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![Rob Herring](/assets/img/avatar_default.png)
Clean-up all the DT printk functions to use common pr_fmt prefix. Some print statements such as kmalloc errors were redundant, so just drop those. Cc: Frank Rowand <frowand.list@gmail.com> Cc: Pantelis Antoniou <pantelis.antoniou@konsulko.com> Reviewed-by: Frank Rowand <frank.rowand@am.sony.com> Signed-off-by: Rob Herring <robh@kernel.org>
815 lines
20 KiB
C
815 lines
20 KiB
C
/*
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* Support for dynamic device trees.
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*
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* On some platforms, the device tree can be manipulated at runtime.
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* The routines in this section support adding, removing and changing
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* device tree nodes.
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*/
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#define pr_fmt(fmt) "OF: " fmt
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#include <linux/of.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/proc_fs.h>
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#include "of_private.h"
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/**
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* of_node_get() - Increment refcount of a node
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* @node: Node to inc refcount, NULL is supported to simplify writing of
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* callers
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*
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* Returns node.
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*/
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struct device_node *of_node_get(struct device_node *node)
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{
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if (node)
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kobject_get(&node->kobj);
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return node;
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}
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EXPORT_SYMBOL(of_node_get);
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/**
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* of_node_put() - Decrement refcount of a node
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* @node: Node to dec refcount, NULL is supported to simplify writing of
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* callers
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*/
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void of_node_put(struct device_node *node)
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{
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if (node)
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kobject_put(&node->kobj);
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}
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EXPORT_SYMBOL(of_node_put);
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void __of_detach_node_sysfs(struct device_node *np)
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{
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struct property *pp;
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if (!IS_ENABLED(CONFIG_SYSFS))
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return;
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BUG_ON(!of_node_is_initialized(np));
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if (!of_kset)
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return;
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/* only remove properties if on sysfs */
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if (of_node_is_attached(np)) {
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for_each_property_of_node(np, pp)
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__of_sysfs_remove_bin_file(np, pp);
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kobject_del(&np->kobj);
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}
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/* finally remove the kobj_init ref */
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of_node_put(np);
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}
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static BLOCKING_NOTIFIER_HEAD(of_reconfig_chain);
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int of_reconfig_notifier_register(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&of_reconfig_chain, nb);
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}
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EXPORT_SYMBOL_GPL(of_reconfig_notifier_register);
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int of_reconfig_notifier_unregister(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&of_reconfig_chain, nb);
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}
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EXPORT_SYMBOL_GPL(of_reconfig_notifier_unregister);
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#ifdef DEBUG
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const char *action_names[] = {
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[OF_RECONFIG_ATTACH_NODE] = "ATTACH_NODE",
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[OF_RECONFIG_DETACH_NODE] = "DETACH_NODE",
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[OF_RECONFIG_ADD_PROPERTY] = "ADD_PROPERTY",
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[OF_RECONFIG_REMOVE_PROPERTY] = "REMOVE_PROPERTY",
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[OF_RECONFIG_UPDATE_PROPERTY] = "UPDATE_PROPERTY",
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};
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#endif
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int of_reconfig_notify(unsigned long action, struct of_reconfig_data *p)
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{
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int rc;
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#ifdef DEBUG
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struct of_reconfig_data *pr = p;
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switch (action) {
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case OF_RECONFIG_ATTACH_NODE:
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case OF_RECONFIG_DETACH_NODE:
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pr_debug("notify %-15s %s\n", action_names[action],
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pr->dn->full_name);
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break;
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case OF_RECONFIG_ADD_PROPERTY:
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case OF_RECONFIG_REMOVE_PROPERTY:
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case OF_RECONFIG_UPDATE_PROPERTY:
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pr_debug("notify %-15s %s:%s\n", action_names[action],
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pr->dn->full_name, pr->prop->name);
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break;
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}
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#endif
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rc = blocking_notifier_call_chain(&of_reconfig_chain, action, p);
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return notifier_to_errno(rc);
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}
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/*
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* of_reconfig_get_state_change() - Returns new state of device
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* @action - action of the of notifier
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* @arg - argument of the of notifier
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*
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* Returns the new state of a device based on the notifier used.
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* Returns 0 on device going from enabled to disabled, 1 on device
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* going from disabled to enabled and -1 on no change.
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*/
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int of_reconfig_get_state_change(unsigned long action, struct of_reconfig_data *pr)
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{
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struct property *prop, *old_prop = NULL;
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int is_status, status_state, old_status_state, prev_state, new_state;
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/* figure out if a device should be created or destroyed */
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switch (action) {
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case OF_RECONFIG_ATTACH_NODE:
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case OF_RECONFIG_DETACH_NODE:
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prop = of_find_property(pr->dn, "status", NULL);
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break;
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case OF_RECONFIG_ADD_PROPERTY:
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case OF_RECONFIG_REMOVE_PROPERTY:
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prop = pr->prop;
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break;
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case OF_RECONFIG_UPDATE_PROPERTY:
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prop = pr->prop;
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old_prop = pr->old_prop;
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break;
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default:
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return OF_RECONFIG_NO_CHANGE;
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}
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is_status = 0;
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status_state = -1;
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old_status_state = -1;
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prev_state = -1;
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new_state = -1;
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if (prop && !strcmp(prop->name, "status")) {
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is_status = 1;
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status_state = !strcmp(prop->value, "okay") ||
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!strcmp(prop->value, "ok");
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if (old_prop)
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old_status_state = !strcmp(old_prop->value, "okay") ||
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!strcmp(old_prop->value, "ok");
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}
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switch (action) {
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case OF_RECONFIG_ATTACH_NODE:
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prev_state = 0;
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/* -1 & 0 status either missing or okay */
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new_state = status_state != 0;
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break;
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case OF_RECONFIG_DETACH_NODE:
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/* -1 & 0 status either missing or okay */
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prev_state = status_state != 0;
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new_state = 0;
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break;
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case OF_RECONFIG_ADD_PROPERTY:
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if (is_status) {
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/* no status property -> enabled (legacy) */
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prev_state = 1;
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new_state = status_state;
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}
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break;
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case OF_RECONFIG_REMOVE_PROPERTY:
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if (is_status) {
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prev_state = status_state;
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/* no status property -> enabled (legacy) */
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new_state = 1;
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}
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break;
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case OF_RECONFIG_UPDATE_PROPERTY:
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if (is_status) {
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prev_state = old_status_state != 0;
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new_state = status_state != 0;
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}
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break;
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}
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if (prev_state == new_state)
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return OF_RECONFIG_NO_CHANGE;
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return new_state ? OF_RECONFIG_CHANGE_ADD : OF_RECONFIG_CHANGE_REMOVE;
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}
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EXPORT_SYMBOL_GPL(of_reconfig_get_state_change);
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int of_property_notify(int action, struct device_node *np,
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struct property *prop, struct property *oldprop)
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{
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struct of_reconfig_data pr;
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/* only call notifiers if the node is attached */
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if (!of_node_is_attached(np))
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return 0;
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pr.dn = np;
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pr.prop = prop;
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pr.old_prop = oldprop;
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return of_reconfig_notify(action, &pr);
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}
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void __of_attach_node(struct device_node *np)
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{
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const __be32 *phandle;
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int sz;
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np->name = __of_get_property(np, "name", NULL) ? : "<NULL>";
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np->type = __of_get_property(np, "device_type", NULL) ? : "<NULL>";
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phandle = __of_get_property(np, "phandle", &sz);
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if (!phandle)
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phandle = __of_get_property(np, "linux,phandle", &sz);
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if (IS_ENABLED(CONFIG_PPC_PSERIES) && !phandle)
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phandle = __of_get_property(np, "ibm,phandle", &sz);
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np->phandle = (phandle && (sz >= 4)) ? be32_to_cpup(phandle) : 0;
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np->child = NULL;
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np->sibling = np->parent->child;
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np->parent->child = np;
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of_node_clear_flag(np, OF_DETACHED);
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}
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/**
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* of_attach_node() - Plug a device node into the tree and global list.
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*/
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int of_attach_node(struct device_node *np)
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{
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struct of_reconfig_data rd;
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unsigned long flags;
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memset(&rd, 0, sizeof(rd));
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rd.dn = np;
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mutex_lock(&of_mutex);
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raw_spin_lock_irqsave(&devtree_lock, flags);
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__of_attach_node(np);
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raw_spin_unlock_irqrestore(&devtree_lock, flags);
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__of_attach_node_sysfs(np);
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mutex_unlock(&of_mutex);
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of_reconfig_notify(OF_RECONFIG_ATTACH_NODE, &rd);
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return 0;
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}
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void __of_detach_node(struct device_node *np)
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{
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struct device_node *parent;
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if (WARN_ON(of_node_check_flag(np, OF_DETACHED)))
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return;
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parent = np->parent;
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if (WARN_ON(!parent))
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return;
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if (parent->child == np)
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parent->child = np->sibling;
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else {
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struct device_node *prevsib;
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for (prevsib = np->parent->child;
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prevsib->sibling != np;
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prevsib = prevsib->sibling)
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;
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prevsib->sibling = np->sibling;
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}
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of_node_set_flag(np, OF_DETACHED);
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}
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/**
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* of_detach_node() - "Unplug" a node from the device tree.
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*
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* The caller must hold a reference to the node. The memory associated with
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* the node is not freed until its refcount goes to zero.
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*/
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int of_detach_node(struct device_node *np)
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{
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struct of_reconfig_data rd;
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unsigned long flags;
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int rc = 0;
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memset(&rd, 0, sizeof(rd));
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rd.dn = np;
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mutex_lock(&of_mutex);
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raw_spin_lock_irqsave(&devtree_lock, flags);
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__of_detach_node(np);
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raw_spin_unlock_irqrestore(&devtree_lock, flags);
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__of_detach_node_sysfs(np);
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mutex_unlock(&of_mutex);
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of_reconfig_notify(OF_RECONFIG_DETACH_NODE, &rd);
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return rc;
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}
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EXPORT_SYMBOL_GPL(of_detach_node);
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/**
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* of_node_release() - release a dynamically allocated node
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* @kref: kref element of the node to be released
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*
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* In of_node_put() this function is passed to kref_put() as the destructor.
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*/
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void of_node_release(struct kobject *kobj)
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{
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struct device_node *node = kobj_to_device_node(kobj);
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struct property *prop = node->properties;
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/* We should never be releasing nodes that haven't been detached. */
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if (!of_node_check_flag(node, OF_DETACHED)) {
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pr_err("ERROR: Bad of_node_put() on %s\n", node->full_name);
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dump_stack();
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return;
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}
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if (!of_node_check_flag(node, OF_DYNAMIC))
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return;
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while (prop) {
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struct property *next = prop->next;
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kfree(prop->name);
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kfree(prop->value);
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kfree(prop);
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prop = next;
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if (!prop) {
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prop = node->deadprops;
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node->deadprops = NULL;
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}
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}
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kfree(node->full_name);
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kfree(node->data);
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kfree(node);
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}
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/**
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* __of_prop_dup - Copy a property dynamically.
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* @prop: Property to copy
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* @allocflags: Allocation flags (typically pass GFP_KERNEL)
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*
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* Copy a property by dynamically allocating the memory of both the
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* property structure and the property name & contents. The property's
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* flags have the OF_DYNAMIC bit set so that we can differentiate between
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* dynamically allocated properties and not.
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* Returns the newly allocated property or NULL on out of memory error.
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*/
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struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags)
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{
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struct property *new;
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new = kzalloc(sizeof(*new), allocflags);
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if (!new)
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return NULL;
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/*
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* NOTE: There is no check for zero length value.
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* In case of a boolean property, this will allocate a value
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* of zero bytes. We do this to work around the use
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* of of_get_property() calls on boolean values.
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*/
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new->name = kstrdup(prop->name, allocflags);
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new->value = kmemdup(prop->value, prop->length, allocflags);
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new->length = prop->length;
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if (!new->name || !new->value)
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goto err_free;
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/* mark the property as dynamic */
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of_property_set_flag(new, OF_DYNAMIC);
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return new;
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err_free:
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kfree(new->name);
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kfree(new->value);
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kfree(new);
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return NULL;
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}
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/**
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* __of_node_dup() - Duplicate or create an empty device node dynamically.
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* @fmt: Format string (plus vargs) for new full name of the device node
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*
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* Create an device tree node, either by duplicating an empty node or by allocating
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* an empty one suitable for further modification. The node data are
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* dynamically allocated and all the node flags have the OF_DYNAMIC &
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* OF_DETACHED bits set. Returns the newly allocated node or NULL on out of
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* memory error.
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*/
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struct device_node *__of_node_dup(const struct device_node *np, const char *fmt, ...)
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{
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va_list vargs;
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struct device_node *node;
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node = kzalloc(sizeof(*node), GFP_KERNEL);
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if (!node)
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return NULL;
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va_start(vargs, fmt);
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node->full_name = kvasprintf(GFP_KERNEL, fmt, vargs);
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va_end(vargs);
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if (!node->full_name) {
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kfree(node);
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return NULL;
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}
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of_node_set_flag(node, OF_DYNAMIC);
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of_node_set_flag(node, OF_DETACHED);
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of_node_init(node);
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/* Iterate over and duplicate all properties */
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if (np) {
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struct property *pp, *new_pp;
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for_each_property_of_node(np, pp) {
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new_pp = __of_prop_dup(pp, GFP_KERNEL);
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if (!new_pp)
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goto err_prop;
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if (__of_add_property(node, new_pp)) {
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kfree(new_pp->name);
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kfree(new_pp->value);
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kfree(new_pp);
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goto err_prop;
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}
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}
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}
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return node;
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|
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err_prop:
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of_node_put(node); /* Frees the node and properties */
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return NULL;
|
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}
|
|
|
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static void __of_changeset_entry_destroy(struct of_changeset_entry *ce)
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{
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of_node_put(ce->np);
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list_del(&ce->node);
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kfree(ce);
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}
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|
|
|
#ifdef DEBUG
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|
static void __of_changeset_entry_dump(struct of_changeset_entry *ce)
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{
|
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switch (ce->action) {
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case OF_RECONFIG_ADD_PROPERTY:
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|
case OF_RECONFIG_REMOVE_PROPERTY:
|
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case OF_RECONFIG_UPDATE_PROPERTY:
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pr_debug("cset<%p> %-15s %s/%s\n", ce, action_names[ce->action],
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ce->np->full_name, ce->prop->name);
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break;
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case OF_RECONFIG_ATTACH_NODE:
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case OF_RECONFIG_DETACH_NODE:
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pr_debug("cset<%p> %-15s %s\n", ce, action_names[ce->action],
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ce->np->full_name);
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break;
|
|
}
|
|
}
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|
#else
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|
static inline void __of_changeset_entry_dump(struct of_changeset_entry *ce)
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|
{
|
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/* empty */
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|
}
|
|
#endif
|
|
|
|
static void __of_changeset_entry_invert(struct of_changeset_entry *ce,
|
|
struct of_changeset_entry *rce)
|
|
{
|
|
memcpy(rce, ce, sizeof(*rce));
|
|
|
|
switch (ce->action) {
|
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case OF_RECONFIG_ATTACH_NODE:
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rce->action = OF_RECONFIG_DETACH_NODE;
|
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break;
|
|
case OF_RECONFIG_DETACH_NODE:
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rce->action = OF_RECONFIG_ATTACH_NODE;
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break;
|
|
case OF_RECONFIG_ADD_PROPERTY:
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rce->action = OF_RECONFIG_REMOVE_PROPERTY;
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break;
|
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case OF_RECONFIG_REMOVE_PROPERTY:
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rce->action = OF_RECONFIG_ADD_PROPERTY;
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break;
|
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case OF_RECONFIG_UPDATE_PROPERTY:
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rce->old_prop = ce->prop;
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rce->prop = ce->old_prop;
|
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/* update was used but original property did not exist */
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|
if (!rce->prop) {
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|
rce->action = OF_RECONFIG_REMOVE_PROPERTY;
|
|
rce->prop = ce->prop;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void __of_changeset_entry_notify(struct of_changeset_entry *ce, bool revert)
|
|
{
|
|
struct of_reconfig_data rd;
|
|
struct of_changeset_entry ce_inverted;
|
|
int ret;
|
|
|
|
if (revert) {
|
|
__of_changeset_entry_invert(ce, &ce_inverted);
|
|
ce = &ce_inverted;
|
|
}
|
|
|
|
switch (ce->action) {
|
|
case OF_RECONFIG_ATTACH_NODE:
|
|
case OF_RECONFIG_DETACH_NODE:
|
|
memset(&rd, 0, sizeof(rd));
|
|
rd.dn = ce->np;
|
|
ret = of_reconfig_notify(ce->action, &rd);
|
|
break;
|
|
case OF_RECONFIG_ADD_PROPERTY:
|
|
case OF_RECONFIG_REMOVE_PROPERTY:
|
|
case OF_RECONFIG_UPDATE_PROPERTY:
|
|
ret = of_property_notify(ce->action, ce->np, ce->prop, ce->old_prop);
|
|
break;
|
|
default:
|
|
pr_err("invalid devicetree changeset action: %i\n",
|
|
(int)ce->action);
|
|
return;
|
|
}
|
|
|
|
if (ret)
|
|
pr_err("changeset notifier error @%s\n", ce->np->full_name);
|
|
}
|
|
|
|
static int __of_changeset_entry_apply(struct of_changeset_entry *ce)
|
|
{
|
|
struct property *old_prop, **propp;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
__of_changeset_entry_dump(ce);
|
|
|
|
raw_spin_lock_irqsave(&devtree_lock, flags);
|
|
switch (ce->action) {
|
|
case OF_RECONFIG_ATTACH_NODE:
|
|
__of_attach_node(ce->np);
|
|
break;
|
|
case OF_RECONFIG_DETACH_NODE:
|
|
__of_detach_node(ce->np);
|
|
break;
|
|
case OF_RECONFIG_ADD_PROPERTY:
|
|
/* If the property is in deadprops then it must be removed */
|
|
for (propp = &ce->np->deadprops; *propp; propp = &(*propp)->next) {
|
|
if (*propp == ce->prop) {
|
|
*propp = ce->prop->next;
|
|
ce->prop->next = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
ret = __of_add_property(ce->np, ce->prop);
|
|
if (ret) {
|
|
pr_err("changeset: add_property failed @%s/%s\n",
|
|
ce->np->full_name,
|
|
ce->prop->name);
|
|
break;
|
|
}
|
|
break;
|
|
case OF_RECONFIG_REMOVE_PROPERTY:
|
|
ret = __of_remove_property(ce->np, ce->prop);
|
|
if (ret) {
|
|
pr_err("changeset: remove_property failed @%s/%s\n",
|
|
ce->np->full_name,
|
|
ce->prop->name);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case OF_RECONFIG_UPDATE_PROPERTY:
|
|
/* If the property is in deadprops then it must be removed */
|
|
for (propp = &ce->np->deadprops; *propp; propp = &(*propp)->next) {
|
|
if (*propp == ce->prop) {
|
|
*propp = ce->prop->next;
|
|
ce->prop->next = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
ret = __of_update_property(ce->np, ce->prop, &old_prop);
|
|
if (ret) {
|
|
pr_err("changeset: update_property failed @%s/%s\n",
|
|
ce->np->full_name,
|
|
ce->prop->name);
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
raw_spin_unlock_irqrestore(&devtree_lock, flags);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
switch (ce->action) {
|
|
case OF_RECONFIG_ATTACH_NODE:
|
|
__of_attach_node_sysfs(ce->np);
|
|
break;
|
|
case OF_RECONFIG_DETACH_NODE:
|
|
__of_detach_node_sysfs(ce->np);
|
|
break;
|
|
case OF_RECONFIG_ADD_PROPERTY:
|
|
/* ignore duplicate names */
|
|
__of_add_property_sysfs(ce->np, ce->prop);
|
|
break;
|
|
case OF_RECONFIG_REMOVE_PROPERTY:
|
|
__of_remove_property_sysfs(ce->np, ce->prop);
|
|
break;
|
|
case OF_RECONFIG_UPDATE_PROPERTY:
|
|
__of_update_property_sysfs(ce->np, ce->prop, ce->old_prop);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int __of_changeset_entry_revert(struct of_changeset_entry *ce)
|
|
{
|
|
struct of_changeset_entry ce_inverted;
|
|
|
|
__of_changeset_entry_invert(ce, &ce_inverted);
|
|
return __of_changeset_entry_apply(&ce_inverted);
|
|
}
|
|
|
|
/**
|
|
* of_changeset_init - Initialize a changeset for use
|
|
*
|
|
* @ocs: changeset pointer
|
|
*
|
|
* Initialize a changeset structure
|
|
*/
|
|
void of_changeset_init(struct of_changeset *ocs)
|
|
{
|
|
memset(ocs, 0, sizeof(*ocs));
|
|
INIT_LIST_HEAD(&ocs->entries);
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_changeset_init);
|
|
|
|
/**
|
|
* of_changeset_destroy - Destroy a changeset
|
|
*
|
|
* @ocs: changeset pointer
|
|
*
|
|
* Destroys a changeset. Note that if a changeset is applied,
|
|
* its changes to the tree cannot be reverted.
|
|
*/
|
|
void of_changeset_destroy(struct of_changeset *ocs)
|
|
{
|
|
struct of_changeset_entry *ce, *cen;
|
|
|
|
list_for_each_entry_safe_reverse(ce, cen, &ocs->entries, node)
|
|
__of_changeset_entry_destroy(ce);
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_changeset_destroy);
|
|
|
|
int __of_changeset_apply(struct of_changeset *ocs)
|
|
{
|
|
struct of_changeset_entry *ce;
|
|
int ret;
|
|
|
|
/* perform the rest of the work */
|
|
pr_debug("changeset: applying...\n");
|
|
list_for_each_entry(ce, &ocs->entries, node) {
|
|
ret = __of_changeset_entry_apply(ce);
|
|
if (ret) {
|
|
pr_err("Error applying changeset (%d)\n", ret);
|
|
list_for_each_entry_continue_reverse(ce, &ocs->entries, node)
|
|
__of_changeset_entry_revert(ce);
|
|
return ret;
|
|
}
|
|
}
|
|
pr_debug("changeset: applied, emitting notifiers.\n");
|
|
|
|
/* drop the global lock while emitting notifiers */
|
|
mutex_unlock(&of_mutex);
|
|
list_for_each_entry(ce, &ocs->entries, node)
|
|
__of_changeset_entry_notify(ce, 0);
|
|
mutex_lock(&of_mutex);
|
|
pr_debug("changeset: notifiers sent.\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* of_changeset_apply - Applies a changeset
|
|
*
|
|
* @ocs: changeset pointer
|
|
*
|
|
* Applies a changeset to the live tree.
|
|
* Any side-effects of live tree state changes are applied here on
|
|
* success, like creation/destruction of devices and side-effects
|
|
* like creation of sysfs properties and directories.
|
|
* Returns 0 on success, a negative error value in case of an error.
|
|
* On error the partially applied effects are reverted.
|
|
*/
|
|
int of_changeset_apply(struct of_changeset *ocs)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&of_mutex);
|
|
ret = __of_changeset_apply(ocs);
|
|
mutex_unlock(&of_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_changeset_apply);
|
|
|
|
int __of_changeset_revert(struct of_changeset *ocs)
|
|
{
|
|
struct of_changeset_entry *ce;
|
|
int ret;
|
|
|
|
pr_debug("changeset: reverting...\n");
|
|
list_for_each_entry_reverse(ce, &ocs->entries, node) {
|
|
ret = __of_changeset_entry_revert(ce);
|
|
if (ret) {
|
|
pr_err("Error reverting changeset (%d)\n", ret);
|
|
list_for_each_entry_continue(ce, &ocs->entries, node)
|
|
__of_changeset_entry_apply(ce);
|
|
return ret;
|
|
}
|
|
}
|
|
pr_debug("changeset: reverted, emitting notifiers.\n");
|
|
|
|
/* drop the global lock while emitting notifiers */
|
|
mutex_unlock(&of_mutex);
|
|
list_for_each_entry_reverse(ce, &ocs->entries, node)
|
|
__of_changeset_entry_notify(ce, 1);
|
|
mutex_lock(&of_mutex);
|
|
pr_debug("changeset: notifiers sent.\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* of_changeset_revert - Reverts an applied changeset
|
|
*
|
|
* @ocs: changeset pointer
|
|
*
|
|
* Reverts a changeset returning the state of the tree to what it
|
|
* was before the application.
|
|
* Any side-effects like creation/destruction of devices and
|
|
* removal of sysfs properties and directories are applied.
|
|
* Returns 0 on success, a negative error value in case of an error.
|
|
*/
|
|
int of_changeset_revert(struct of_changeset *ocs)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&of_mutex);
|
|
ret = __of_changeset_revert(ocs);
|
|
mutex_unlock(&of_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_changeset_revert);
|
|
|
|
/**
|
|
* of_changeset_action - Perform a changeset action
|
|
*
|
|
* @ocs: changeset pointer
|
|
* @action: action to perform
|
|
* @np: Pointer to device node
|
|
* @prop: Pointer to property
|
|
*
|
|
* On action being one of:
|
|
* + OF_RECONFIG_ATTACH_NODE
|
|
* + OF_RECONFIG_DETACH_NODE,
|
|
* + OF_RECONFIG_ADD_PROPERTY
|
|
* + OF_RECONFIG_REMOVE_PROPERTY,
|
|
* + OF_RECONFIG_UPDATE_PROPERTY
|
|
* Returns 0 on success, a negative error value in case of an error.
|
|
*/
|
|
int of_changeset_action(struct of_changeset *ocs, unsigned long action,
|
|
struct device_node *np, struct property *prop)
|
|
{
|
|
struct of_changeset_entry *ce;
|
|
|
|
ce = kzalloc(sizeof(*ce), GFP_KERNEL);
|
|
if (!ce)
|
|
return -ENOMEM;
|
|
|
|
/* get a reference to the node */
|
|
ce->action = action;
|
|
ce->np = of_node_get(np);
|
|
ce->prop = prop;
|
|
|
|
if (action == OF_RECONFIG_UPDATE_PROPERTY && prop)
|
|
ce->old_prop = of_find_property(np, prop->name, NULL);
|
|
|
|
/* add it to the list */
|
|
list_add_tail(&ce->node, &ocs->entries);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_changeset_action);
|