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, 41 insertions, 0 deletions

diff --git a/drivers/phy/spacemit/Kconfig b/drivers/phy/spacemit/Kconfig
new file mode 100644
index 000000000..5fdf18fce
--- /dev/null
+++ b/drivers/phy/spacemit/Kconfig
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Phy drivers for SpacemiT platforms
+#
+config PHY_SPACEMIT_K1_PCIE
+	tristate "PCIe and combo PHY driver for the SpacemiT K1 SoC"
+	depends on ARCH_SPACEMIT || COMPILE_TEST
+	depends on COMMON_CLK
+	depends on HAS_IOMEM
+	depends on OF
+	select GENERIC_PHY
+	default ARCH_SPACEMIT
+	help
+	  Enable support for the PCIe and USB 3 combo PHY and two
+	  PCIe-only PHYs used in the SpacemiT K1 SoC.
+
+config PHY_SPACEMIT_K1_USB2
+	tristate "SpacemiT K1 USB 2.0 PHY support"
+	depends on (ARCH_SPACEMIT || COMPILE_TEST) && OF
+	depends on COMMON_CLK
+	depends on USB_COMMON
+	select GENERIC_PHY
+	help
+	  Enable this to support K1 USB 2.0 PHY driver. This driver takes care of
+	  enabling and clock setup and will be used by K1 udc/ehci/otg/xhci driver.
+
+config PHY_SPACEMIT_K3_COMMON_OPS
+	tristate
+	select MFD_SYSCON
+	select GENERIC_PHY
+
+config PHY_SPACEMIT_K3_COMBO_PHY
+	tristate "SpacemiT K3 USB3/PCIe PHY support"
+	depends on (ARCH_SPACEMIT || COMPILE_TEST) && OF
+	depends on COMMON_CLK
+	select PHY_SPACEMIT_K3_COMMON_OPS
+	help
+	  Enable this to support K3 USB3/PCIe combo PHY driver. This
+	  driver takes care of enabling and clock setup and will be used
+	  by K3 dwc3 driver.
+	  If unsure, say N.