diff options
| -rw-r--r-- | drivers/of/base.c | 35 | ||||
| -rw-r--r-- | drivers/of/fdt.c | 3 | ||||
| -rw-r--r-- | drivers/of/pdt.c | 3 | ||||
| -rw-r--r-- | include/linux/of.h | 19 |
4 files changed, 47 insertions, 13 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index ed3e70b8495..418a4ff9d97 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -246,10 +246,19 @@ static int __of_node_add(struct device_node *np) int of_node_add(struct device_node *np) { int rc = 0; - kobject_init(&np->kobj, &of_node_ktype); + + BUG_ON(!of_node_is_initialized(np)); + + /* + * Grab the mutex here so that in a race condition between of_init() and + * of_node_add(), node addition will still be consistent. + */ mutex_lock(&of_aliases_mutex); if (of_kset) rc = __of_node_add(np); + else + /* This scenario may be perfectly valid, but report it anyway */ + pr_info("of_node_add(%s) before of_init()\n", np->full_name); mutex_unlock(&of_aliases_mutex); return rc; } @@ -259,10 +268,17 @@ static void of_node_remove(struct device_node *np) { struct property *pp; - for_each_property_of_node(np, pp) - sysfs_remove_bin_file(&np->kobj, &pp->attr); + BUG_ON(!of_node_is_initialized(np)); + + /* only remove properties if on sysfs */ + if (of_node_is_attached(np)) { + for_each_property_of_node(np, pp) + sysfs_remove_bin_file(&np->kobj, &pp->attr); + kobject_del(&np->kobj); + } - kobject_del(&np->kobj); + /* finally remove the kobj_init ref */ + of_node_put(np); } #endif @@ -1631,6 +1647,10 @@ static int of_property_notify(int action, struct device_node *np, { struct of_prop_reconfig pr; + /* only call notifiers if the node is attached */ + if (!of_node_is_attached(np)) + return 0; + pr.dn = np; pr.prop = prop; return of_reconfig_notify(action, &pr); @@ -1682,11 +1702,8 @@ int of_add_property(struct device_node *np, struct property *prop) if (rc) return rc; - /* at early boot, bail hear and defer setup to of_init() */ - if (!of_kset) - return 0; - - __of_add_property_sysfs(np, prop); + if (of_node_is_attached(np)) + __of_add_property_sysfs(np, prop); return rc; } diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 96ad1ab7f9d..70ccc36513e 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -202,6 +202,7 @@ static void * unflatten_dt_node(struct boot_param_header *blob, __alignof__(struct device_node)); if (allnextpp) { char *fn; + of_node_init(np); np->full_name = fn = ((char *)np) + sizeof(*np); if (new_format) { /* rebuild full path for new format */ @@ -326,8 +327,6 @@ static void * unflatten_dt_node(struct boot_param_header *blob, np->name = "<NULL>"; if (!np->type) np->type = "<NULL>"; - - of_node_add(np); } while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) { if (tag == OF_DT_NOP) diff --git a/drivers/of/pdt.c b/drivers/of/pdt.c index e64fa3d3da5..36b4035881b 100644 --- a/drivers/of/pdt.c +++ b/drivers/of/pdt.c @@ -176,6 +176,7 @@ static struct device_node * __init of_pdt_create_node(phandle node, return NULL; dp = prom_early_alloc(sizeof(*dp)); + of_node_init(dp); of_pdt_incr_unique_id(dp); dp->parent = parent; @@ -213,7 +214,6 @@ static struct device_node * __init of_pdt_build_tree(struct device_node *parent, *nextp = &dp->allnext; dp->full_name = of_pdt_build_full_name(dp); - of_node_add(dp); dp->child = of_pdt_build_tree(dp, of_pdt_prom_ops->getchild(node), nextp); @@ -244,7 +244,6 @@ void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops) of_allnodes->path_component_name = ""; #endif of_allnodes->full_name = "/"; - of_node_add(of_allnodes); nextp = &of_allnodes->allnext; of_allnodes->child = of_pdt_build_tree(of_allnodes, diff --git a/include/linux/of.h b/include/linux/of.h index 257994a420f..a8b9dad90c6 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -76,6 +76,25 @@ struct of_phandle_args { extern int of_node_add(struct device_node *node); +/* initialize a node */ +extern struct kobj_type of_node_ktype; +static inline void of_node_init(struct device_node *node) +{ + kobject_init(&node->kobj, &of_node_ktype); +} + +/* true when node is initialized */ +static inline int of_node_is_initialized(struct device_node *node) +{ + return node && node->kobj.state_initialized; +} + +/* true when node is attached (i.e. present on sysfs) */ +static inline int of_node_is_attached(struct device_node *node) +{ + return node && node->kobj.state_in_sysfs; +} + #ifdef CONFIG_OF_DYNAMIC extern struct device_node *of_node_get(struct device_node *node); extern void of_node_put(struct device_node *node); |