From c05aba2bd5f9dd3f363611ff844513de1341ac60 Mon Sep 17 00:00:00 2001 From: Pantelis Antoniou Date: Fri, 4 Jul 2014 19:58:03 +0300 Subject: of: rename of_aliases_mutex to just of_mutex We're overloading usage of of_aliases_mutex for sysfs changes, so rename to something that is more generic. Signed-off-by: Pantelis Antoniou Signed-off-by: Grant Likely --- drivers/of/base.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) (limited to 'drivers/of/base.c') diff --git a/drivers/of/base.c b/drivers/of/base.c index b986480..e48a1b9 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -40,10 +40,9 @@ static struct device_node *of_stdout; static struct kset *of_kset; /* - * Used to protect the of_aliases; but also overloaded to hold off addition of - * nodes to sysfs + * Used to protect the of_aliases, to hold off addition of nodes to sysfs */ -DEFINE_MUTEX(of_aliases_mutex); +DEFINE_MUTEX(of_mutex); /* use when traversing tree through the allnext, child, sibling, * or parent members of struct device_node. @@ -255,13 +254,13 @@ int of_node_add(struct device_node *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); + mutex_lock(&of_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); + mutex_unlock(&of_mutex); return rc; } @@ -289,15 +288,15 @@ static int __init of_init(void) struct device_node *np; /* Create the kset, and register existing nodes */ - mutex_lock(&of_aliases_mutex); + mutex_lock(&of_mutex); of_kset = kset_create_and_add("devicetree", NULL, firmware_kobj); if (!of_kset) { - mutex_unlock(&of_aliases_mutex); + mutex_unlock(&of_mutex); return -ENOMEM; } for_each_of_allnodes(np) __of_node_add(np); - mutex_unlock(&of_aliases_mutex); + mutex_unlock(&of_mutex); /* Symlink in /proc as required by userspace ABI */ if (of_allnodes) @@ -2122,7 +2121,7 @@ int of_alias_get_id(struct device_node *np, const char *stem) struct alias_prop *app; int id = -ENODEV; - mutex_lock(&of_aliases_mutex); + mutex_lock(&of_mutex); list_for_each_entry(app, &aliases_lookup, link) { if (strcmp(app->stem, stem) != 0) continue; @@ -2132,7 +2131,7 @@ int of_alias_get_id(struct device_node *np, const char *stem) break; } } - mutex_unlock(&of_aliases_mutex); + mutex_unlock(&of_mutex); return id; } -- cgit v1.1 From 6afc0dc381573559251de9a8259404f49e6aed14 Mon Sep 17 00:00:00 2001 From: Grant Likely Date: Thu, 26 Jun 2014 15:40:48 +0100 Subject: of: Move CONFIG_OF_DYNAMIC code into a separate file Split the dynamic device tree code into a separate file to make it really clear what features CONFIF_OF_DYNAMIC add to the kernel. Without CONFIG_OF_DYNAMIC only properties can be changed, and notifiers do not get sent. Enabling it turns on reference counting, notifiers and the ability to add and remove nodes. v2: Moved of_node_release() into dynamic.c Signed-off-by: Grant Likely Signed-off-by: Pantelis Antoniou Cc: Rob Herring --- drivers/of/base.c | 230 +----------------------------------------------------- 1 file changed, 1 insertion(+), 229 deletions(-) (limited to 'drivers/of/base.c') diff --git a/drivers/of/base.c b/drivers/of/base.c index e48a1b9..0d89556 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -88,79 +88,7 @@ int __weak of_node_to_nid(struct device_node *np) } #endif -#if defined(CONFIG_OF_DYNAMIC) -/** - * of_node_get - Increment refcount of a node - * @node: Node to inc refcount, NULL is supported to - * simplify writing of callers - * - * Returns node. - */ -struct device_node *of_node_get(struct device_node *node) -{ - if (node) - kobject_get(&node->kobj); - return node; -} -EXPORT_SYMBOL(of_node_get); - -static inline struct device_node *kobj_to_device_node(struct kobject *kobj) -{ - return container_of(kobj, struct device_node, kobj); -} - -/** - * of_node_release - release a dynamically allocated node - * @kref: kref element of the node to be released - * - * In of_node_put() this function is passed to kref_put() - * as the destructor. - */ -static void of_node_release(struct kobject *kobj) -{ - struct device_node *node = kobj_to_device_node(kobj); - struct property *prop = node->properties; - - /* We should never be releasing nodes that haven't been detached. */ - if (!of_node_check_flag(node, OF_DETACHED)) { - pr_err("ERROR: Bad of_node_put() on %s\n", node->full_name); - dump_stack(); - return; - } - - if (!of_node_check_flag(node, OF_DYNAMIC)) - return; - - while (prop) { - struct property *next = prop->next; - kfree(prop->name); - kfree(prop->value); - kfree(prop); - prop = next; - - if (!prop) { - prop = node->deadprops; - node->deadprops = NULL; - } - } - kfree(node->full_name); - kfree(node->data); - kfree(node); -} - -/** - * of_node_put - Decrement refcount of a node - * @node: Node to dec refcount, NULL is supported to - * simplify writing of callers - * - */ -void of_node_put(struct device_node *node) -{ - if (node) - kobject_put(&node->kobj); -} -EXPORT_SYMBOL(of_node_put); -#else +#ifndef CONFIG_OF_DYNAMIC static void of_node_release(struct kobject *kobj) { /* Without CONFIG_OF_DYNAMIC, no nodes gets freed */ @@ -264,25 +192,6 @@ int of_node_add(struct device_node *np) return rc; } -#if defined(CONFIG_OF_DYNAMIC) -static void of_node_remove(struct device_node *np) -{ - struct property *pp; - - 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); - } - - /* finally remove the kobj_init ref */ - of_node_put(np); -} -#endif - static int __init of_init(void) { struct device_node *np; @@ -1747,28 +1656,6 @@ int of_count_phandle_with_args(const struct device_node *np, const char *list_na } EXPORT_SYMBOL(of_count_phandle_with_args); -#if defined(CONFIG_OF_DYNAMIC) -static int of_property_notify(int action, struct device_node *np, - struct property *prop) -{ - 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); -} -#else -static int of_property_notify(int action, struct device_node *np, - struct property *prop) -{ - return 0; -} -#endif - /** * __of_add_property - Add a property to a node without lock operations */ @@ -1915,121 +1802,6 @@ int of_update_property(struct device_node *np, struct property *newprop) return 0; } -#if defined(CONFIG_OF_DYNAMIC) -/* - * Support for dynamic device trees. - * - * On some platforms, the device tree can be manipulated at runtime. - * The routines in this section support adding, removing and changing - * device tree nodes. - */ - -static BLOCKING_NOTIFIER_HEAD(of_reconfig_chain); - -int of_reconfig_notifier_register(struct notifier_block *nb) -{ - return blocking_notifier_chain_register(&of_reconfig_chain, nb); -} -EXPORT_SYMBOL_GPL(of_reconfig_notifier_register); - -int of_reconfig_notifier_unregister(struct notifier_block *nb) -{ - return blocking_notifier_chain_unregister(&of_reconfig_chain, nb); -} -EXPORT_SYMBOL_GPL(of_reconfig_notifier_unregister); - -int of_reconfig_notify(unsigned long action, void *p) -{ - int rc; - - rc = blocking_notifier_call_chain(&of_reconfig_chain, action, p); - return notifier_to_errno(rc); -} - -/** - * of_attach_node - Plug a device node into the tree and global list. - */ -int of_attach_node(struct device_node *np) -{ - unsigned long flags; - int rc; - - rc = of_reconfig_notify(OF_RECONFIG_ATTACH_NODE, np); - if (rc) - return rc; - - raw_spin_lock_irqsave(&devtree_lock, flags); - np->sibling = np->parent->child; - np->allnext = np->parent->allnext; - np->parent->allnext = np; - np->parent->child = np; - of_node_clear_flag(np, OF_DETACHED); - raw_spin_unlock_irqrestore(&devtree_lock, flags); - - of_node_add(np); - return 0; -} - -/** - * of_detach_node - "Unplug" a node from the device tree. - * - * The caller must hold a reference to the node. The memory associated with - * the node is not freed until its refcount goes to zero. - */ -int of_detach_node(struct device_node *np) -{ - struct device_node *parent; - unsigned long flags; - int rc = 0; - - rc = of_reconfig_notify(OF_RECONFIG_DETACH_NODE, np); - if (rc) - return rc; - - raw_spin_lock_irqsave(&devtree_lock, flags); - - if (of_node_check_flag(np, OF_DETACHED)) { - /* someone already detached it */ - raw_spin_unlock_irqrestore(&devtree_lock, flags); - return rc; - } - - parent = np->parent; - if (!parent) { - raw_spin_unlock_irqrestore(&devtree_lock, flags); - return rc; - } - - if (of_allnodes == np) - of_allnodes = np->allnext; - else { - struct device_node *prev; - for (prev = of_allnodes; - prev->allnext != np; - prev = prev->allnext) - ; - prev->allnext = np->allnext; - } - - if (parent->child == np) - parent->child = np->sibling; - else { - struct device_node *prevsib; - for (prevsib = np->parent->child; - prevsib->sibling != np; - prevsib = prevsib->sibling) - ; - prevsib->sibling = np->sibling; - } - - of_node_set_flag(np, OF_DETACHED); - raw_spin_unlock_irqrestore(&devtree_lock, flags); - - of_node_remove(np); - return rc; -} -#endif /* defined(CONFIG_OF_DYNAMIC) */ - static void of_alias_add(struct alias_prop *ap, struct device_node *np, int id, const char *stem, int stem_len) { -- cgit v1.1 From d8c50088417ebf61ad8b132caad20d10f7736034 Mon Sep 17 00:00:00 2001 From: Pantelis Antoniou Date: Fri, 4 Jul 2014 19:58:46 +0300 Subject: of: Create unlocked versions of node and property add/remove functions The DT overlay code will need to manipulate nodes and properties while already holding the devicetree lock, or on nodes that are not yet attached to the tree, but the current helper functions don't allow that. Extract the core behaviour from the accessors and create the following unlocked variants. The unlocked variants require either the lock to already be held or for the nodes to be detached from the tree. Changes to live nodes will not get updated in sysfs, so the caller must arrange for housekeeping to take place after dropping the lock. The new functions are: __of_add_property(), __of_remove_property(), __of_update_property(), __of_attach_node() and __of_detach_node(). Signed-off-by: Pantelis Antoniou [Remove unnecessary diff hunks and rewrite commit text] Signed-off-by: Grant Likely --- drivers/of/base.c | 91 +++++++++++++++++++++++++++++++++---------------------- 1 file changed, 54 insertions(+), 37 deletions(-) (limited to 'drivers/of/base.c') diff --git a/drivers/of/base.c b/drivers/of/base.c index 0d89556..b403f9d 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -1659,7 +1659,7 @@ EXPORT_SYMBOL(of_count_phandle_with_args); /** * __of_add_property - Add a property to a node without lock operations */ -static int __of_add_property(struct device_node *np, struct property *prop) +int __of_add_property(struct device_node *np, struct property *prop) { struct property **next; @@ -1701,6 +1701,25 @@ int of_add_property(struct device_node *np, struct property *prop) return rc; } +int __of_remove_property(struct device_node *np, struct property *prop) +{ + struct property **next; + + for (next = &np->properties; *next; next = &(*next)->next) { + if (*next == prop) + break; + } + if (*next == NULL) + return -ENODEV; + + /* found the node */ + *next = prop->next; + prop->next = np->deadprops; + np->deadprops = prop; + + return 0; +} + /** * of_remove_property - Remove a property from a node. * @@ -1711,9 +1730,7 @@ int of_add_property(struct device_node *np, struct property *prop) */ int of_remove_property(struct device_node *np, struct property *prop) { - struct property **next; unsigned long flags; - int found = 0; int rc; rc = of_property_notify(OF_RECONFIG_REMOVE_PROPERTY, np, prop); @@ -1721,22 +1738,11 @@ int of_remove_property(struct device_node *np, struct property *prop) return rc; raw_spin_lock_irqsave(&devtree_lock, flags); - next = &np->properties; - while (*next) { - if (*next == prop) { - /* found the node */ - *next = prop->next; - prop->next = np->deadprops; - np->deadprops = prop; - found = 1; - break; - } - next = &(*next)->next; - } + rc = __of_remove_property(np, prop); raw_spin_unlock_irqrestore(&devtree_lock, flags); - if (!found) - return -ENODEV; + if (rc) + return rc; /* at early boot, bail hear and defer setup to of_init() */ if (!of_kset) @@ -1747,6 +1753,32 @@ int of_remove_property(struct device_node *np, struct property *prop) return 0; } +int __of_update_property(struct device_node *np, struct property *newprop, + struct property **oldpropp) +{ + struct property **next, *oldprop; + + for (next = &np->properties; *next; next = &(*next)->next) { + if (of_prop_cmp((*next)->name, newprop->name) == 0) + break; + } + *oldpropp = oldprop = *next; + + if (oldprop) { + /* replace the node */ + newprop->next = oldprop->next; + *next = newprop; + oldprop->next = np->deadprops; + np->deadprops = oldprop; + } else { + /* new node */ + newprop->next = NULL; + *next = newprop; + } + + return 0; +} + /* * of_update_property - Update a property in a node, if the property does * not exist, add it. @@ -1758,34 +1790,19 @@ int of_remove_property(struct device_node *np, struct property *prop) */ int of_update_property(struct device_node *np, struct property *newprop) { - struct property **next, *oldprop; + struct property *oldprop; unsigned long flags; int rc; + if (!newprop->name) + return -EINVAL; + rc = of_property_notify(OF_RECONFIG_UPDATE_PROPERTY, np, newprop); if (rc) return rc; - if (!newprop->name) - return -EINVAL; - raw_spin_lock_irqsave(&devtree_lock, flags); - next = &np->properties; - oldprop = __of_find_property(np, newprop->name, NULL); - if (!oldprop) { - /* add the new node */ - rc = __of_add_property(np, newprop); - } else while (*next) { - /* replace the node */ - if (*next == oldprop) { - newprop->next = oldprop->next; - *next = newprop; - oldprop->next = np->deadprops; - np->deadprops = oldprop; - break; - } - next = &(*next)->next; - } + rc = __of_update_property(np, newprop, &oldprop); raw_spin_unlock_irqrestore(&devtree_lock, flags); if (rc) return rc; -- cgit v1.1 From 8a2b22a2595bf89d4396530edf8388159fad9d83 Mon Sep 17 00:00:00 2001 From: Grant Likely Date: Wed, 23 Jul 2014 17:05:06 -0600 Subject: of: Make devicetree sysfs update functions consistent. All of the DT modification functions are split into two parts, the first part manipulates the DT data structure, and the second part updates sysfs, but the code isn't very consistent about how the second half is called. They don't all enforce the same rules about when it is valid to update sysfs, and there isn't any clarity on locking. The transactional DT modification feature that is coming also needs access to these functions so that it can perform all the structure changes together, and then all the sysfs updates as a second stage instead of doing each one at a time. Fix up the second have by creating a separate __of_*_sysfs() function for each of the helpers. The new functions have consistent naming (ie. of_node_add() becomes __of_attach_node_sysfs()) and all of them now defer if of_init hasn't been called yet. Callers of the new functions must hold the of_mutex to ensure there are no race conditions with of_init(). The mutex ensures that there will only ever be one writer to the tree at any given time. There can still be any number of readers and the raw_spin_lock is still used to make sure access to the data structure is still consistent. Finally, put the function prototypes into of_private.h so they are accessible to the transaction code. Signed-off-by: Pantelis Antoniou [grant.likely: Changed suffix from _post to _sysfs to match existing code] [grant.likely: Reorganized to eliminate trivial wrappers] Signed-off-by: Grant Likely --- drivers/of/base.c | 96 +++++++++++++++++++++++++++++-------------------------- 1 file changed, 50 insertions(+), 46 deletions(-) (limited to 'drivers/of/base.c') diff --git a/drivers/of/base.c b/drivers/of/base.c index b403f9d..ad4929c 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -37,10 +37,13 @@ struct device_node *of_chosen; struct device_node *of_aliases; static struct device_node *of_stdout; -static struct kset *of_kset; +struct kset *of_kset; /* - * Used to protect the of_aliases, to hold off addition of nodes to sysfs + * Used to protect the of_aliases, to hold off addition of nodes to sysfs. + * This mutex must be held whenever modifications are being made to the + * device tree. The of_{attach,detach}_node() and + * of_{add,remove,update}_property() helpers make sure this happens. */ DEFINE_MUTEX(of_mutex); @@ -127,13 +130,16 @@ static const char *safe_name(struct kobject *kobj, const char *orig_name) return name; } -static int __of_add_property_sysfs(struct device_node *np, struct property *pp) +int __of_add_property_sysfs(struct device_node *np, struct property *pp) { int rc; /* Important: Don't leak passwords */ bool secure = strncmp(pp->name, "security-", 9) == 0; + if (!of_kset || !of_node_is_attached(np)) + return 0; + sysfs_bin_attr_init(&pp->attr); pp->attr.attr.name = safe_name(&np->kobj, pp->name); pp->attr.attr.mode = secure ? S_IRUSR : S_IRUGO; @@ -145,12 +151,15 @@ static int __of_add_property_sysfs(struct device_node *np, struct property *pp) return rc; } -static int __of_node_add(struct device_node *np) +int __of_attach_node_sysfs(struct device_node *np) { const char *name; struct property *pp; int rc; + if (!of_kset) + return 0; + np->kobj.kset = of_kset; if (!np->parent) { /* Nodes without parents are new top level trees */ @@ -172,26 +181,6 @@ static int __of_node_add(struct device_node *np) return 0; } -int of_node_add(struct device_node *np) -{ - int rc = 0; - - 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_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_mutex); - return rc; -} - static int __init of_init(void) { struct device_node *np; @@ -204,7 +193,7 @@ static int __init of_init(void) return -ENOMEM; } for_each_of_allnodes(np) - __of_node_add(np); + __of_attach_node_sysfs(np); mutex_unlock(&of_mutex); /* Symlink in /proc as required by userspace ABI */ @@ -1689,15 +1678,17 @@ int of_add_property(struct device_node *np, struct property *prop) if (rc) return rc; + mutex_lock(&of_mutex); + raw_spin_lock_irqsave(&devtree_lock, flags); rc = __of_add_property(np, prop); raw_spin_unlock_irqrestore(&devtree_lock, flags); - if (rc) - return rc; - if (of_node_is_attached(np)) + if (!rc) __of_add_property_sysfs(np, prop); + mutex_unlock(&of_mutex); + return rc; } @@ -1720,6 +1711,13 @@ int __of_remove_property(struct device_node *np, struct property *prop) return 0; } +void __of_remove_property_sysfs(struct device_node *np, struct property *prop) +{ + /* at early boot, bail here and defer setup to of_init() */ + if (of_kset && of_node_is_attached(np)) + sysfs_remove_bin_file(&np->kobj, &prop->attr); +} + /** * of_remove_property - Remove a property from a node. * @@ -1737,20 +1735,18 @@ int of_remove_property(struct device_node *np, struct property *prop) if (rc) return rc; + mutex_lock(&of_mutex); + raw_spin_lock_irqsave(&devtree_lock, flags); rc = __of_remove_property(np, prop); raw_spin_unlock_irqrestore(&devtree_lock, flags); - if (rc) - return rc; - - /* at early boot, bail hear and defer setup to of_init() */ - if (!of_kset) - return 0; + if (!rc) + __of_remove_property_sysfs(np, prop); - sysfs_remove_bin_file(&np->kobj, &prop->attr); + mutex_unlock(&of_mutex); - return 0; + return rc; } int __of_update_property(struct device_node *np, struct property *newprop, @@ -1779,6 +1775,18 @@ int __of_update_property(struct device_node *np, struct property *newprop, return 0; } +void __of_update_property_sysfs(struct device_node *np, struct property *newprop, + struct property *oldprop) +{ + /* At early boot, bail out and defer setup to of_init() */ + if (!of_kset) + return; + + if (oldprop) + sysfs_remove_bin_file(&np->kobj, &oldprop->attr); + __of_add_property_sysfs(np, newprop); +} + /* * of_update_property - Update a property in a node, if the property does * not exist, add it. @@ -1801,22 +1809,18 @@ int of_update_property(struct device_node *np, struct property *newprop) if (rc) return rc; + mutex_lock(&of_mutex); + raw_spin_lock_irqsave(&devtree_lock, flags); rc = __of_update_property(np, newprop, &oldprop); raw_spin_unlock_irqrestore(&devtree_lock, flags); - if (rc) - return rc; - /* At early boot, bail out and defer setup to of_init() */ - if (!of_kset) - return 0; + if (!rc) + __of_update_property_sysfs(np, newprop, oldprop); - /* Update the sysfs attribute */ - if (oldprop) - sysfs_remove_bin_file(&np->kobj, &oldprop->attr); - __of_add_property_sysfs(np, newprop); + mutex_unlock(&of_mutex); - return 0; + return rc; } static void of_alias_add(struct alias_prop *ap, struct device_node *np, -- cgit v1.1 From a25095d451ece23b1fef34474f3230100db7aa05 Mon Sep 17 00:00:00 2001 From: Grant Likely Date: Tue, 15 Jul 2014 23:25:43 -0600 Subject: of: Move dynamic node fixups out of powerpc and into common code PowerPC does an odd thing with dynamic nodes. It uses a notifier to catch new node additions and set some of the values like name and type. This makes no sense since that same code can be put directly into of_attach_node(). Besides, all dynamic node users need this, not just powerpc. Fix this problem by moving the logic out of arch/powerpc and into drivers/of/dynamic.c. It is also important to remove this notifier because we want to move the firing of notifiers from before the tree is modified to after so that the receiver gets a consistent view of the tree, but that is incompatible with notifiers that modify the node. Signed-off-by: Grant Likely Cc: Nathan Fontenot Cc: Benjamin Herrenschmidt --- drivers/of/base.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/of/base.c') diff --git a/drivers/of/base.c b/drivers/of/base.c index ad4929c..ededf8e 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -266,8 +266,8 @@ EXPORT_SYMBOL(of_find_all_nodes); * Find a property with a given name for a given node * and return the value. */ -static const void *__of_get_property(const struct device_node *np, - const char *name, int *lenp) +const void *__of_get_property(const struct device_node *np, + const char *name, int *lenp) { struct property *pp = __of_find_property(np, name, lenp); -- cgit v1.1 From 259092a35c7e11f1d4616b0f5b3ba7b851fe4fa6 Mon Sep 17 00:00:00 2001 From: Grant Likely Date: Wed, 16 Jul 2014 12:48:23 -0600 Subject: of: Reorder device tree changes and notifiers Currently, devicetree reconfig notifiers get emitted before the change is applied to the tree, but that behaviour is problematic if the receiver wants the determine the new state of the tree. The current users don't care, but the changeset code to follow will be making multiple changes at once. Reorder notifiers to get emitted after the change has been applied to the tree so that callbacks see the new tree state. At the same time, fixup the existing callbacks to expect the new order. There are a few callbacks that compare the old and new values of a changed property. Put both property pointers into the of_prop_reconfig structure. The current notifiers also allow the notifier callback to fail and cancel the change to the tree, but that feature isn't actually used. It really isn't valid to ignore a tree modification provided by firmware anyway, so remove the ability to cancel a change to the tree. Signed-off-by: Grant Likely Cc: Nathan Fontenot --- drivers/of/base.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) (limited to 'drivers/of/base.c') diff --git a/drivers/of/base.c b/drivers/of/base.c index ededf8e..a7ad101 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -1674,10 +1674,6 @@ int of_add_property(struct device_node *np, struct property *prop) unsigned long flags; int rc; - rc = of_property_notify(OF_RECONFIG_ADD_PROPERTY, np, prop); - if (rc) - return rc; - mutex_lock(&of_mutex); raw_spin_lock_irqsave(&devtree_lock, flags); @@ -1689,6 +1685,9 @@ int of_add_property(struct device_node *np, struct property *prop) mutex_unlock(&of_mutex); + if (!rc) + of_property_notify(OF_RECONFIG_ADD_PROPERTY, np, prop, NULL); + return rc; } @@ -1731,10 +1730,6 @@ int of_remove_property(struct device_node *np, struct property *prop) unsigned long flags; int rc; - rc = of_property_notify(OF_RECONFIG_REMOVE_PROPERTY, np, prop); - if (rc) - return rc; - mutex_lock(&of_mutex); raw_spin_lock_irqsave(&devtree_lock, flags); @@ -1746,6 +1741,9 @@ int of_remove_property(struct device_node *np, struct property *prop) mutex_unlock(&of_mutex); + if (!rc) + of_property_notify(OF_RECONFIG_REMOVE_PROPERTY, np, prop, NULL); + return rc; } @@ -1805,10 +1803,6 @@ int of_update_property(struct device_node *np, struct property *newprop) if (!newprop->name) return -EINVAL; - rc = of_property_notify(OF_RECONFIG_UPDATE_PROPERTY, np, newprop); - if (rc) - return rc; - mutex_lock(&of_mutex); raw_spin_lock_irqsave(&devtree_lock, flags); @@ -1820,6 +1814,9 @@ int of_update_property(struct device_node *np, struct property *newprop) mutex_unlock(&of_mutex); + if (!rc) + of_property_notify(OF_RECONFIG_UPDATE_PROPERTY, np, newprop, oldprop); + return rc; } -- cgit v1.1