genirq: Fix misleading synchronize_irq() documentation
commit 1d21f2af8571c6a6a44e7c1911780614847b0253 upstream
The function might sleep, so it cannot be called from interrupt
context. Not even with care.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Link: https://lkml.kernel.org/r/20190628111440.189241552@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 5c76ed5..f8214bb 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -96,7 +96,8 @@
* 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)
{