -EINVAL;
+
+	slots = cpu_cfg->slots ?: codec_cfg->slots;
+	if (!slots)
+		return 0;
+
+	slot_width = cpu_cfg->slot_width ?: codec_cfg->slot_width;
+	if (!slot_width)
+		return -EINVAL;
+
+	cpu_cfg->slots = slots;
+	codec_cfg->slots = slots;
+	cpu_cfg->slot_width = slot_width;
+	codec_cfg->slot_width = slot_width;
+
+	return 0;
+}
+
+static int qcom_snd_parse_dai_tdm_slots(struct snd_soc_pcm_runtime *rtd,
+					struct qcom_snd_tdm_slot_cfg *cpu_cfg,
+					struct qcom_snd_tdm_slot_cfg *codec_cfg)
+{
+	struct device_node *link_np __free(device_node) = qcom_snd_get_link_node(rtd);
+	int ret;
+
+	if (!link_np)
+		return -ENOENT;
+
+	struct device_node *cpu_np __free(device_node) =
+		of_get_child_by_name(link_np, "cpu");
+	struct device_node *codec_np __free(device_node) =
+		of_get_child_by_name(link_np, "codec");
+	if (!cpu_np || !codec_np)
+		return -ENOENT;
+
+	ret = qcom_snd_parse_tdm_slot(cpu_np, cpu_cfg);
+	if (ret)
+		return ret;
+
+	return qcom_snd_parse_tdm_slot(codec_np, codec_cfg);
+}
+
+int qcom_snd_get_dai_tdm_slots(struct snd_soc_pcm_runtime *rtd,
+			       struct qcom_snd_tdm_slot_cfg *cpu_cfg,
+			       struct qcom_snd_tdm_slot_cfg *codec_cfg)
+{
+	int ret;
+
+	ret = qcom_snd_parse_dai_tdm_slots(rtd, cpu_cfg, codec_cfg);
+	if (ret)
+		return ret;
+
+	return qcom_snd_normalize_tdm_slots(cpu_cfg, codec_cfg);
+}
+EXPORT_SYMBOL_GPL(qcom_snd_get_dai_tdm_slots);
+
+int qcom_snd_apply_dai_tdm_slots_cfg(struct snd_soc_pcm_runtime *rtd,
+				     const struct qcom_snd_tdm_slot_cfg *cpu_cfg,
+				     const struct qcom_snd_tdm_slot_cfg *codec_cfg)
+{
+	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
+	struct snd_soc_dai *codec_dai;
+	int i;
+	int ret;
+
+	if (!cpu_cfg->slots)
+		return 0;
+
+	ret = snd_soc_dai_set_tdm_slot(cpu_dai, cpu_cfg->tx_mask, cpu_cfg->rx_mask,
+				       cpu_cfg->slots, cpu_cfg->slot_width);
+	if (ret)
+		return ret;
+
+	for_each_rtd_codec_dais(rtd, i, codec_dai) {
+		ret = snd_soc_dai_set_tdm_slot(codec_dai,
+					       codec_cfg->tx_mask,
+					       codec_cfg->rx_mask,
+					       codec_cfg->slots,
+					       codec_cfg->slot_width);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(qcom_snd_apply_dai_tdm_slots_cfg);
+
+int qcom_snd_apply_dai_tdm_slots(struct snd_soc_pcm_runtime *rtd)
+{
+	struct qcom_snd_tdm_slot_cfg cpu_cfg;
+	struct qcom_snd_tdm_slot_cfg codec_cfg;
+	int ret;
+
+	ret = qcom_snd_get_dai_tdm_slots(rtd, &cpu_cfg, &codec_cfg);
+	if (ret)
+		return ret == -ENOENT ? 0 : ret;
+
+	return qcom_snd_apply_dai_tdm_slots_cfg(rtd, &cpu_cfg, &codec_cfg);
+}
+EXPORT_SYMBOL_GPL(qcom_snd_apply_dai_tdm_slots);
+
+int qcom_snd_parse_of(struct snd_soc_card *card)
+{
+	struct device *dev = card->dev;
+	struct snd_soc_dai_link *link;
+	struct of_phandle_args args;
+	struct snd_soc_dai_link_component *dlc;
+	int ret, num_links;
+
+	ret = snd_soc_of_parse_card_name(card, "model");
+	if (ret == 0 && !card->name)
+		/* Deprecated, only for compatibility with old device trees */
+		ret = snd_soc_of_parse_card_name(card, "qcom,model");
+	if (ret) {
+		dev_err(dev, "Error parsing card name: %d\n", ret);
+		return ret;
+	}
+
+	if (of_property_present(dev->of_node, "widgets")) {
+		ret = snd_soc_of_parse_audio_simple_widgets(card, "widgets");
+		if (ret)
+			return ret;
+	}
+
+	/* DAPM routes */
+	if (of_property_present(dev->of_node, "audio-routing")) {
+		ret = snd_soc_of_parse_audio_routing(card, "audio-routing");
+		if (ret)
+			return ret;
+	}
+	/* Deprecated, only for compatibility with old device trees */
+	if (of_property_present(dev->of_node, "qcom,audio-routing")) {
+		ret = snd_soc_of_parse_audio_routing(card, "qcom,audio-routing");
+		if (ret)
+			return ret;
+	}
+
+	ret = snd_soc_of_parse_pin_switches(card, "pin-switches");
+	if (ret)
+		return ret;
+
+	ret = snd_soc_of_parse_aux_devs(card, "aux-devs");
+	if (ret)
+		return ret;
+
+	/* Populate links */
+	num_links = of_get_available_child_count(dev->of_node);
+
+	/* Allocate the DAI link array */
+	card->dai_link = devm_kcalloc(dev, num_links, sizeof(*link), GFP_KERNEL);
+	if (!card->dai_link)
+		return -ENOMEM;
+
+	card->num_links = num_links;
+	link = card->dai_link;
+
+	for_each_available_child_of_node_scoped(dev->of_node, np) {
+		dlc = devm_kcalloc(dev, 2, sizeof(*dlc), GFP_KERNEL);
+		if (!dlc)
+			return -ENOMEM;
+
+		link->cpus	= &dlc[0];
+		link->platforms	= &dlc[1];
+
+		link->num_cpus		= 1;
+		link->num_platforms	= 1;
+
+		ret = of_property_read_string(np, "link-name", &link->name);
+		if (ret) {
+			dev_err(dev, "error getting codec dai_link name\n");
+			return ret;
+		}
+
+		struct device_node *cpu __free(device_node) =
+			of_get_child_by_name(np, "cpu");
+		struct device_node *platform __free(device_node) =
+			of_get_child_by_name(np, "platform");
+		struct device_node *codec __free(device_node) =
+			of_get_child_by_name(np, "codec");
+
+		if (!cpu) {
+			dev_err(dev, "%s: Can't find cpu DT node\n", link->name);
+			return -EINVAL;
+		}
+
+		ret = snd_soc_of_get_dlc(cpu, &args, link->cpus, 0);
+		if (ret) {
+			dev_err_probe(dev, ret,
+				      "%s: error getting cpu dai name\n", link->name);
+			return ret;
+		}
+
+		link->id = args.args[0];
+
+		if (link->id >= LPASS_MAX_PORT) {
+			dev_err(dev, "%s: Invalid cpu dai id %d\n", link->name, link->id);
+			return -EINVAL;
+		}
+
+		if (platform) {
+			link->platforms->of_node = of_parse_phandle(platform,
+					"sound-dai",
+					0);
+			if (!link->platforms->of_node) {
+				dev_err(dev, "%s: platform dai not found\n", link->name);
+				return -EINVAL;
+			}
+		} else {
+			link->platforms->of_node = link->cpus->of_node;
+		}
+
+		if (codec) {
+			ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
+			if (ret < 0) {
+				dev_err_probe(dev, ret,
+					      "%s: codec dai not found\n", link->name);
+				return ret;
+			}
+
+			if (platform) {
+				/* DPCM backend */
+				link->no_pcm = 1;
+				link->ignore_pmdown_time = 1;
+			}
+		} else {
+			/* DPCM frontend */
+			link->codecs	 = &snd_soc_dummy_dlc;
+			link->num_codecs = 1;
+			link->dynamic = 1;
+		}
+
+		if (platform || !codec) {
+			/* DPCM */
+			link->ignore_suspend = 1;
+			link->nonatomic = 1;
+		}
+
+		link->stream_name = link->name;
+		link++;
+	}
+
+	if (!card->dapm_widgets) {
+		card->dapm_widgets = qcom_jack_snd_widgets;
+		card->num_dapm_widgets = ARRAY_SIZE(qcom_jack_snd_widgets);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(qcom_snd_parse_of);
+
+static struct snd_soc_jack_pin qcom_headset_jack_pins[] = {
+	/* Headset */
+	{
+		.pin = "Mic Jack",
+		.mask = SND_JACK_MICROPHONE,
+	},
+	{
+		.pin = "Headphone Jack",
+		.mask = SND_JACK_HEADPHONE,
+	},
+};
+
+int qcom_snd_wcd_jack_setup(struct snd_soc_pcm_runtime *rtd,
+			    struct snd_soc_jack *jack, bool *jack_setup)
+{
+	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
+	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
+	struct snd_soc_card *card = rtd->card;
+	int rval, i;
+
+	if (!*jack_setup) {
+		rval = snd_soc_card_jack_new_pins(card, "Headset Jack",
+					     SND_JACK_HEADSET | SND_JACK_LINEOUT |
+					     SND_JACK_MECHANICAL |
+					     SND_JACK_BTN_0 | SND_JACK_BTN_1 |
+					     SND_JACK_BTN_2 | SND_JACK_BTN_3 |
+					     SND_JACK_BTN_4 | SND_JACK_BTN_5,
+					     jack, qcom_headset_jack_pins,
+					     ARRAY_SIZE(qcom_headset_jack_pins));
+
+		if (rval < 0) {
+			dev_err(card->dev, "Unable to add Headphone Jack\n");
+			return rval;
+		}
+
+		snd_jack_set_key(jack->jack, SND_JACK_BTN_0, KEY_MEDIA);
+		snd_jack_set_key(jack->jack, SND_JACK_BTN_1, KEY_VOICECOMMAND);
+		snd_jack_set_key(jack->jack, SND_JACK_BTN_2, KEY_VOLUMEUP);
+		snd_jack_set_key(jack->jack, SND_JACK_BTN_3, KEY_VOLUMEDOWN);
+		*jack_setup = true;
+	}
+
+	switch (cpu_dai->id) {
+	case LPI_MI2S_RX_0:
+	case TX_CODEC_DMA_TX_0:
+	case TX_CODEC_DMA_TX_1:
+	case TX_CODEC_DMA_TX_2:
+	case TX_CODEC_DMA_TX_3:
+		for_each_rtd_codec_dais(rtd, i, codec_dai) {
+			rval = snd_soc_component_set_jack(codec_dai->component,
+							  jack, NULL);
+			if (rval != 0 && rval != -ENOTSUPP) {
+				dev_warn(card->dev, "Failed to set jack: %d\n", rval);
+				return rval;
+			}
+		}
+
+		break;
+	default:
+		break;
+	}
+
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(qcom_snd_wcd_jack_setup);
+
+int qcom_snd_dp_jack_setup(struct snd_soc_pcm_runtime *rtd,
+			   struct snd_soc_jack *dp_jack, int dp_pcm_id)
+{
+	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
+	struct snd_soc_card *card = rtd->card;
+	char jack_name[NAME_SIZE];
+	int rval, i;
+
+	snprintf(jack_name, sizeof(jack_name), "DP%d Jack", dp_pcm_id);
+	rval = snd_soc_card_jack_new(card, jack_name, SND_JACK_AVOUT, dp_jack);
+	if (rval)
+		return rval;
+
+	for_each_rtd_codec_dais(rtd, i, codec_dai) {
+		rval = snd_soc_component_set_jack(codec_dai->component, dp_jack, NULL);
+		if (rval != 0 && rval != -ENOTSUPP) {
+			dev_warn(card->dev, "Failed to set jack: %d\n", rval);
+			return rval;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(qcom_snd_dp_jack_setup);
+
+MODULE_DESCRIPTION("ASoC Qualcomm helper functions");
+MODULE_LICENSE("GPL");