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Diffstat (limited to 'arch/powerpc/platforms/powernv/opal-irqchip.c')
-rw-r--r--arch/powerpc/platforms/powernv/opal-irqchip.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/powernv/opal-irqchip.c b/arch/powerpc/platforms/powernv/opal-irqchip.c
index 0a00e2aed393..e505223b4ec5 100644
--- a/arch/powerpc/platforms/powernv/opal-irqchip.c
+++ b/arch/powerpc/platforms/powernv/opal-irqchip.c
@@ -83,7 +83,19 @@ static void opal_event_unmask(struct irq_data *d)
set_bit(d->hwirq, &opal_event_irqchip.mask);
opal_poll_events(&events);
- opal_handle_events(be64_to_cpu(events));
+ last_outstanding_events = be64_to_cpu(events);
+
+ /*
+ * We can't just handle the events now with opal_handle_events().
+ * If we did we would deadlock when opal_event_unmask() is called from
+ * handle_level_irq() with the irq descriptor lock held, because
+ * calling opal_handle_events() would call generic_handle_irq() and
+ * then handle_level_irq() which would try to take the descriptor lock
+ * again. Instead queue the events for later.
+ */
+ if (last_outstanding_events & opal_event_irqchip.mask)
+ /* Need to retrigger the interrupt */
+ irq_work_queue(&opal_event_irq_work);
}
static int opal_event_set_type(struct irq_data *d, unsigned int flow_type)