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, 16 insertions, 0 deletions

diff --git a/sound/soc/sof/sof-acpi-dev.h b/sound/soc/sof/sof-acpi-dev.h
new file mode 100644
index 000000000..89adfa507
--- /dev/null
+++ b/sound/soc/sof/sof-acpi-dev.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
+/*
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * Copyright(c) 2021 Intel Corporation
+ */
+
+#ifndef __SOUND_SOC_SOF_ACPI_H
+#define __SOUND_SOC_SOF_ACPI_H
+
+extern const struct dev_pm_ops sof_acpi_pm;
+int sof_acpi_probe(struct platform_device *pdev, const struct sof_dev_desc *desc);
+void sof_acpi_remove(struct platform_device *pdev);
+
+#endif