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Message-Id: <20190628111440.189241552@linutronix.de>
Date: Fri, 28 Jun 2019 13:11:50 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: x86@...nel.org, Marc Zyngier <marc.zyngier@....com>
Subject: [patch V2 2/6] genirq: Fix misleading synchronize_irq() documentation
The function might sleep, so it cannot be called from interrupt
context. Not even with care.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
kernel/irq/manage.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -96,7 +96,8 @@ EXPORT_SYMBOL(synchronize_hardirq);
* to complete before returning. If you use this function while
* holding a resource the IRQ handler may need you will deadlock.
*
- * This function may be called - with care - from IRQ context.
+ * Can only be called from preemptible code as it might sleep when
+ * an interrupt thread is associated to @irq.
*/
void synchronize_irq(unsigned int irq)
{
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