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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commit c8ffd1356d42223cbb8c86280a083cc3c93e6426, reversing changes made to 2ee6f3a5f7550de3599faef9704e166e5dcace35. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
128 lines
3.0 KiB
C
128 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2012
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* Joe Hershberger, National Instruments, joe.hershberger@ni.com
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*/
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#include <common.h>
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#include <env.h>
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#include <env_internal.h>
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#include <asm/global_data.h>
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/*
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* Look up a callback function pointer by name
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*/
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static struct env_clbk_tbl *find_env_callback(const char *name)
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{
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struct env_clbk_tbl *clbkp;
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int i;
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int num_callbacks = ll_entry_count(struct env_clbk_tbl, env_clbk);
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if (name == NULL)
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return NULL;
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/* look up the callback in the linker-list */
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for (i = 0, clbkp = ll_entry_start(struct env_clbk_tbl, env_clbk);
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i < num_callbacks;
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i++, clbkp++) {
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if (strcmp(name, clbkp->name) == 0)
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return clbkp;
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}
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return NULL;
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}
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static int first_call = 1;
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static const char *callback_list;
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/*
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* Look for a possible callback for a newly added variable
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* This is called specifically when the variable did not exist in the hash
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* previously, so the blanket update did not find this variable.
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*/
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void env_callback_init(struct env_entry *var_entry)
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{
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const char *var_name = var_entry->key;
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char callback_name[256] = "";
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struct env_clbk_tbl *clbkp;
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int ret = 1;
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if (first_call) {
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callback_list = env_get(ENV_CALLBACK_VAR);
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first_call = 0;
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}
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var_entry->callback = NULL;
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/* look in the ".callbacks" var for a reference to this variable */
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if (callback_list != NULL)
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ret = env_attr_lookup(callback_list, var_name, callback_name);
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/* only if not found there, look in the static list */
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if (ret)
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ret = env_attr_lookup(ENV_CALLBACK_LIST_STATIC, var_name,
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callback_name);
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/* if an association was found, set the callback pointer */
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if (!ret && strlen(callback_name)) {
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clbkp = find_env_callback(callback_name);
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if (clbkp != NULL)
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var_entry->callback = clbkp->callback;
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}
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}
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/*
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* Called on each existing env var prior to the blanket update since removing
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* a callback association should remove its callback.
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*/
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static int clear_callback(struct env_entry *entry)
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{
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entry->callback = NULL;
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return 0;
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}
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/*
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* Call for each element in the list that associates variables to callbacks
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*/
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static int set_callback(const char *name, const char *value, void *priv)
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{
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struct env_entry e, *ep;
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struct env_clbk_tbl *clbkp;
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e.key = name;
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e.data = NULL;
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e.callback = NULL;
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hsearch_r(e, ENV_FIND, &ep, &env_htab, 0);
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/* does the env variable actually exist? */
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if (ep != NULL) {
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/* the assocaition delares no callback, so remove the pointer */
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if (value == NULL || strlen(value) == 0)
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ep->callback = NULL;
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else {
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/* assign the requested callback */
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clbkp = find_env_callback(value);
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if (clbkp != NULL)
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ep->callback = clbkp->callback;
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}
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}
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return 0;
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}
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static int on_callbacks(const char *name, const char *value, enum env_op op,
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int flags)
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{
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/* remove all callbacks */
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hwalk_r(&env_htab, clear_callback);
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/* configure any static callback bindings */
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env_attr_walk(ENV_CALLBACK_LIST_STATIC, set_callback, NULL);
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/* configure any dynamic callback bindings */
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env_attr_walk(value, set_callback, NULL);
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return 0;
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}
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U_BOOT_ENV_CALLBACK(callbacks, on_callbacks);
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