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, 46 insertions, 0 deletions

diff --git a/drivers/phy/socionext/Kconfig b/drivers/phy/socionext/Kconfig
new file mode 100644
index 000000000..8ae644756
--- /dev/null
+++ b/drivers/phy/socionext/Kconfig
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# PHY drivers for Socionext platforms.
+#
+
+config PHY_UNIPHIER_USB2
+	tristate "UniPhier USB2 PHY driver"
+	depends on ARCH_UNIPHIER || COMPILE_TEST
+	depends on OF && HAS_IOMEM
+	select GENERIC_PHY
+	select MFD_SYSCON
+	help
+	  Enable this to support USB PHY implemented on USB2 controller
+	  on UniPhier SoCs. This driver provides interface to interact
+	  with USB 2.0 PHY that is part of the UniPhier SoC.
+	  In case of Pro4, it is necessary to specify this USB2 PHY instead
+	  of USB3 HS-PHY.
+
+config PHY_UNIPHIER_USB3
+	tristate "UniPhier USB3 PHY driver"
+	depends on ARCH_UNIPHIER || COMPILE_TEST
+	depends on OF && HAS_IOMEM
+	select GENERIC_PHY
+	help
+	  Enable this to support USB PHY implemented in USB3 controller
+	  on UniPhier SoCs. This controller supports USB3.0 and lower speed.
+
+config PHY_UNIPHIER_PCIE
+	tristate "Uniphier PHY driver for PCIe controller"
+	depends on ARCH_UNIPHIER || COMPILE_TEST
+	depends on OF && HAS_IOMEM
+	default PCIE_UNIPHIER
+	select GENERIC_PHY
+	help
+	  Enable this to support PHY implemented in PCIe controller
+	  on UniPhier SoCs. This driver supports LD20 and PXs3 SoCs.
+
+config PHY_UNIPHIER_AHCI
+	tristate "UniPhier AHCI PHY driver"
+	depends on ARCH_UNIPHIER || COMPILE_TEST
+	depends on OF && HAS_IOMEM
+	default SATA_AHCI_PLATFORM
+	select GENERIC_PHY
+	help
+	  Enable this to support PHY implemented in AHCI controller
+	  on UniPhier SoCs. This driver supports Pro4, PXs2 and PXs3 SoCs.