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Kurt Kanzenbach
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 <[email protected]>
Closes: https://lore.kernel.org/all/[email protected]/
Fixes: 67d93ffc0f ("ptp: vclock: use mutex to fix "sleep on atomic" bug")
Signed-off-by: Kurt Kanzenbach <[email protected]>
Reviewed-by: Sebastian Andrzej Siewior <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>