linux-kernel - [PATCH 6.6 598/638] xen/evtchn: avoid WARN() when unbinding an event channel

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Date: Sun, 24 Mar 2024 19:00:35 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Juergen Gross <jgross@...e.com>,
	Demi Marie Obenour <demi@...isiblethingslab.com>,
	Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.6 598/638] xen/evtchn: avoid WARN() when unbinding an event channel

From: Juergen Gross <jgross@...e.com>

[ Upstream commit 51c23bd691c0f1fb95b29731c356c6fd69925d17 ]

When unbinding a user event channel, the related handler might be
called a last time in case the kernel was built with
CONFIG_DEBUG_SHIRQ. This might cause a WARN() in the handler.

Avoid that by adding an "unbinding" flag to struct user_event which
will short circuit the handler.

Fixes: 9e90e58c11b7 ("xen: evtchn: Allow shared registration of IRQ handers")
Reported-by: Demi Marie Obenour <demi@...isiblethingslab.com>
Tested-by: Demi Marie Obenour <demi@...isiblethingslab.com>
Signed-off-by: Juergen Gross <jgross@...e.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Link: https://lore.kernel.org/r/20240313071409.25913-2-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@...e.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/xen/evtchn.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c
index 59717628ca42b..f6a2216c2c870 100644
--- a/drivers/xen/evtchn.c
+++ b/drivers/xen/evtchn.c
@@ -85,6 +85,7 @@ struct user_evtchn {
 	struct per_user_data *user;
 	evtchn_port_t port;
 	bool enabled;
+	bool unbinding;
 };
 
 static void evtchn_free_ring(evtchn_port_t *ring)
@@ -164,6 +165,10 @@ static irqreturn_t evtchn_interrupt(int irq, void *data)
 	struct per_user_data *u = evtchn->user;
 	unsigned int prod, cons;
 
+	/* Handler might be called when tearing down the IRQ. */
+	if (evtchn->unbinding)
+		return IRQ_HANDLED;
+
 	WARN(!evtchn->enabled,
 	     "Interrupt for port %u, but apparently not enabled; per-user %p\n",
 	     evtchn->port, u);
@@ -421,6 +426,7 @@ static void evtchn_unbind_from_user(struct per_user_data *u,
 
 	BUG_ON(irq < 0);
 
+	evtchn->unbinding = true;
 	unbind_from_irqhandler(irq, evtchn);
 
 	del_evtchn(u, evtchn);
-- 
2.43.0