Idan Horowitz 662143e0a9 Kernel: Resolve deadlock in MasterPTY due to mutex in spinlock scope ...

MasterPTY::read called DoubleBuffer::read which takes a mutex (which
may block) while holding m_slave's spinlock. If it did block, and was
later rescheduled on a different physical CPU, we would deadlock on
re-locking m_slave inside the unblock callback. (Since our recursive
spinlock implementation is processor based and not process based)

2023-12-16 12:55:41 +01:00

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