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authorDavid S. Miller <davem@sunset.davemloft.net>2007-07-13 00:47:50 +0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-16 15:04:28 +0400
commit43fdf27470b216ebdef47e09ff83bed2f2894b13 (patch)
tree76b9b838089e5679471026037c93325c228df84a /drivers/block
parent133f09a169f3022be3de671b29658b7ecb375022 (diff)
downloadlinux-43fdf27470b216ebdef47e09ff83bed2f2894b13.tar.xz
[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/block')
-rw-r--r--drivers/block/sunvdc.c24
1 files changed, 13 insertions, 11 deletions
diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c
index 8dbbeace52a1..0f5e3caf85d7 100644
--- a/drivers/block/sunvdc.c
+++ b/drivers/block/sunvdc.c
@@ -750,7 +750,7 @@ static struct vio_driver_ops vdc_vio_ops = {
static int __devinit vdc_port_probe(struct vio_dev *vdev,
const struct vio_device_id *id)
{
- struct mdesc_node *endp;
+ struct mdesc_handle *hp;
struct vdc_port *port;
unsigned long flags;
struct vdc *vp;
@@ -763,26 +763,24 @@ static int __devinit vdc_port_probe(struct vio_dev *vdev,
return -ENODEV;
}
- endp = vio_find_endpoint(vdev);
- if (!endp) {
- printk(KERN_ERR PFX "Port lacks channel-endpoint.\n");
- return -ENODEV;
- }
+ hp = mdesc_grab();
- port_id = md_get_property(vdev->mp, "id", NULL);
+ port_id = mdesc_get_property(hp, vdev->mp, "id", NULL);
+ err = -ENODEV;
if (!port_id) {
printk(KERN_ERR PFX "Port lacks id property.\n");
- return -ENODEV;
+ goto err_out_release_mdesc;
}
if ((*port_id << PARTITION_SHIFT) & ~(u64)MINORMASK) {
printk(KERN_ERR PFX "Port id [%lu] too large.\n", *port_id);
- return -ENODEV;
+ goto err_out_release_mdesc;
}
port = kzalloc(sizeof(*port), GFP_KERNEL);
+ err = -ENOMEM;
if (!port) {
printk(KERN_ERR PFX "Cannot allocate vdc_port.\n");
- return -ENOMEM;
+ goto err_out_release_mdesc;
}
port->vp = vp;
@@ -797,7 +795,7 @@ static int __devinit vdc_port_probe(struct vio_dev *vdev,
snprintf(port->disk_name, sizeof(port->disk_name),
VDCBLK_NAME "%c", 'a' + (port->dev_no % 26));
- err = vio_driver_init(&port->vio, vdev, VDEV_DISK, endp,
+ err = vio_driver_init(&port->vio, vdev, VDEV_DISK,
vdc_versions, ARRAY_SIZE(vdc_versions),
&vdc_vio_ops, port->disk_name);
if (err)
@@ -828,6 +826,8 @@ static int __devinit vdc_port_probe(struct vio_dev *vdev,
dev_set_drvdata(&vdev->dev, port);
+ mdesc_release(hp);
+
return 0;
err_out_free_tx_ring:
@@ -839,6 +839,8 @@ err_out_free_ldc:
err_out_free_port:
kfree(port);
+err_out_release_mdesc:
+ mdesc_release(hp);
return err;
}