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printk: Update @console_may_schedule in console_trylock_spinning()
[ Upstream commit8076972468
] console_trylock_spinning() may takeover the console lock from a schedulable context. Update @console_may_schedule to make sure it reflects a trylock acquire. Reported-by: Mukesh Ojha <quic_mojha@quicinc.com> Closes: https://lore.kernel.org/lkml/20240222090538.23017-1-quic_mojha@quicinc.com Fixes:dbdda842fe
("printk: Add console owner and waiter logic to load balance console writes") Signed-off-by: John Ogness <john.ogness@linutronix.de> Reviewed-by: Mukesh Ojha <quic_mojha@quicinc.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/875xybmo2z.fsf@jogness.linutronix.de Signed-off-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -1947,6 +1947,12 @@ static int console_trylock_spinning(void)
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*/
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mutex_acquire(&console_lock_dep_map, 0, 1, _THIS_IP_);
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/*
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* Update @console_may_schedule for trylock because the previous
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* owner may have been schedulable.
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*/
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console_may_schedule = 0;
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return 1;
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}
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