From: John Ogness <john.ogness@linutronix.de>
Date: Thu, 21 Apr 2022 21:22:39 +0000 (+0206)
Subject: printk: wake up all waiters
X-Git-Tag: baikal/aarch64/sdk6.1~3940^2^2~12
X-Git-Url: https://git.baikalelectronics.ru/?a=commitdiff_plain;h=fc67ff71e216cbc8816d2962ee3c857ef4d8c8e9;p=kernel.git

printk: wake up all waiters

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
index f817dfb4852d4..e233570026480 100644
--- 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) =