add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/net/9p/trans_xen.c
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@@ -300,6 +300,10 @@
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 	write_unlock(&xen_9pfs_lock);
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 	for (i = 0; i < priv->num_rings; i++) {
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+		struct xen_9pfs_dataring *ring = &priv->rings[i];
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+
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+		cancel_work_sync(&ring->work);
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+
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 		if (!priv->rings[i].intf)
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 			break;
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 		if (priv->rings[i].irq > 0)
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@@ -393,19 +397,24 @@
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 	return ret;
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 }
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-static int xen_9pfs_front_probe(struct xenbus_device *dev,
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-				const struct xenbus_device_id *id)
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+static int xen_9pfs_front_init(struct xenbus_device *dev)
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 {
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 	int ret, i;
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 	struct xenbus_transaction xbt;
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-	struct xen_9pfs_front_priv *priv = NULL;
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-	char *versions;
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+	struct xen_9pfs_front_priv *priv = dev_get_drvdata(&dev->dev);
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+	char *versions, *v;
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 	unsigned int max_rings, max_ring_order, len = 0;
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 	versions = xenbus_read(XBT_NIL, dev->otherend, "versions", &len);
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 	if (IS_ERR(versions))
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 		return PTR_ERR(versions);
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-	if (strcmp(versions, "1")) {
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+	for (v = versions; *v; v++) {
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+		if (simple_strtoul(v, &v, 10) == 1) {
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+			v = NULL;
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+			break;
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+		}
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+	}
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+	if (v) {
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 		kfree(versions);
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 		return -EINVAL;
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 	}
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@@ -420,11 +429,6 @@
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 	if (p9_xen_trans.maxsize > XEN_FLEX_RING_SIZE(max_ring_order))
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 		p9_xen_trans.maxsize = XEN_FLEX_RING_SIZE(max_ring_order) / 2;
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-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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-	if (!priv)
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-		return -ENOMEM;
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-
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-	priv->dev = dev;
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 	priv->num_rings = XEN_9PFS_NUM_RINGS;
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 	priv->rings = kcalloc(priv->num_rings, sizeof(*priv->rings),
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 			      GFP_KERNEL);
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@@ -483,21 +487,33 @@
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 		goto error;
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 	}
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-	write_lock(&xen_9pfs_lock);
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-	list_add_tail(&priv->list, &xen_9pfs_devs);
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-	write_unlock(&xen_9pfs_lock);
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-	dev_set_drvdata(&dev->dev, priv);
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-	xenbus_switch_state(dev, XenbusStateInitialised);
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-
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 	return 0;
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  error_xenbus:
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 	xenbus_transaction_end(xbt, 1);
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 	xenbus_dev_fatal(dev, ret, "writing xenstore");
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  error:
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-	dev_set_drvdata(&dev->dev, NULL);
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 	xen_9pfs_front_free(priv);
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 	return ret;
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+}
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+
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+static int xen_9pfs_front_probe(struct xenbus_device *dev,
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+				const struct xenbus_device_id *id)
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+{
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+	struct xen_9pfs_front_priv *priv = NULL;
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+
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+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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+	if (!priv)
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+		return -ENOMEM;
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+
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+	priv->dev = dev;
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+	dev_set_drvdata(&dev->dev, priv);
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+
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+	write_lock(&xen_9pfs_lock);
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+	list_add_tail(&priv->list, &xen_9pfs_devs);
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+	write_unlock(&xen_9pfs_lock);
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+
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+	return 0;
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 }
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 static int xen_9pfs_front_resume(struct xenbus_device *dev)
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@@ -518,6 +534,8 @@
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 		break;
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 	case XenbusStateInitWait:
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+		if (!xen_9pfs_front_init(dev))
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+			xenbus_switch_state(dev, XenbusStateInitialised);
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 		break;
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 	case XenbusStateConnected: