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authorThomas Gleixner <tglx@linutronix.de>2019-06-28 13:11:50 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-07-21 09:00:39 +0200
commit41e95c3449ef098f8c05a778f23b1b9b0b54d3b7 (patch)
parent5db47f4300fafb8f9bf2c95036160f76d5ce73f5 (diff)
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>
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 54a41da65eb3..df8498dcb392 100644
--- 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)