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/misc/cardreader/rts5260.h | 45 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 drivers/misc/cardreader/rts5260.h (limited to 'drivers/misc/cardreader/rts5260.h') diff --git a/drivers/misc/cardreader/rts5260.h b/drivers/misc/cardreader/rts5260.h new file mode 100644 index 000000000..53a1411c8 --- /dev/null +++ b/drivers/misc/cardreader/rts5260.h @@ -0,0 +1,45 @@ +#ifndef __RTS5260_H__ +#define __RTS5260_H__ + +#define RTS5260_DVCC_CTRL 0xFF73 +#define RTS5260_DVCC_OCP_EN (0x01 << 7) +#define RTS5260_DVCC_OCP_THD_MASK (0x07 << 4) +#define RTS5260_DVCC_POWERON (0x01 << 3) +#define RTS5260_DVCC_OCP_CL_EN (0x01 << 2) + +#define RTS5260_DVIO_CTRL 0xFF75 +#define RTS5260_DVIO_OCP_EN (0x01 << 7) +#define RTS5260_DVIO_OCP_THD_MASK (0x07 << 4) +#define RTS5260_DVIO_POWERON (0x01 << 3) +#define RTS5260_DVIO_OCP_CL_EN (0x01 << 2) + +#define RTS5260_DV331812_CFG 0xFF71 +#define RTS5260_DV331812_OCP_EN (0x01 << 7) +#define RTS5260_DV331812_OCP_THD_MASK (0x07 << 4) +#define RTS5260_DV331812_POWERON (0x01 << 3) +#define RTS5260_DV331812_SEL (0x01 << 2) +#define RTS5260_DV331812_VDD1 (0x01 << 2) +#define RTS5260_DV331812_VDD2 (0x00 << 2) + +#define RTS5260_DV331812_OCP_THD_120 (0x00 << 4) +#define RTS5260_DV331812_OCP_THD_140 (0x01 << 4) +#define RTS5260_DV331812_OCP_THD_160 (0x02 << 4) +#define RTS5260_DV331812_OCP_THD_180 (0x03 << 4) +#define RTS5260_DV331812_OCP_THD_210 (0x04 << 4) +#define RTS5260_DV331812_OCP_THD_240 (0x05 << 4) +#define RTS5260_DV331812_OCP_THD_270 (0x06 << 4) +#define RTS5260_DV331812_OCP_THD_300 (0x07 << 4) + +#define RTS5260_DVIO_OCP_THD_250 (0x00 << 4) +#define RTS5260_DVIO_OCP_THD_300 (0x01 << 4) +#define RTS5260_DVIO_OCP_THD_350 (0x02 << 4) +#define RTS5260_DVIO_OCP_THD_400 (0x03 << 4) +#define RTS5260_DVIO_OCP_THD_450 (0x04 << 4) +#define RTS5260_DVIO_OCP_THD_500 (0x05 << 4) +#define RTS5260_DVIO_OCP_THD_550 (0x06 << 4) +#define RTS5260_DVIO_OCP_THD_600 (0x07 << 4) + +#define RTS5260_DVCC_OCP_THD_550 (0x00 << 4) +#define RTS5260_DVCC_OCP_THD_970 (0x05 << 4) + +#endif -- cgit v1.3.1