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, 97 insertions, 0 deletions

diff --git a/drivers/net/mdio/mdio-octeon.c b/drivers/net/mdio/mdio-octeon.c
new file mode 100644
index 000000000..cb53dccbd
--- /dev/null
+++ b/drivers/net/mdio/mdio-octeon.c
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2009-2015 Cavium, Inc.
+ */
+
+#include <linux/gfp.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_mdio.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+
+#include "mdio-cavium.h"
+
+static int octeon_mdiobus_probe(struct platform_device *pdev)
+{
+	struct cavium_mdiobus *bus;
+	struct mii_bus *mii_bus;
+	union cvmx_smix_en smi_en;
+	int err;
+
+	mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
+	if (!mii_bus)
+		return -ENOMEM;
+
+	bus = mii_bus->priv;
+	bus->mii_bus = mii_bus;
+
+	bus->register_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(bus->register_base)) {
+		dev_err(&pdev->dev, "dev_ioremap failed\n");
+		return PTR_ERR(bus->register_base);
+	}
+
+	smi_en.u64 = 0;
+	smi_en.s.en = 1;
+	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
+
+	bus->mii_bus->name = KBUILD_MODNAME;
+	snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%px", bus->register_base);
+	bus->mii_bus->parent = &pdev->dev;
+
+	bus->mii_bus->read = cavium_mdiobus_read_c22;
+	bus->mii_bus->write = cavium_mdiobus_write_c22;
+	bus->mii_bus->read_c45 = cavium_mdiobus_read_c45;
+	bus->mii_bus->write_c45 = cavium_mdiobus_write_c45;
+
+	platform_set_drvdata(pdev, bus);
+
+	err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
+	if (err)
+		goto fail_register;
+
+	dev_info(&pdev->dev, "Probed\n");
+
+	return 0;
+fail_register:
+	smi_en.u64 = 0;
+	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
+	return err;
+}
+
+static void octeon_mdiobus_remove(struct platform_device *pdev)
+{
+	struct cavium_mdiobus *bus;
+	union cvmx_smix_en smi_en;
+
+	bus = platform_get_drvdata(pdev);
+
+	mdiobus_unregister(bus->mii_bus);
+	smi_en.u64 = 0;
+	oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
+}
+
+static const struct of_device_id octeon_mdiobus_match[] = {
+	{
+		.compatible = "cavium,octeon-3860-mdio",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
+
+static struct platform_driver octeon_mdiobus_driver = {
+	.driver = {
+		.name		= KBUILD_MODNAME,
+		.of_match_table = octeon_mdiobus_match,
+	},
+	.probe		= octeon_mdiobus_probe,
+	.remove		= octeon_mdiobus_remove,
+};
+
+module_platform_driver(octeon_mdiobus_driver);
+
+MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
+MODULE_AUTHOR("David Daney");
+MODULE_LICENSE("GPL v2");