Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 387 insertions, 0 deletions

diff --git a/sound/soc/codecs/cs4349.c b/sound/soc/codecs/cs4349.c
new file mode 100644
index 000000000..9a7f70175
--- /dev/null
+++ b/sound/soc/codecs/cs4349.c
@@ -0,0 +1,387 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * cs4349.c  --  CS4349 ALSA Soc Audio driver
+ *
+ * Copyright 2015 Cirrus Logic, Inc.
+ *
+ * Authors: Tim Howe <Tim.Howe@cirrus.com>
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+#include <sound/initval.h>
+#include <sound/tlv.h>
+#include "cs4349.h"
+
+
+static const struct reg_default cs4349_reg_defaults[] = {
+	{ 2, 0x00 },	/* r02	- Mode Control */
+	{ 3, 0x09 },	/* r03	- Volume, Mixing and Inversion Control */
+	{ 4, 0x81 },	/* r04	- Mute Control */
+	{ 5, 0x00 },	/* r05	- Channel A Volume Control */
+	{ 6, 0x00 },	/* r06	- Channel B Volume Control */
+	{ 7, 0xB1 },	/* r07	- Ramp and Filter Control */
+	{ 8, 0x1C },	/* r08	- Misc. Control */
+};
+
+/* Private data for the CS4349 */
+struct  cs4349_private {
+	struct regmap			*regmap;
+	struct gpio_desc		*reset_gpio;
+	unsigned int			mode;
+	int				rate;
+};
+
+static bool cs4349_readable_register(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case CS4349_CHIPID ... CS4349_MISC:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool cs4349_writeable_register(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case CS4349_MODE ...  CS4349_MISC:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static int cs4349_set_dai_fmt(struct snd_soc_dai *codec_dai,
+			      unsigned int format)
+{
+	struct snd_soc_component *component = codec_dai->component;
+	struct cs4349_private *cs4349 = snd_soc_component_get_drvdata(component);
+	unsigned int fmt;
+
+	fmt = format & SND_SOC_DAIFMT_FORMAT_MASK;
+
+	switch (fmt) {
+	case SND_SOC_DAIFMT_I2S:
+	case SND_SOC_DAIFMT_LEFT_J:
+	case SND_SOC_DAIFMT_RIGHT_J:
+		cs4349->mode = format & SND_SOC_DAIFMT_FORMAT_MASK;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int cs4349_pcm_hw_params(struct snd_pcm_substream *substream,
+			    struct snd_pcm_hw_params *params,
+			    struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+	struct cs4349_private *cs4349 = snd_soc_component_get_drvdata(component);
+	int fmt, ret;
+
+	cs4349->rate = params_rate(params);
+
+	switch (cs4349->mode) {
+	case SND_SOC_DAIFMT_I2S:
+		fmt = DIF_I2S;
+		break;
+	case SND_SOC_DAIFMT_LEFT_J:
+		fmt = DIF_LEFT_JST;
+		break;
+	case SND_SOC_DAIFMT_RIGHT_J:
+		switch (params_width(params)) {
+		case 16:
+			fmt = DIF_RGHT_JST16;
+			break;
+		case 24:
+			fmt = DIF_RGHT_JST24;
+			break;
+		default:
+			return -EINVAL;
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = snd_soc_component_update_bits(component, CS4349_MODE, DIF_MASK,
+				  MODE_FORMAT(fmt));
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int cs4349_mute(struct snd_soc_dai *dai, int mute, int direction)
+{
+	struct snd_soc_component *component = dai->component;
+	int reg;
+
+	reg = 0;
+	if (mute)
+		reg = MUTE_AB_MASK;
+
+	return snd_soc_component_update_bits(component, CS4349_MUTE, MUTE_AB_MASK, reg);
+}
+
+static DECLARE_TLV_DB_SCALE(dig_tlv, -12750, 50, 0);
+
+static const char * const chan_mix_texts[] = {
+	"Mute", "MuteA", "MuteA SwapB", "MuteA MonoB", "SwapA MuteB",
+	"BothR", "Swap", "SwapA MonoB", "MuteB", "Normal", "BothL",
+	"MonoB", "MonoA MuteB", "MonoA", "MonoA SwapB", "Mono",
+	/*Normal == Channel A = Left, Channel B = Right*/
+};
+
+static const char * const fm_texts[] = {
+	"Auto", "Single", "Double", "Quad",
+};
+
+static const char * const deemph_texts[] = {
+	"None", "44.1k", "48k", "32k",
+};
+
+static const char * const softr_zeroc_texts[] = {
+	"Immediate", "Zero Cross", "Soft Ramp", "SR on ZC",
+};
+
+static int deemph_values[] = {
+	0, 4, 8, 12,
+};
+
+static int softr_zeroc_values[] = {
+	0, 64, 128, 192,
+};
+
+static const struct soc_enum chan_mix_enum =
+	SOC_ENUM_SINGLE(CS4349_VMI, 0,
+			ARRAY_SIZE(chan_mix_texts),
+			chan_mix_texts);
+
+static const struct soc_enum fm_mode_enum =
+	SOC_ENUM_SINGLE(CS4349_MODE, 0,
+			ARRAY_SIZE(fm_texts),
+			fm_texts);
+
+static SOC_VALUE_ENUM_SINGLE_DECL(deemph_enum, CS4349_MODE, 0, DEM_MASK,
+				deemph_texts, deemph_values);
+
+static SOC_VALUE_ENUM_SINGLE_DECL(softr_zeroc_enum, CS4349_RMPFLT, 0,
+				SR_ZC_MASK, softr_zeroc_texts,
+				softr_zeroc_values);
+
+static const struct snd_kcontrol_new cs4349_snd_controls[] = {
+	SOC_DOUBLE_R_TLV("Master Playback Volume",
+			 CS4349_VOLA, CS4349_VOLB, 0, 0xFF, 1, dig_tlv),
+	SOC_ENUM("Functional Mode", fm_mode_enum),
+	SOC_ENUM("De-Emphasis Control", deemph_enum),
+	SOC_ENUM("Soft Ramp Zero Cross Control", softr_zeroc_enum),
+	SOC_ENUM("Channel Mixer", chan_mix_enum),
+	SOC_SINGLE("VolA = VolB Switch", CS4349_VMI, 7, 1, 0),
+	SOC_SINGLE("InvertA Switch", CS4349_VMI, 6, 1, 0),
+	SOC_SINGLE("InvertB Switch", CS4349_VMI, 5, 1, 0),
+	SOC_SINGLE("Auto-Mute Switch", CS4349_MUTE, 7, 1, 0),
+	SOC_SINGLE("MUTEC A = B Switch", CS4349_MUTE, 5, 1, 0),
+	SOC_SINGLE("Soft Ramp Up Switch", CS4349_RMPFLT, 5, 1, 0),
+	SOC_SINGLE("Soft Ramp Down Switch", CS4349_RMPFLT, 4, 1, 0),
+	SOC_SINGLE("Slow Roll Off Filter Switch", CS4349_RMPFLT, 2, 1, 0),
+	SOC_SINGLE("Freeze Switch", CS4349_MISC, 5, 1, 0),
+	SOC_SINGLE("Popguard Switch", CS4349_MISC, 4, 1, 0),
+};
+
+static const struct snd_soc_dapm_widget cs4349_dapm_widgets[] = {
+	SND_SOC_DAPM_DAC("HiFi DAC", NULL, SND_SOC_NOPM, 0, 0),
+
+	SND_SOC_DAPM_OUTPUT("OutputA"),
+	SND_SOC_DAPM_OUTPUT("OutputB"),
+};
+
+static const struct snd_soc_dapm_route cs4349_routes[] = {
+	{"DAC Playback", NULL, "OutputA"},
+	{"DAC Playback", NULL, "OutputB"},
+
+	{"OutputA", NULL, "HiFi DAC"},
+	{"OutputB", NULL, "HiFi DAC"},
+};
+
+#define CS4349_PCM_FORMATS (SNDRV_PCM_FMTBIT_S8  | SNDRV_PCM_FMTBIT_S16_LE  | \
+			SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S20_3LE | \
+			SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_LE  | \
+			SNDRV_PCM_FMTBIT_S32_LE)
+
+#define CS4349_PCM_RATES SNDRV_PCM_RATE_8000_192000
+
+static const struct snd_soc_dai_ops cs4349_dai_ops = {
+	.hw_params	= cs4349_pcm_hw_params,
+	.set_fmt	= cs4349_set_dai_fmt,
+	.mute_stream	= cs4349_mute,
+	.no_capture_mute = 1,
+};
+
+static struct snd_soc_dai_driver cs4349_dai = {
+	.name = "cs4349_hifi",
+	.playback = {
+		.stream_name	= "DAC Playback",
+		.channels_min	= 1,
+		.channels_max	= 2,
+		.rates		= CS4349_PCM_RATES,
+		.formats	= CS4349_PCM_FORMATS,
+	},
+	.ops = &cs4349_dai_ops,
+	.symmetric_rate = 1,
+};
+
+static const struct snd_soc_component_driver soc_component_dev_cs4349 = {
+	.controls		= cs4349_snd_controls,
+	.num_controls		= ARRAY_SIZE(cs4349_snd_controls),
+	.dapm_widgets		= cs4349_dapm_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(cs4349_dapm_widgets),
+	.dapm_routes		= cs4349_routes,
+	.num_dapm_routes	= ARRAY_SIZE(cs4349_routes),
+	.idle_bias_on		= 1,
+	.use_pmdown_time	= 1,
+	.endianness		= 1,
+};
+
+static const struct regmap_config cs4349_regmap = {
+	.reg_bits		= 8,
+	.val_bits		= 8,
+
+	.max_register		= CS4349_MISC,
+	.reg_defaults		= cs4349_reg_defaults,
+	.num_reg_defaults	= ARRAY_SIZE(cs4349_reg_defaults),
+	.readable_reg		= cs4349_readable_register,
+	.writeable_reg		= cs4349_writeable_register,
+	.cache_type		= REGCACHE_MAPLE,
+};
+
+static int cs4349_i2c_probe(struct i2c_client *client)
+{
+	struct cs4349_private *cs4349;
+	int ret;
+
+	cs4349 = devm_kzalloc(&client->dev, sizeof(*cs4349), GFP_KERNEL);
+	if (!cs4349)
+		return -ENOMEM;
+
+	cs4349->regmap = devm_regmap_init_i2c(client, &cs4349_regmap);
+	if (IS_ERR(cs4349->regmap)) {
+		ret = PTR_ERR(cs4349->regmap);
+		dev_err(&client->dev, "regmap_init() failed: %d\n", ret);
+		return ret;
+	}
+
+	/* Reset the Device */
+	cs4349->reset_gpio = devm_gpiod_get_optional(&client->dev,
+		"reset", GPIOD_OUT_LOW);
+	if (IS_ERR(cs4349->reset_gpio))
+		return PTR_ERR(cs4349->reset_gpio);
+
+	gpiod_set_value_cansleep(cs4349->reset_gpio, 1);
+
+	i2c_set_clientdata(client, cs4349);
+
+	return devm_snd_soc_register_component(&client->dev,
+		&soc_component_dev_cs4349,
+		&cs4349_dai, 1);
+}
+
+static void cs4349_i2c_remove(struct i2c_client *client)
+{
+	struct cs4349_private *cs4349 = i2c_get_clientdata(client);
+
+	/* Hold down reset */
+	gpiod_set_value_cansleep(cs4349->reset_gpio, 0);
+}
+
+static int cs4349_runtime_suspend(struct device *dev)
+{
+	struct cs4349_private *cs4349 = dev_get_drvdata(dev);
+	int ret;
+
+	ret = regmap_update_bits(cs4349->regmap, CS4349_MISC, PWR_DWN, PWR_DWN);
+	if (ret < 0)
+		return ret;
+
+	regcache_cache_only(cs4349->regmap, true);
+
+	/* Hold down reset */
+	gpiod_set_value_cansleep(cs4349->reset_gpio, 0);
+
+	return 0;
+}
+
+static int cs4349_runtime_resume(struct device *dev)
+{
+	struct cs4349_private *cs4349 = dev_get_drvdata(dev);
+	int ret;
+
+	ret = regmap_update_bits(cs4349->regmap, CS4349_MISC, PWR_DWN, 0);
+	if (ret < 0)
+		return ret;
+
+	gpiod_set_value_cansleep(cs4349->reset_gpio, 1);
+
+	regcache_cache_only(cs4349->regmap, false);
+	ret = regcache_sync(cs4349->regmap);
+	if (ret) {
+		regcache_cache_only(cs4349->regmap, true);
+		regcache_mark_dirty(cs4349->regmap);
+		gpiod_set_value_cansleep(cs4349->reset_gpio, 0);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops cs4349_runtime_pm = {
+	RUNTIME_PM_OPS(cs4349_runtime_suspend, cs4349_runtime_resume, NULL)
+};
+
+static const struct of_device_id cs4349_of_match[] = {
+	{ .compatible = "cirrus,cs4349", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, cs4349_of_match);
+
+static const struct i2c_device_id cs4349_i2c_id[] = {
+	{ .name = "cs4349" },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, cs4349_i2c_id);
+
+static struct i2c_driver cs4349_i2c_driver = {
+	.driver = {
+		.name		= "cs4349",
+		.of_match_table	= cs4349_of_match,
+		.pm = pm_ptr(&cs4349_runtime_pm),
+	},
+	.id_table	= cs4349_i2c_id,
+	.probe		= cs4349_i2c_probe,
+	.remove		= cs4349_i2c_remove,
+};
+
+module_i2c_driver(cs4349_i2c_driver);
+
+MODULE_AUTHOR("Tim Howe <tim.howe@cirrus.com>");
+MODULE_DESCRIPTION("Cirrus Logic CS4349 ALSA SoC Codec Driver");
+MODULE_LICENSE("GPL");