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authorNathan Fontenot <nfont@linux.vnet.ibm.com>2012-10-02 20:55:01 +0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-11-15 02:43:54 +0400
commite81b3295bc54eb0d03f4cdfc8cbf72e731d1b402 (patch)
tree562c84116ff9b969512347a6ffd326fdfe3a9592 /drivers/of
parent83dac59409387789b88bed40b1be86a8abc572be (diff)
downloadlinux-e81b3295bc54eb0d03f4cdfc8cbf72e731d1b402.tar.xz
powerpc+of: Add /proc device tree updating to of node add/remove
When adding or removing a device tree node we should also update the device tree in /proc/device-tree. This action is already done in the generic OF code for adding/removing properties of a node. This patch adds this functionality for nodes. Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com> Acked-by: Rob Herring <rob.herring@calxeda.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/base.c55
1 files changed, 51 insertions, 4 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index af3b22ac7627..bbd073f53c9f 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1160,6 +1160,22 @@ int prom_update_property(struct device_node *np,
* device tree nodes.
*/
+#ifdef CONFIG_PROC_DEVICETREE
+static void of_add_proc_dt_entry(struct device_node *dn)
+{
+ struct proc_dir_entry *ent;
+
+ ent = proc_mkdir(strrchr(dn->full_name, '/') + 1, dn->parent->pde);
+ if (ent)
+ proc_device_tree_add_node(dn, ent);
+}
+#else
+static void of_add_proc_dt_entry(struct device_node *dn)
+{
+ return;
+}
+#endif
+
/**
* of_attach_node - Plug a device node into the tree and global list.
*/
@@ -1173,8 +1189,31 @@ void of_attach_node(struct device_node *np)
np->parent->child = np;
allnodes = np;
write_unlock_irqrestore(&devtree_lock, flags);
+
+ of_add_proc_dt_entry(np);
}
+#ifdef CONFIG_PROC_DEVICETREE
+static void of_remove_proc_dt_entry(struct device_node *dn)
+{
+ struct device_node *parent = dn->parent;
+ struct property *prop = dn->properties;
+
+ while (prop) {
+ remove_proc_entry(prop->name, dn->pde);
+ prop = prop->next;
+ }
+
+ if (dn->pde)
+ remove_proc_entry(dn->pde->name, parent->pde);
+}
+#else
+static void of_remove_proc_dt_entry(struct device_node *dn)
+{
+ return;
+}
+#endif
+
/**
* of_detach_node - "Unplug" a node from the device tree.
*
@@ -1188,9 +1227,17 @@ void of_detach_node(struct device_node *np)
write_lock_irqsave(&devtree_lock, flags);
+ if (of_node_check_flag(np, OF_DETACHED)) {
+ /* someone already detached it */
+ write_unlock_irqrestore(&devtree_lock, flags);
+ return;
+ }
+
parent = np->parent;
- if (!parent)
- goto out_unlock;
+ if (!parent) {
+ write_unlock_irqrestore(&devtree_lock, flags);
+ return;
+ }
if (allnodes == np)
allnodes = np->allnext;
@@ -1215,9 +1262,9 @@ void of_detach_node(struct device_node *np)
}
of_node_set_flag(np, OF_DETACHED);
-
-out_unlock:
write_unlock_irqrestore(&devtree_lock, flags);
+
+ of_remove_proc_dt_entry(np);
}
#endif /* defined(CONFIG_OF_DYNAMIC) */