From 020db9d3c1dc0aab9ab1252f4a36b6d8456b8794 Mon Sep 17 00:00:00 2001 From: Liu Shuo Date: Sun, 30 Jul 2017 00:59:57 +0800 Subject: [PATCH] xen/events: Fix interrupt lost during irq_disable and irq_enable Here is a device has xen-pirq-MSI interrupt. Dom0 might lost interrupt during driver irq_disable/irq_enable. Here is the scenario, 1. irq_disable -> disable_dynirq -> mask_evtchn(irq channel) 2. dev interrupt raised by HW and Xen mark its evtchn as pending 3. irq_enable -> startup_pirq -> eoi_pirq -> clear_evtchn(channel of irq) -> clear pending status 4. consume_one_event process the irq event without pending bit assert which result in interrupt lost once 5. No HW interrupt raising anymore. Now use enable_dynirq for enable_pirq of xen_pirq_chip to remove eoi_pirq when irq_enable. Signed-off-by: Liu Shuo Reviewed-by: Boris Ostrovsky Signed-off-by: Juergen Gross --- drivers/xen/events/events_base.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index bae1f5d36c26..2d43118077e4 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -574,7 +574,7 @@ static void shutdown_pirq(struct irq_data *data) static void enable_pirq(struct irq_data *data) { - startup_pirq(data); + enable_dynirq(data); } static void disable_pirq(struct irq_data *data)