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| author | John Ogness <john.ogness@linutronix.de> | 2024-02-26 13:07:24 +0106 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2024-03-15 17:03:32 +0100 |
| commit | 8076972468584d4a21dab9aa50e388b3ea9ad8c7 (patch) | |
| tree | 1ff0b6d32afa86c09b4821056b9f43bfd5911ccc /kernel | |
| parent | b0546776ad3f332e215cebc0b063ba4351971cca (diff) | |
| download | lwn-8076972468584d4a21dab9aa50e388b3ea9ad8c7.tar.gz lwn-8076972468584d4a21dab9aa50e388b3ea9ad8c7.zip | |
printk: Update @console_may_schedule in console_trylock_spinning()
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: dbdda842fe96 ("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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/printk/printk.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index b06f63e276c1..612c73333848 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -2009,6 +2009,12 @@ static int console_trylock_spinning(void) */ mutex_acquire(&console_lock_dep_map, 0, 1, _THIS_IP_); + /* + * Update @console_may_schedule for trylock because the previous + * owner may have been schedulable. + */ + console_may_schedule = 0; + return 1; } |