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ieee1394: run high-level updates before high-level probes 

After a bus reset, let nodemgr call high-level update hooks first for nodes
which do not need to be probed.  The main benefit is for a bus with more
than one SBP-2 device:  SBP-2 reconnects will be performed before SBP-2
logins, thus have a much higher chance to succeed, and their SCSI devices
will not be blocked much longer than necessary.  This was demonstrated for
Linux 2.4 by Dave Cinege a while ago.

A better approach would be to perform time-consuming probes in parallel by a
subthread.  I actually plan to implement this for sbp2 but it may take a
while to get that done and tested.  Until then, this tweak is a huge
improvement for users with multiple SBP-2 devices.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jody McIntyre <scjody@modernduck.com>
This commit is contained in:
Stefan Richter 2005-12-12 23:03:19 -05:00 committed by Jody McIntyre
parent e38dc0ae24
commit 51c1d80e92
1 changed files with 17 additions and 3 deletions
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20
drivers/ieee1394/nodemgr.c
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@ -1407,14 +1407,28 @@ static void nodemgr_node_probe(struct host_info *hi, int generation)
struct hpsb_host *host = hi->host;
struct class *class = &nodemgr_ne_class;
struct class_device *cdev;
struct node_entry *ne;
/* Do some processing of the nodes we've probed. This pulls them
* into the sysfs layer if needed, and can result in processing of
* unit-directories, or just updating the node and it's
* unit-directories. */
* unit-directories.
*
* Run updates before probes. Usually, updates are time-critical
* while probes are time-consuming. (Well, those probes need some
* improvement...) */
down_read(&class->subsys.rwsem);
list_for_each_entry(cdev, &class->children, node)
nodemgr_probe_ne(hi, container_of(cdev, struct node_entry, class_dev), generation);
list_for_each_entry(cdev, &class->children, node) {
ne = container_of(cdev, struct node_entry, class_dev);
if (!ne->needs_probe)
nodemgr_probe_ne(hi, ne, generation);
}
list_for_each_entry(cdev, &class->children, node) {
ne = container_of(cdev, struct node_entry, class_dev);
if (ne->needs_probe)
nodemgr_probe_ne(hi, ne, generation);
}
up_read(&class->subsys.rwsem);