printk: wake up all waiters

jogness · pmladek · commit 938ba4084abc · 2022-04-22T21:30:57.000+02:00
There can be multiple tasks waiting for new records. They should all be woken. Use wake_up_interruptible_all() instead of wake_up_interruptible(). Signed-off-by: John Ogness <john.ogness@linutronix.de> Reviewed-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20220421212250.565456-5-john.ogness@linutronix.de
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
@@ -3326,7 +3326,7 @@ static void wake_up_klogd_work_func(struct irq_work *irq_work)
 	}
 
 	if (pending & PRINTK_PENDING_WAKEUP)
-		wake_up_interruptible(&log_wait);
+		wake_up_interruptible_all(&log_wait);
 }
 
 static DEFINE_PER_CPU(struct irq_work, wake_up_klogd_work) =

Original file line number	Diff line number	Diff line change
`@@ -3326,7 +3326,7 @@ static void wake_up_klogd_work_func(struct irq_work *irq_work)`
`3326`	`3326`	`}`
`3327`	`3327`
`3328`	`3328`	`if (pending & PRINTK_PENDING_WAKEUP)`
`3329`		`- wake_up_interruptible(&log_wait);`
	`3329`	`+ wake_up_interruptible_all(&log_wait);`
`3330`	`3330`	`}`
`3331`	`3331`
`3332`	`3332`	`static DEFINE_PER_CPU(struct irq_work, wake_up_klogd_work) =`