linux-kernel - [PATCH 2/5] irq_work: Ensure that irq

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Message-Id: <20210927211919.310855-3-bigeasy@linutronix.de>
Date:   Mon, 27 Sep 2021 23:19:16 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 2/5] irq_work: Ensure that irq_work runs in in-IRQ context.

The irq-work callback should be invoked in hardirq context and some
callbacks rely on this behaviour. At the time irq_work_run_list()
interrupts should be disabled but the important part is that the
callback is invoked from a in-IRQ context.
The "disabled interrupts" check can be satisfied by disabling interrupts
from a kworker which is not the intended context.

Ensure that the callback is invoked from hardirq context and not just
with disabled interrupts.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 kernel/irq_work.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index db8c248ebc8c8..caf2edffa20d5 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -167,7 +167,7 @@ static void irq_work_run_list(struct llist_head *list)
 	struct irq_work *work, *tmp;
 	struct llist_node *llnode;

-	BUG_ON(!irqs_disabled());
+	BUG_ON(!in_hardirq());

 	if (llist_empty(list))
 		return;
-- 
2.33.0