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Fix an rtmutex missed-wakeup bug.
Signed-off-by: Ingo Molnar <mingo@kernel.org> -----BEGIN PGP SIGNATURE----- iQJFBAABCgAvFiEEBpT5eoXrXCwVQwEKEnMQ0APhK1gFAmPnV1wRHG1pbmdvQGtl cm5lbC5vcmcACgkQEnMQ0APhK1gWxg/8D6jl/Wl/16LkcnLk8eRWGmF34u24lGPK d8T9VN0fF0Pnz0vQVNyuhpdSARX1PvaOAyvx/gv0KE+OjeNYdXWTHavNEekpBeKA 0XFrw2xoa+M7kJE1LswARk23ynFtLZoFD05G3fNZ6NxK/uxRepZzxUyAmwYE9ibG 9gekg+IeTysaCtmIKHkCOgcLvSy41/JEJMtA3CHA3Bww/CdPd5JSc9ERqZKYCp3L lVHNtmTZotZ4TA0Dzgx+OgF1JtoQqQyerPQVhkXjmq0MnTJLjKWnvesF2gBcFLHS 6rovr3eCaO2dm7KGsFlt8Ne6FYEd1us1ifK166xoJgRV+TFFpf2UoDZkEhiCOL63 5x3S35wOuKopsBT4IHK5j2LTfhT8KTFSOsZMN41EPhvYYY5/n1EOrHSvFQKmwEFO jbVvAWHY56YGKH54qePULb+hSrAR1V+AO2ceghusg9BhT4IQ72aR0vkv4hbxd/Zh mufUd5E3+vWLOVbYM7e3ZGFiC6DA/QVZkTvVxKIllE0bzJkGKI80ITeLbjAxFFmp OCs+stGij+SwOxEWfK+I0qz6ae8mL/lgWUr7hhkAi8LXGA/t5q1jErCULZFiPr+6 vugrk2SeQZOEVvfUb0/U3GUdn01yGHak7sz7wJBsd++y8I8FR9q6fb7kawgMCo4I ZydwCwXat2I= =sfDB -----END PGP SIGNATURE----- Merge tag 'locking-urgent-2023-02-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull locking fix from Ingo Molnar: "Fix an rtmutex missed-wakeup bug" * tag 'locking-urgent-2023-02-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: rtmutex: Ensure that the top waiter is always woken up
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commit
338c847304
1 changed files with 3 additions and 2 deletions
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@ -901,8 +901,9 @@ static int __sched rt_mutex_adjust_prio_chain(struct task_struct *task,
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* then we need to wake the new top waiter up to try
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* to get the lock.
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*/
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if (prerequeue_top_waiter != rt_mutex_top_waiter(lock))
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wake_up_state(waiter->task, waiter->wake_state);
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top_waiter = rt_mutex_top_waiter(lock);
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if (prerequeue_top_waiter != top_waiter)
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wake_up_state(top_waiter->task, top_waiter->wake_state);
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raw_spin_unlock_irq(&lock->wait_lock);
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return 0;
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}
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