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, 87 insertions, 0 deletions

diff --git a/sound/hda/codecs/ca0110.c b/sound/hda/codecs/ca0110.c
new file mode 100644
index 000000000..d17fc3878
--- /dev/null
+++ b/sound/hda/codecs/ca0110.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * HD audio codec driver for Creative X-Fi CA0110-IBG chip
+ *
+ * Copyright (c) 2008 Takashi Iwai <tiwai@suse.de>
+ */
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/hda_codec.h>
+#include "hda_local.h"
+#include "hda_auto_parser.h"
+#include "hda_jack.h"
+#include "generic.h"
+
+static int ca0110_parse_auto_config(struct hda_codec *codec)
+{
+	struct hda_gen_spec *spec = codec->spec;
+	int err;
+
+	err = snd_hda_parse_pin_defcfg(codec, &spec->autocfg, NULL, 0);
+	if (err < 0)
+		return err;
+	err = snd_hda_gen_parse_auto_config(codec, &spec->autocfg);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+
+static int ca0110_probe(struct hda_codec *codec, const struct hda_device_id *id)
+{
+	struct hda_gen_spec *spec;
+	int err;
+
+	spec = kzalloc_obj(*spec);
+	if (!spec)
+		return -ENOMEM;
+	snd_hda_gen_spec_init(spec);
+	codec->spec = spec;
+
+	spec->multi_cap_vol = 1;
+	codec->bus->core.needs_damn_long_delay = 1;
+
+	err = ca0110_parse_auto_config(codec);
+	if (err < 0)
+		goto error;
+
+	return 0;
+
+ error:
+	snd_hda_gen_remove(codec);
+	return err;
+}
+
+
+static const struct hda_codec_ops ca0110_codec_ops = {
+	.probe = ca0110_probe,
+	.remove = snd_hda_gen_remove,
+	.build_controls = snd_hda_gen_build_controls,
+	.build_pcms = snd_hda_gen_build_pcms,
+	.init = snd_hda_gen_init,
+	.unsol_event = snd_hda_jack_unsol_event,
+};
+
+/*
+ * driver entries
+ */
+static const struct hda_device_id snd_hda_id_ca0110[] = {
+	HDA_CODEC_ID(0x1102000a, "CA0110-IBG"),
+	HDA_CODEC_ID(0x1102000b, "CA0110-IBG"),
+	HDA_CODEC_ID(0x1102000d, "SB0880 X-Fi"),
+	{} /* terminator */
+};
+MODULE_DEVICE_TABLE(hdaudio, snd_hda_id_ca0110);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Creative CA0110-IBG HD-audio codec");
+
+static struct hda_codec_driver ca0110_driver = {
+	.id = snd_hda_id_ca0110,
+	.ops = &ca0110_codec_ops,
+};
+
+module_hda_codec_driver(ca0110_driver);