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, 20 insertions, 0 deletions

diff --git a/drivers/phy/tegra/Kconfig b/drivers/phy/tegra/Kconfig
new file mode 100644
index 000000000..f0734415f
--- /dev/null
+++ b/drivers/phy/tegra/Kconfig
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config PHY_TEGRA_XUSB
+	tristate "NVIDIA Tegra XUSB pad controller driver"
+	depends on ARCH_TEGRA && USB_SUPPORT
+	select USB_COMMON
+	select USB_CONN_GPIO if GPIOLIB
+	select USB_PHY
+	help
+	  Choose this option if you have an NVIDIA Tegra SoC.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called phy-tegra-xusb.
+
+config PHY_TEGRA194_P2U
+	tristate "NVIDIA Tegra194 PIPE2UPHY PHY driver"
+	depends on ARCH_TEGRA || COMPILE_TEST
+	select GENERIC_PHY
+	help
+	  Enable this to support the P2U (PIPE to UPHY) that is part of Tegra 19x
+	  and 234 SOCs.