Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755860Ab1BXTpx (ORCPT ); Thu, 24 Feb 2011 14:45:53 -0500 Received: from LUNGE.MIT.EDU ([18.54.1.69]:56663 "EHLO lunge.queued.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753899Ab1BXTpw (ORCPT ); Thu, 24 Feb 2011 14:45:52 -0500 Date: Thu, 24 Feb 2011 11:45:48 -0800 From: Andres Salomon To: Grant Likely Cc: dsd@laptop.org, sparclinux@vger.kernel.org, devicetree-discuss@lists.ozlabs.org, linux-kernel@vger.kernel.org, davem@davemloft.net Subject: [PATCH v6] of/pdt: allow DT device matching by fixing 'name' brokenness Message-ID: <20110224114548.6955127e@queued.net> In-Reply-To: <20110224165917.3760.24493.stgit@localhost6.localdomain6> References: <20110224165917.3760.24493.stgit@localhost6.localdomain6> X-Mailer: Claws Mail 3.7.6 (GTK+ 2.20.1; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6032 Lines: 208 Commit e2f2a93b 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 also changes OLPC behavior 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. 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 v6: rework functions based on Grant's suggestions; WARN_ON if no pkg2path hook Signed-off-by: Andres Salomon --- drivers/of/pdt.c | 125 ++++++++++++++++++++++++------------------------------ 1 files changed, 55 insertions(+), 70 deletions(-) diff --git a/drivers/of/pdt.c b/drivers/of/pdt.c index 28295d0..2c6be9c 100644 --- a/drivers/of/pdt.c +++ b/drivers/of/pdt.c @@ -36,19 +36,68 @@ 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) +/* + * When fetching the full name we want the name we see with + * package-to-path (ie, '/foo/bar/battery@0') rather than what + * we see with the name property (ie, 'battery'). + */ +static char * __init of_pdt_build_full_name(struct device_node *dp) { - return dp->name; + char *buf = NULL; + int len; + + if (!of_pdt_prom_ops->pkg2path) { + /* pkg2path hook should be set for all non-sparc archs */ + WARN_ON_ONCE(1); + goto fail; + } + + if (of_pdt_prom_ops->pkg2path(dp->phandle, buf, 0, &len)) { + pr_err("PDT: package-to-path failed on %s\n", dp->name); + goto fail; + } + + buf = prom_early_alloc(len + 1); + if (!buf) + /* we have larger problems than DT creation.. */ + return NULL; + + if (of_pdt_prom_ops->pkg2path(dp->phandle, buf, len, &len)) { + pr_err("PDT: package-to-path failed on %s\n", dp->name); + goto fail; + } + return buf; + +fail: + /* hobble along w/ dp->name if pkg2path fails; not ideal */ + return (char *) dp->name; } #endif /* !CONFIG_SPARC */ @@ -132,47 +181,6 @@ 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 +195,7 @@ 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 +206,6 @@ 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 +228,6 @@ 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, -- 1.7.2.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/