linux-kernel - [PATCH 3/7] xen/events: fix lateeoi irq acknowledgment

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Message-Id: <20210206104932.29064-4-jgross@suse.com>
Date:   Sat,  6 Feb 2021 11:49:28 +0100
From:   Juergen Gross <jgross@...e.com>
To:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        stable@...r.kernel.org
Subject: [PATCH 3/7] xen/events: fix lateeoi irq acknowledgment

When having accepted an irq as result from receiving an event the
related event should be cleared. The lateeoi model is missing that,
resulting in a continuous stream of events being signalled.

Fixes: 54c9de89895e0a ("xen/events: add a new late EOI evtchn framework")
Cc: stable@...r.kernel.org
Signed-off-by: Juergen Gross <jgross@...e.com>
---
 drivers/xen/events/events_base.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 6a836d131e73..7b26ef817f8b 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -1826,6 +1826,7 @@ static void lateeoi_ack_dynirq(struct irq_data *data)
 	if (VALID_EVTCHN(evtchn)) {
 		info->eoi_pending = true;
 		mask_evtchn(evtchn);
+		clear_evtchn(evtchn);
 	}
 }
 
@@ -1838,6 +1839,7 @@ static void lateeoi_mask_ack_dynirq(struct irq_data *data)
 		info->masked = true;
 		info->eoi_pending = true;
 		mask_evtchn(evtchn);
+		clear_evtchn(evtchn);
 	}
 }
 
-- 
2.26.2