Merging upstream version 6.7.12.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

3 files changed, 20 insertions, 10 deletions

diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 3b9f080109..27553673e4 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -1190,7 +1190,7 @@ int xen_pirq_from_irq(unsigned irq)
 EXPORT_SYMBOL_GPL(xen_pirq_from_irq);
 
 static int bind_evtchn_to_irq_chip(evtchn_port_t evtchn, struct irq_chip *chip,
-				   struct xenbus_device *dev)
+				   struct xenbus_device *dev, bool shared)
 {
 	int ret = -ENOMEM;
 	struct irq_info *info;
@@ -1224,7 +1224,8 @@ static int bind_evtchn_to_irq_chip(evtchn_port_t evtchn, struct irq_chip *chip,
 		 */
 		bind_evtchn_to_cpu(info, 0, false);
 	} else if (!WARN_ON(info->type != IRQT_EVTCHN)) {
-		info->refcnt++;
+		if (shared && !WARN_ON(info->refcnt < 0))
+			info->refcnt++;
 	}
 
 	ret = info->irq;
@@ -1237,13 +1238,13 @@ out:
 
 int bind_evtchn_to_irq(evtchn_port_t evtchn)
 {
-	return bind_evtchn_to_irq_chip(evtchn, &xen_dynamic_chip, NULL);
+	return bind_evtchn_to_irq_chip(evtchn, &xen_dynamic_chip, NULL, false);
 }
 EXPORT_SYMBOL_GPL(bind_evtchn_to_irq);
 
 int bind_evtchn_to_irq_lateeoi(evtchn_port_t evtchn)
 {
-	return bind_evtchn_to_irq_chip(evtchn, &xen_lateeoi_chip, NULL);
+	return bind_evtchn_to_irq_chip(evtchn, &xen_lateeoi_chip, NULL, false);
 }
 EXPORT_SYMBOL_GPL(bind_evtchn_to_irq_lateeoi);
 
@@ -1295,7 +1296,8 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
 
 static int bind_interdomain_evtchn_to_irq_chip(struct xenbus_device *dev,
 					       evtchn_port_t remote_port,
-					       struct irq_chip *chip)
+					       struct irq_chip *chip,
+					       bool shared)
 {
 	struct evtchn_bind_interdomain bind_interdomain;
 	int err;
@@ -1307,14 +1309,14 @@ static int bind_interdomain_evtchn_to_irq_chip(struct xenbus_device *dev,
 					  &bind_interdomain);
 
 	return err ? : bind_evtchn_to_irq_chip(bind_interdomain.local_port,
-					       chip, dev);
+					       chip, dev, shared);
 }
 
 int bind_interdomain_evtchn_to_irq_lateeoi(struct xenbus_device *dev,
 					   evtchn_port_t remote_port)
 {
 	return bind_interdomain_evtchn_to_irq_chip(dev, remote_port,
-						   &xen_lateeoi_chip);
+						   &xen_lateeoi_chip, false);
 }
 EXPORT_SYMBOL_GPL(bind_interdomain_evtchn_to_irq_lateeoi);
 
@@ -1430,7 +1432,8 @@ static int bind_evtchn_to_irqhandler_chip(evtchn_port_t evtchn,
 {
 	int irq, retval;
 
-	irq = bind_evtchn_to_irq_chip(evtchn, chip, NULL);
+	irq = bind_evtchn_to_irq_chip(evtchn, chip, NULL,
+				      irqflags & IRQF_SHARED);
 	if (irq < 0)
 		return irq;
 	retval = request_irq(irq, handler, irqflags, devname, dev_id);
@@ -1471,7 +1474,8 @@ static int bind_interdomain_evtchn_to_irqhandler_chip(
 {
 	int irq, retval;
 
-	irq = bind_interdomain_evtchn_to_irq_chip(dev, remote_port, chip);
+	irq = bind_interdomain_evtchn_to_irq_chip(dev, remote_port, chip,
+						  irqflags & IRQF_SHARED);
 	if (irq < 0)
 		return irq;
 
diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c
index 59717628ca..f6a2216c2c 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);
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 0eb337a8ec..35b6e30602 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -1147,7 +1147,7 @@ static irqreturn_t ioeventfd_interrupt(int irq, void *dev_id)
 		if (ioreq->addr == kioeventfd->addr + VIRTIO_MMIO_QUEUE_NOTIFY &&
 		    ioreq->size == kioeventfd->addr_len &&
 		    (ioreq->data & QUEUE_NOTIFY_VQ_MASK) == kioeventfd->vq) {
-			eventfd_signal(kioeventfd->eventfd, 1);
+			eventfd_signal(kioeventfd->eventfd);
 			state = STATE_IORESP_READY;
 			break;
 		}