From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops 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 --- drivers/dma/dw/Kconfig | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 drivers/dma/dw/Kconfig (limited to 'drivers/dma/dw/Kconfig') diff --git a/drivers/dma/dw/Kconfig b/drivers/dma/dw/Kconfig new file mode 100644 index 000000000..a9828ddd6 --- /dev/null +++ b/drivers/dma/dw/Kconfig @@ -0,0 +1,36 @@ +# SPDX-License-Identifier: GPL-2.0 + +# +# DMA engine configuration for dw +# + +config DW_DMAC_CORE + tristate + select DMA_ENGINE + +config DW_DMAC + tristate "Synopsys DesignWare AHB DMA platform driver" + depends on HAS_IOMEM + select DW_DMAC_CORE + help + Support the Synopsys DesignWare AHB DMA controller. This + can be integrated in chips such as the Intel Cherrytrail. + +config RZN1_DMAMUX + tristate "Renesas RZ/N1 DMAMUX driver" + depends on DW_DMAC + depends on ARCH_RZN1 || COMPILE_TEST + help + Support the Renesas RZ/N1 DMAMUX which is located in front of + the Synopsys DesignWare AHB DMA controller located on Renesas + SoCs. + +config DW_DMAC_PCI + tristate "Synopsys DesignWare AHB DMA PCI driver" + depends on PCI + depends on HAS_IOMEM + select DW_DMAC_CORE + help + Support the Synopsys DesignWare AHB DMA controller on the + platforms that enumerate it as a PCI device. For example, + Intel Medfield has integrated this GPDMA controller. -- cgit v1.3.1