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, 85 insertions, 0 deletions

diff --git a/drivers/clk/rockchip/gate-link.c b/drivers/clk/rockchip/gate-link.c
new file mode 100644
index 000000000..cd0f7a2d3
--- /dev/null
+++ b/drivers/clk/rockchip/gate-link.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2024 Collabora Ltd.
+ * Author: Sebastian Reichel <sebastian.reichel@collabora.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/pm_clock.h>
+#include <linux/pm_runtime.h>
+#include <linux/property.h>
+#include "clk.h"
+
+static int rk_clk_gate_link_register(struct device *dev,
+				     struct rockchip_clk_provider *ctx,
+				     struct rockchip_clk_branch *clkbr)
+{
+	unsigned long flags = clkbr->flags | CLK_SET_RATE_PARENT;
+	struct clk *clk;
+
+	clk = clk_register_gate(dev, clkbr->name, clkbr->parent_names[0],
+				flags, ctx->reg_base + clkbr->gate_offset,
+				clkbr->gate_shift, clkbr->gate_flags,
+				&ctx->lock);
+
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	rockchip_clk_set_lookup(ctx, clk, clkbr->id);
+	return 0;
+}
+
+static int rk_clk_gate_link_probe(struct platform_device *pdev)
+{
+	struct rockchip_gate_link_platdata *pdata;
+	struct device *dev = &pdev->dev;
+	struct clk *linked_clk;
+	int ret;
+
+	pdata = dev_get_platdata(dev);
+	if (!pdata)
+		return dev_err_probe(dev, -ENODEV, "missing platform data");
+
+	ret = devm_pm_runtime_enable(dev);
+	if (ret)
+		return ret;
+
+	ret = devm_pm_clk_create(dev);
+	if (ret)
+		return ret;
+
+	linked_clk = rockchip_clk_get_lookup(pdata->ctx, pdata->clkbr->linked_clk_id);
+	ret = pm_clk_add_clk(dev, linked_clk);
+	if (ret)
+		return ret;
+
+	ret = rk_clk_gate_link_register(dev, pdata->ctx, pdata->clkbr);
+	if (ret)
+		goto err;
+
+	return 0;
+
+err:
+	pm_clk_remove_clk(dev, linked_clk);
+	return ret;
+}
+
+static const struct dev_pm_ops rk_clk_gate_link_pm_ops = {
+	SET_RUNTIME_PM_OPS(pm_clk_suspend, pm_clk_resume, NULL)
+};
+
+static struct platform_driver rk_clk_gate_link_driver = {
+	.probe		= rk_clk_gate_link_probe,
+	.driver		= {
+		.name	= "rockchip-gate-link-clk",
+		.pm = &rk_clk_gate_link_pm_ops,
+		.suppress_bind_attrs = true,
+	},
+};
+
+static int __init rk_clk_gate_link_drv_register(void)
+{
+	return platform_driver_register(&rk_clk_gate_link_driver);
+}
+core_initcall(rk_clk_gate_link_drv_register);