ieee1394: regression in 2.6.25: updates should happen before probes

Regression since commit 73cf60232ef16e1f8a64defa97214a1722db1e6c,
"ieee1394: use class iteration api":  The two loops for (1.) driver
updates and (2.) driver probes were replaced by a single loop with
bogus needs_probe checks.  Hence updates and probes were now intermixed,
and especially sbp2 updates (reconnects) held up longer than necessary.

While we fix it, change the needs_probe flag to bool type for clarity.

Tested by Damien Benoist.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

2 files changed, 16 insertions, 15 deletions

diff --git a/drivers/ieee1394/nodemgr.c b/drivers/ieee1394/nodemgr.c
index 994a21e5a0aa..2ebd09a89427 100644
--- a/drivers/ieee1394/nodemgr.c
+++ b/drivers/ieee1394/nodemgr.c
@@ -844,7 +844,7 @@ static struct node_entry *nodemgr_create_node(octlet_t guid, struct csr1212_csr
         ne->host = host;
         ne->nodeid = nodeid;
         ne->generation = generation;
-        ne->needs_probe = 1;
+        ne->needs_probe = true;
 
         ne->guid = guid;
         ne->guid_vendor_id = (guid >> 40) & 0xffffff;
@@ -1144,7 +1144,7 @@ static void nodemgr_process_root_directory(struct host_info *hi, struct node_ent
         struct csr1212_keyval *kv, *vendor_name_kv = NULL;
         u8 last_key_id = 0;
 
-        ne->needs_probe = 0;
+        ne->needs_probe = false;
 
         csr1212_for_each_dir_entry(ne->csr, kv, ne->csr->root_kv, dentry) {
                 switch (kv->key.id) {
@@ -1295,7 +1295,7 @@ static void nodemgr_update_node(struct node_entry *ne, struct csr1212_csr *csr,
                 nodemgr_update_bus_options(ne);
 
                 /* Mark the node as new, so it gets re-probed */
-                ne->needs_probe = 1;
+                ne->needs_probe = true;
         } else {
                 /* old cache is valid, so update its generation */
                 struct nodemgr_csr_info *ci = ne->csr->private;
@@ -1566,28 +1566,27 @@ static void nodemgr_probe_ne(struct host_info *hi, struct node_entry *ne, int ge
 struct probe_param {
         struct host_info *hi;
         int generation;
+        bool probe_now;
 };
 
-static int __nodemgr_node_probe(struct device *dev, void *data)
+static int node_probe(struct device *dev, void *data)
 {
-        struct probe_param *param = (struct probe_param *)data;
+        struct probe_param *p = data;
         struct node_entry *ne;
 
         ne = container_of(dev, struct node_entry, node_dev);
-        if (!ne->needs_probe)
-                nodemgr_probe_ne(param->hi, ne, param->generation);
-        if (ne->needs_probe)
-                nodemgr_probe_ne(param->hi, ne, param->generation);
+        if (ne->needs_probe == p->probe_now)
+                nodemgr_probe_ne(p->hi, ne, p->generation);
         return 0;
 }
 
 static void nodemgr_node_probe(struct host_info *hi, int generation)
 {
         struct hpsb_host *host = hi->host;
-        struct probe_param param;
+        struct probe_param p;
 
-        param.hi = hi;
-        param.generation = generation;
+        p.hi = hi;
+        p.generation = generation;
         /* 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
@@ -1597,8 +1596,10 @@ static void nodemgr_node_probe(struct host_info *hi, int generation)
          * while probes are time-consuming. (Well, those probes need some
          * improvement...) */
 
-        class_for_each_device(&nodemgr_ne_class, NULL, &param,
-                              __nodemgr_node_probe);
+        p.probe_now = false;
+        class_for_each_device(&nodemgr_ne_class, NULL, &p, node_probe);
+        p.probe_now = true;
+        class_for_each_device(&nodemgr_ne_class, NULL, &p, node_probe);
 
         /* If we had a bus reset while we were scanning the bus, it is
          * possible that we did not probe all nodes.  In that case, we
diff --git a/drivers/ieee1394/nodemgr.h b/drivers/ieee1394/nodemgr.h
index 919e92e2a955..6eb26465a84c 100644
--- a/drivers/ieee1394/nodemgr.h
+++ b/drivers/ieee1394/nodemgr.h
@@ -97,7 +97,7 @@ struct node_entry {
         struct hpsb_host *host;         /* Host this node is attached to */
         nodeid_t nodeid;                /* NodeID */
         struct bus_options busopt;      /* Bus Options */
-        int needs_probe;
+        bool needs_probe;
         unsigned int generation;        /* Synced with hpsb generation */
 
         /* The following is read from the config rom */