From a74ea43df1afc68f265c0ac2cb64031d855ae97b Mon Sep 17 00:00:00 2001 From: Andres Salomon Date: Wed, 23 Feb 2011 22:38:22 -0800 Subject: of/promtree: allow DT device matching by fixing 'name' brokenness (v5) Commit e2f2a93b, "of/promtree: add package-to-path support to pdt" changed dp->name from using the 'name' property to using package-to-path. This fixed /proc/device-tree creation by eliminating conflicts between names (the 'name' property provides names like 'battery', whereas package-to-path provides names like '/foo/bar/battery@0', which we stripped to 'battery@0'). However, it also breaks of_device_id table matching. The fix that we _really_ wanted was to keep dp->name based upon the name property ('battery'), but based dp->full_name upon package-to-path ('battery@0'). This patch does just that. This changes all users (except SPARC) of promtree to use the full result from package-to-path for full_name, rather than stripping the directory out. In practice, the strings end up being exactly the same; this change saves time, code, and memory. SPARC continues to use the existing build_path_component() code. v2: combine two patches and revert of_pdt_node_name to original version v3: use dp->phandle instead of passing around node v4: warn/bail out for non-sparc archs if pkg2path is not set v5: split of_pdt_build_full_name into sparc & non-sparc versions v6: Pass NULL to pkg2path before buf gets assigned. Drop check for pkg2path hook on each and every node. v7: Don't BUG() when unable to get the full_path; create a known-unique name instead. Signed-off-by: Andres Salomon Signed-off-by: Grant Likely --- drivers/of/pdt.c | 112 +++++++++++++++++++++---------------------------------- 1 file changed, 42 insertions(+), 70 deletions(-) (limited to 'drivers/of') diff --git a/drivers/of/pdt.c b/drivers/of/pdt.c index 28295d0a50f6..4d87b5dc9284 100644 --- a/drivers/of/pdt.c +++ b/drivers/of/pdt.c @@ -36,19 +36,55 @@ unsigned int of_pdt_unique_id __initdata; (p)->unique_id = of_pdt_unique_id++; \ } while (0) -static inline const char *of_pdt_node_name(struct device_node *dp) +static char * __init of_pdt_build_full_name(struct device_node *dp) { - return dp->path_component_name; + int len, ourlen, plen; + char *n; + + dp->path_component_name = build_path_component(dp); + + plen = strlen(dp->parent->full_name); + ourlen = strlen(dp->path_component_name); + len = ourlen + plen + 2; + + n = prom_early_alloc(len); + strcpy(n, dp->parent->full_name); + if (!of_node_is_root(dp->parent)) { + strcpy(n + plen, "/"); + plen++; + } + strcpy(n + plen, dp->path_component_name); + + return n; } -#else +#else /* CONFIG_SPARC */ static inline void of_pdt_incr_unique_id(void *p) { } static inline void irq_trans_init(struct device_node *dp) { } -static inline const char *of_pdt_node_name(struct device_node *dp) +static char * __init of_pdt_build_full_name(struct device_node *dp) { - return dp->name; + static int failsafe_id = 0; /* for generating unique names on failure */ + char *buf; + int len; + + if (of_pdt_prom_ops->pkg2path(dp->phandle, NULL, 0, &len)) + goto failsafe; + + buf = prom_early_alloc(len + 1); + if (of_pdt_prom_ops->pkg2path(dp->phandle, buf, len, &len)) + goto failsafe; + return buf; + + failsafe: + buf = prom_early_alloc(strlen(dp->parent->full_name) + + strlen(dp->name) + 16); + sprintf(buf, "%s/%s@unknown%i", + of_node_is_root(dp->parent) ? "" : dp->parent->full_name, + dp->name, failsafe_id++); + pr_err("%s: pkg2path failed; assigning %s\n", __func__, buf); + return buf; } #endif /* !CONFIG_SPARC */ @@ -132,47 +168,6 @@ static char * __init of_pdt_get_one_property(phandle node, const char *name) return buf; } -static char * __init of_pdt_try_pkg2path(phandle node) -{ - char *res, *buf = NULL; - int len; - - if (!of_pdt_prom_ops->pkg2path) - return NULL; - - if (of_pdt_prom_ops->pkg2path(node, buf, 0, &len)) - return NULL; - buf = prom_early_alloc(len + 1); - if (of_pdt_prom_ops->pkg2path(node, buf, len, &len)) { - pr_err("%s: package-to-path failed\n", __func__); - return NULL; - } - - res = strrchr(buf, '/'); - if (!res) { - pr_err("%s: couldn't find / in %s\n", __func__, buf); - return NULL; - } - return res+1; -} - -/* - * When fetching the node's name, first try using package-to-path; if - * that fails (either because the arch hasn't supplied a PROM callback, - * or some other random failure), fall back to just looking at the node's - * 'name' property. - */ -static char * __init of_pdt_build_name(phandle node) -{ - char *buf; - - buf = of_pdt_try_pkg2path(node); - if (!buf) - buf = of_pdt_get_one_property(node, "name"); - - return buf; -} - static struct device_node * __init of_pdt_create_node(phandle node, struct device_node *parent) { @@ -187,7 +182,7 @@ static struct device_node * __init of_pdt_create_node(phandle node, kref_init(&dp->kref); - dp->name = of_pdt_build_name(node); + dp->name = of_pdt_get_one_property(node, "name"); dp->type = of_pdt_get_one_property(node, "device_type"); dp->phandle = node; @@ -198,26 +193,6 @@ static struct device_node * __init of_pdt_create_node(phandle node, return dp; } -static char * __init of_pdt_build_full_name(struct device_node *dp) -{ - int len, ourlen, plen; - char *n; - - plen = strlen(dp->parent->full_name); - ourlen = strlen(of_pdt_node_name(dp)); - len = ourlen + plen + 2; - - n = prom_early_alloc(len); - strcpy(n, dp->parent->full_name); - if (!of_node_is_root(dp->parent)) { - strcpy(n + plen, "/"); - plen++; - } - strcpy(n + plen, of_pdt_node_name(dp)); - - return n; -} - static struct device_node * __init of_pdt_build_tree(struct device_node *parent, phandle node, struct device_node ***nextp) @@ -240,9 +215,6 @@ static struct device_node * __init of_pdt_build_tree(struct device_node *parent, *(*nextp) = dp; *nextp = &dp->allnext; -#if defined(CONFIG_SPARC) - dp->path_component_name = build_path_component(dp); -#endif dp->full_name = of_pdt_build_full_name(dp); dp->child = of_pdt_build_tree(dp, -- cgit v1.2.3