diff options
Diffstat (limited to 'drivers/of/resolver.c')
-rw-r--r-- | drivers/of/resolver.c | 172 |
1 files changed, 85 insertions, 87 deletions
diff --git a/drivers/of/resolver.c b/drivers/of/resolver.c index 0ce38aa0ed3c..0778747cdd58 100644 --- a/drivers/of/resolver.c +++ b/drivers/of/resolver.c @@ -74,17 +74,17 @@ static phandle live_tree_max_phandle(void) /* * Adjust a subtree's phandle values by a given delta. */ -static void adjust_overlay_phandles(struct device_node *node, +static void adjust_overlay_phandles(struct device_node *overlay, int phandle_delta) { struct device_node *child; struct property *prop; phandle phandle; - if (node->phandle != 0 && node->phandle != OF_PHANDLE_ILLEGAL) - node->phandle += phandle_delta; + if (overlay->phandle != 0 && overlay->phandle != OF_PHANDLE_ILLEGAL) + overlay->phandle += phandle_delta; - for_each_property_of_node(node, prop) { + for_each_property_of_node(overlay, prop) { if (of_prop_cmp(prop->name, "phandle") && of_prop_cmp(prop->name, "linux,phandle")) @@ -97,41 +97,40 @@ static void adjust_overlay_phandles(struct device_node *node, if (phandle == OF_PHANDLE_ILLEGAL) continue; - *(uint32_t *)prop->value = cpu_to_be32(node->phandle); + *(uint32_t *)prop->value = cpu_to_be32(overlay->phandle); } - for_each_child_of_node(node, child) + for_each_child_of_node(overlay, child) adjust_overlay_phandles(child, phandle_delta); } -static int update_usages_of_a_phandle_reference(struct device_node *node, - struct property *rprop, int value) +static int update_usages_of_a_phandle_reference(struct device_node *overlay, + struct property *prop_fixup, phandle phandle) { - phandle phandle; struct device_node *refnode; - struct property *sprop; - char *propval, *propcur, *propend, *nodestr, *propstr, *s; - int offset, propcurlen; + struct property *prop; + char *value, *cur, *end, *node_path, *prop_name, *s; + int offset, len; int err = 0; - propval = kmalloc(rprop->length, GFP_KERNEL); - if (!propval) + value = kmalloc(prop_fixup->length, GFP_KERNEL); + if (!value) return -ENOMEM; - memcpy(propval, rprop->value, rprop->length); + memcpy(value, prop_fixup->value, prop_fixup->length); - propend = propval + rprop->length; - for (propcur = propval; propcur < propend; propcur += propcurlen + 1) { - propcurlen = strlen(propcur); + end = value + prop_fixup->length; + for (cur = value; cur < end; cur += len + 1) { + len = strlen(cur); - nodestr = propcur; - s = strchr(propcur, ':'); + node_path = cur; + s = strchr(cur, ':'); if (!s) { err = -EINVAL; goto err_fail; } *s++ = '\0'; - propstr = s; + prop_name = s; s = strchr(s, ':'); if (!s) { err = -EINVAL; @@ -143,27 +142,26 @@ static int update_usages_of_a_phandle_reference(struct device_node *node, if (err) goto err_fail; - refnode = find_node_by_full_name(node, nodestr); + refnode = find_node_by_full_name(overlay, node_path); if (!refnode) continue; - for_each_property_of_node(refnode, sprop) { - if (!of_prop_cmp(sprop->name, propstr)) + for_each_property_of_node(refnode, prop) { + if (!of_prop_cmp(prop->name, prop_name)) break; } of_node_put(refnode); - if (!sprop) { + if (!prop) { err = -ENOENT; goto err_fail; } - phandle = value; - *(__be32 *)(sprop->value + offset) = cpu_to_be32(phandle); + *(__be32 *)(prop->value + offset) = cpu_to_be32(phandle); } err_fail: - kfree(propval); + kfree(value); return err; } @@ -184,61 +182,61 @@ static int node_name_cmp(const struct device_node *dn1, * Does not take any devtree locks so make sure you call this on a tree * which is at the detached state. */ -static int adjust_local_phandle_references(struct device_node *node, - struct device_node *target, int phandle_delta) +static int adjust_local_phandle_references(struct device_node *local_fixups, + struct device_node *overlay, int phandle_delta) { - struct device_node *child, *childtarget; - struct property *rprop, *sprop; + struct device_node *child, *overlay_child; + struct property *prop_fix, *prop; int err, i, count; unsigned int off; phandle phandle; - if (!node) + if (!local_fixups) return 0; - for_each_property_of_node(node, rprop) { + for_each_property_of_node(local_fixups, prop_fix) { /* skip properties added automatically */ - if (!of_prop_cmp(rprop->name, "name") || - !of_prop_cmp(rprop->name, "phandle") || - !of_prop_cmp(rprop->name, "linux,phandle")) + if (!of_prop_cmp(prop_fix->name, "name") || + !of_prop_cmp(prop_fix->name, "phandle") || + !of_prop_cmp(prop_fix->name, "linux,phandle")) continue; - if ((rprop->length % 4) != 0 || rprop->length == 0) + if ((prop_fix->length % 4) != 0 || prop_fix->length == 0) return -EINVAL; - count = rprop->length / sizeof(__be32); + count = prop_fix->length / sizeof(__be32); - for_each_property_of_node(target, sprop) { - if (!of_prop_cmp(sprop->name, rprop->name)) + for_each_property_of_node(overlay, prop) { + if (!of_prop_cmp(prop->name, prop_fix->name)) break; } - if (!sprop) + if (!prop) return -EINVAL; for (i = 0; i < count; i++) { - off = be32_to_cpu(((__be32 *)rprop->value)[i]); - if (off >= sprop->length || (off + 4) > sprop->length) + off = be32_to_cpu(((__be32 *)prop_fix->value)[i]); + if (off >= prop->length || (off + 4) > prop->length) return -EINVAL; if (phandle_delta) { - phandle = be32_to_cpu(*(__be32 *)(sprop->value + off)); + phandle = be32_to_cpu(*(__be32 *)(prop->value + off)); phandle += phandle_delta; - *(__be32 *)(sprop->value + off) = cpu_to_be32(phandle); + *(__be32 *)(prop->value + off) = cpu_to_be32(phandle); } } } - for_each_child_of_node(node, child) { + for_each_child_of_node(local_fixups, child) { - for_each_child_of_node(target, childtarget) - if (!node_name_cmp(child, childtarget)) + for_each_child_of_node(overlay, overlay_child) + if (!node_name_cmp(child, overlay_child)) break; - if (!childtarget) + if (!overlay_child) return -EINVAL; - err = adjust_local_phandle_references(child, childtarget, + err = adjust_local_phandle_references(child, overlay_child, phandle_delta); if (err) return err; @@ -260,78 +258,78 @@ static int adjust_local_phandle_references(struct device_node *node, * are fit to be inserted or operate upon the live tree. * Returns 0 on success or a negative error value on error. */ -int of_resolve_phandles(struct device_node *resolve) +int of_resolve_phandles(struct device_node *overlay) { - struct device_node *child, *childroot, *refnode; - struct device_node *root_sym, *resolve_sym, *resolve_fix; - struct property *rprop; + struct device_node *child, *local_fixups, *refnode; + struct device_node *tree_symbols, *overlay_symbols, *overlay_fixups; + struct property *prop; const char *refpath; phandle phandle, phandle_delta; int err; - if (!resolve) - pr_err("%s: null node\n", __func__); - if (resolve && !of_node_check_flag(resolve, OF_DETACHED)) + if (!overlay) + pr_err("%s: null overlay\n", __func__); + if (overlay && !of_node_check_flag(overlay, OF_DETACHED)) pr_err("%s: node %s not detached\n", __func__, - resolve->full_name); - if (!resolve || !of_node_check_flag(resolve, OF_DETACHED)) + overlay->full_name); + if (!overlay || !of_node_check_flag(overlay, OF_DETACHED)) return -EINVAL; phandle_delta = live_tree_max_phandle() + 1; - adjust_overlay_phandles(resolve, phandle_delta); + adjust_overlay_phandles(overlay, phandle_delta); - childroot = NULL; - for_each_child_of_node(resolve, childroot) - if (!of_node_cmp(childroot->name, "__local_fixups__")) + local_fixups = NULL; + for_each_child_of_node(overlay, local_fixups) + if (!of_node_cmp(local_fixups->name, "__local_fixups__")) break; - if (childroot != NULL) { - err = adjust_local_phandle_references(childroot, - resolve, 0); + if (local_fixups != NULL) { + err = adjust_local_phandle_references(local_fixups, + overlay, 0); if (err) return err; - BUG_ON(adjust_local_phandle_references(childroot, - resolve, phandle_delta)); + BUG_ON(adjust_local_phandle_references(local_fixups, + overlay, phandle_delta)); } - root_sym = NULL; - resolve_sym = NULL; - resolve_fix = NULL; + tree_symbols = NULL; + overlay_symbols = NULL; + overlay_fixups = NULL; - root_sym = of_find_node_by_path("/__symbols__"); + tree_symbols = of_find_node_by_path("/__symbols__"); - for_each_child_of_node(resolve, child) { + for_each_child_of_node(overlay, child) { - if (!resolve_sym && !of_node_cmp(child->name, "__symbols__")) - resolve_sym = child; + if (!overlay_symbols && !of_node_cmp(child->name, "__symbols__")) + overlay_symbols = child; - if (!resolve_fix && !of_node_cmp(child->name, "__fixups__")) - resolve_fix = child; + if (!overlay_fixups && !of_node_cmp(child->name, "__fixups__")) + overlay_fixups = child; - if (resolve_sym && resolve_fix) + if (overlay_symbols && overlay_fixups) break; } - if (!resolve_fix) { + if (!overlay_fixups) { err = 0; goto out; } - if (!root_sym) { + if (!tree_symbols) { pr_err("%s: no symbols in root of device tree.\n", __func__); err = -EINVAL; goto out; } - for_each_property_of_node(resolve_fix, rprop) { + for_each_property_of_node(overlay_fixups, prop) { /* skip properties added automatically */ - if (!of_prop_cmp(rprop->name, "name")) + if (!of_prop_cmp(prop->name, "name")) continue; - err = of_property_read_string(root_sym, - rprop->name, &refpath); + err = of_property_read_string(tree_symbols, + prop->name, &refpath); if (err) goto out; @@ -344,13 +342,13 @@ int of_resolve_phandles(struct device_node *resolve) phandle = refnode->phandle; of_node_put(refnode); - err = update_usages_of_a_phandle_reference(resolve, rprop, phandle); + err = update_usages_of_a_phandle_reference(overlay, prop, phandle); if (err) break; } out: - of_node_put(root_sym); + of_node_put(tree_symbols); return err; } |