Merge commit 'v2.6.27-rc6' into core/rcu

3 files changed, 52 insertions, 38 deletions

diff --git a/drivers/ieee1394/nodemgr.c b/drivers/ieee1394/nodemgr.c
index 994a21e5a0aa..16240a789650 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;
@@ -1566,57 +1566,60 @@ 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;
 
+	if (p->generation != get_hpsb_generation(p->hi->host))
+		return -EAGAIN;
+
 	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;
-	/* Do some processing of the nodes we've probed. This pulls them
+	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
 	 * unit-directories.
 	 *
 	 * Run updates before probes. Usually, updates are time-critical
-	 * while probes are time-consuming. (Well, those probes need some
-	 * improvement...) */
-
-	class_for_each_device(&nodemgr_ne_class, NULL, &param,
-			      __nodemgr_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
-	 * skip the clean up for now, since we could remove nodes that
-	 * were still on the bus.  Another bus scan is pending which will
-	 * do the clean up eventually.
+	 * while probes are time-consuming.
 	 *
+	 * Meanwhile, another bus reset may have happened. In this case we
+	 * skip everything here and let the next bus scan handle it.
+	 * Otherwise we may prematurely remove nodes which are still there.
+	 */
+	p.probe_now = false;
+	if (class_for_each_device(&nodemgr_ne_class, NULL, &p, node_probe) != 0)
+		return;
+
+	p.probe_now = true;
+	if (class_for_each_device(&nodemgr_ne_class, NULL, &p, node_probe) != 0)
+		return;
+	/*
 	 * Now let's tell the bus to rescan our devices. This may seem
 	 * like overhead, but the driver-model core will only scan a
 	 * device for a driver when either the device is added, or when a
 	 * new driver is added. A bus reset is a good reason to rescan
 	 * devices that were there before.  For example, an sbp2 device
 	 * may become available for login, if the host that held it was
-	 * just removed.  */
-
-	if (generation == get_hpsb_generation(host))
-		if (bus_rescan_devices(&ieee1394_bus_type))
-			HPSB_DEBUG("bus_rescan_devices had an error");
+	 * just removed.
+	 */
+	if (bus_rescan_devices(&ieee1394_bus_type) != 0)
+		HPSB_DEBUG("bus_rescan_devices had an error");
 }
 
 static int nodemgr_send_resume_packet(struct hpsb_host *host)
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 */
diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c
index 9cbf3154d243..1d6ad3435537 100644
--- a/drivers/ieee1394/sbp2.c
+++ b/drivers/ieee1394/sbp2.c
@@ -731,15 +731,26 @@ static int sbp2_update(struct unit_directory *ud)
 {
 	struct sbp2_lu *lu = ud->device.driver_data;
 
-	if (sbp2_reconnect_device(lu)) {
-		/* Reconnect has failed. Perhaps we didn't reconnect fast
-		 * enough. Try a regular login, but first log out just in
-		 * case of any weirdness. */
+	if (sbp2_reconnect_device(lu) != 0) {
+		/*
+		 * Reconnect failed.  If another bus reset happened,
+		 * let nodemgr proceed and call sbp2_update again later
+		 * (or sbp2_remove if this node went away).
+		 */
+		if (!hpsb_node_entry_valid(lu->ne))
+			return 0;
+		/*
+		 * Or the target rejected the reconnect because we weren't
+		 * fast enough.  Try a regular login, but first log out
+		 * just in case of any weirdness.
+		 */
 		sbp2_logout_device(lu);
 
-		if (sbp2_login_device(lu)) {
-			/* Login failed too, just fail, and the backend
-			 * will call our sbp2_remove for us */
+		if (sbp2_login_device(lu) != 0) {
+			if (!hpsb_node_entry_valid(lu->ne))
+				return 0;
+
+			/* Maybe another initiator won the login. */
 			SBP2_ERR("Failed to reconnect to sbp2 device!");
 			return -EBUSY;
 		}