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authorDavid S. Miller <davem@sunset.davemloft.net>2007-07-12 13:47:50 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-16 04:04:28 -0700
commit43fdf27470b216ebdef47e09ff83bed2f2894b13 (patch)
tree76b9b838089e5679471026037c93325c228df84a /drivers/net/sunvnet.c
parent133f09a169f3022be3de671b29658b7ecb375022 (diff)
downloadlinux-43fdf27470b216ebdef47e09ff83bed2f2894b13.tar.bz2
[SPARC64]: Abstract out mdesc accesses for better MD update handling.
Since we have to be able to handle MD updates, having an in-tree set of data structures representing the MD objects actually makes things more painful. The MD itself is easy to parse, and we can implement the existing interfaces using direct parsing of the MD binary image. The MD is now reference counted, so accesses have to now take the form: handle = mdesc_grab(); ... operations on MD ... mdesc_release(handle); The only remaining issue are cases where code holds on to references to MD property values. mdesc_get_property() returns a direct pointer to the property value, most cases just pull in the information they need and discard the pointer, but there are few that use the pointer directly over a long lifetime. Those will be fixed up in a subsequent changeset. A preliminary handler for MD update events from domain services is there, it is rudimentry but it works and handles all of the reference counting. It does not check the generation number of the MDs, and it does not generate a "add/delete" list for notification to interesting parties about MD changes but that will be forthcoming. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/sunvnet.c')
-rw-r--r--drivers/net/sunvnet.c34
1 files changed, 21 insertions, 13 deletions
diff --git a/drivers/net/sunvnet.c b/drivers/net/sunvnet.c
index d764e4ccba56..8a667c13faef 100644
--- a/drivers/net/sunvnet.c
+++ b/drivers/net/sunvnet.c
@@ -892,7 +892,7 @@ const char *remote_macaddr_prop = "remote-mac-address";
static int __devinit vnet_port_probe(struct vio_dev *vdev,
const struct vio_device_id *id)
{
- struct mdesc_node *endp;
+ struct mdesc_handle *hp;
struct vnet_port *port;
unsigned long flags;
struct vnet *vp;
@@ -905,23 +905,21 @@ static int __devinit vnet_port_probe(struct vio_dev *vdev,
return -ENODEV;
}
- rmac = md_get_property(vdev->mp, remote_macaddr_prop, &len);
+ hp = mdesc_grab();
+
+ rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
+ err = -ENODEV;
if (!rmac) {
printk(KERN_ERR PFX "Port lacks %s property.\n",
remote_macaddr_prop);
- return -ENODEV;
- }
-
- endp = vio_find_endpoint(vdev);
- if (!endp) {
- printk(KERN_ERR PFX "Port lacks channel-endpoint.\n");
- return -ENODEV;
+ goto err_out_put_mdesc;
}
port = kzalloc(sizeof(*port), GFP_KERNEL);
+ err = -ENOMEM;
if (!port) {
printk(KERN_ERR PFX "Cannot allocate vnet_port.\n");
- return -ENOMEM;
+ goto err_out_put_mdesc;
}
for (i = 0; i < ETH_ALEN; i++)
@@ -929,7 +927,7 @@ static int __devinit vnet_port_probe(struct vio_dev *vdev,
port->vp = vp;
- err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, endp,
+ err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
vnet_versions, ARRAY_SIZE(vnet_versions),
&vnet_vio_ops, vp->dev->name);
if (err)
@@ -947,7 +945,7 @@ static int __devinit vnet_port_probe(struct vio_dev *vdev,
INIT_LIST_HEAD(&port->list);
switch_port = 0;
- if (md_get_property(vdev->mp, "switch-port", NULL) != NULL)
+ if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
switch_port = 1;
spin_lock_irqsave(&vp->lock, flags);
@@ -969,6 +967,8 @@ static int __devinit vnet_port_probe(struct vio_dev *vdev,
vio_port_up(&port->vio);
+ mdesc_release(hp);
+
return 0;
err_out_free_ldc:
@@ -977,6 +977,8 @@ err_out_free_ldc:
err_out_free_port:
kfree(port);
+err_out_put_mdesc:
+ mdesc_release(hp);
return err;
}
@@ -1029,6 +1031,7 @@ static int __devinit vnet_probe(struct vio_dev *vdev,
const struct vio_device_id *id)
{
static int vnet_version_printed;
+ struct mdesc_handle *hp;
struct net_device *dev;
struct vnet *vp;
const u64 *mac;
@@ -1037,7 +1040,9 @@ static int __devinit vnet_probe(struct vio_dev *vdev,
if (vnet_version_printed++ == 0)
printk(KERN_INFO "%s", version);
- mac = md_get_property(vdev->mp, local_mac_prop, &len);
+ hp = mdesc_grab();
+
+ mac = mdesc_get_property(hp, vdev->mp, local_mac_prop, &len);
if (!mac) {
printk(KERN_ERR PFX "vnet lacks %s property.\n",
local_mac_prop);
@@ -1093,12 +1098,15 @@ static int __devinit vnet_probe(struct vio_dev *vdev,
dev_set_drvdata(&vdev->dev, vp);
+ mdesc_release(hp);
+
return 0;
err_out_free_dev:
free_netdev(dev);
err_out:
+ mdesc_release(hp);
return err;
}