Kurt KanzenbachandGreg Kroah-Hartman cb90b0e39f ptp: vclock: Switch from RCU to SRCU ...

[ Upstream commit 672bd0519e ]

The usage of PTP vClocks leads immediately to the following issues with
ptp4l with LOCKDEP and DEBUG_ATOMIC_SLEEP enabled: "BUG: sleeping function
called from invalid context".

ptp_convert_timestamp() acquires a mutex_t within a RCU read section.  This
is illegal, because acquiring a mutex_t can result in voluntary scheduling
request which is not allowed within a RCU read section.

Replace the RCU usage with SRCU where sleeping is allowed.

Reported-by: Florian Zeitz <florian.zeitz@schettke.com>
Closes: https://lore.kernel.org/all/00a8cce8-410e-4038-98af-49be6d93d7bd@schettke.com/
Fixes: 67d93ffc0f ("ptp: vclock: use mutex to fix "sleep on atomic" bug")
Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://patch.msgid.link/20260529-vclock_rcu-v2-1-02a5531fab92@linutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2026-06-19 13:37:09 +02:00

..

Kconfig

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Makefile

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ptp_chardev.c

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ptp_clock.c

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ptp_clockmatrix.c

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ptp_clockmatrix.h

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ptp_dte.c

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ptp_idt82p33.c

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ptp_idt82p33.h

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ptp_ines.c

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ptp_kvm_arm.c

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ptp_kvm_common.c

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ptp_kvm_x86.c

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ptp_ocp.c

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ptp_pch.c

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ptp_private.h

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ptp_qoriq_debugfs.c

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ptp_qoriq.c

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ptp_sysfs.c

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ptp_vclock.c

ptp: vclock: Switch from RCU to SRCU

2026-06-19 13:37:09 +02:00

ptp_vmw.c

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