From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.6 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9A7B4C4321E for ; Fri, 7 Sep 2018 17:40:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3F2182075E for ; Fri, 7 Sep 2018 17:40:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=obeliks.de header.i=@obeliks.de header.b="DEIw7t0E" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3F2182075E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nospam.obeliks.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727670AbeIGWWm (ORCPT ); Fri, 7 Sep 2018 18:22:42 -0400 Received: from scopuli.esotechnik.de ([79.143.188.15]:60319 "EHLO mail.esotechnik.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726662AbeIGWWm (ORCPT ); Fri, 7 Sep 2018 18:22:42 -0400 Received: by mail.esotechnik.net (Postfix) with ESMTPSA id DDF23AE0B81; Fri, 7 Sep 2018 19:35:16 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=obeliks.de; s=jul2017; t=1536341716; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=rbTc0Cze7uMG1Zf0ndLu9i1seMNFMJK4hMAr6DqnFmw=; b=DEIw7t0EiKmVlk6K64LKBz0IhpSBesFGTxlqs4/lXmPU9fFiQXkyS2LIfh6KZKgyc4XU0r XDlbFRf9dzpwCStGHdOMFWVxFeMHrn5s6Tv0R6AxZz526KQaNYcrZxPt/KoL58+bT/gaz3 1NNUhMsLBcC0GEqj+2SssgyDdjkLxaco1pa+4VJaXM5iNmfo8YdiwwRSLRikPUll2ODHQt H9SZjjDN2z/ecrWF36ZNVMFJiczw8JP++eNXagIoglQ6R9o1UF2+edzbVDCTF/cc30zvBw a41IdVEC51O0kTK8Pc20F0ZW0yWo2ExP15+XeQpno0k70QpQKWySnha/4U5/ig== From: Bernhard Frauendienst To: David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Richard Weinberger Cc: Miquel Raynal , linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/3] mtd: core: add get_mtd_device_by_node Date: Fri, 7 Sep 2018 19:35:13 +0200 Message-Id: <20180907173515.19990-2-kernel@nospam.obeliks.de> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180907173515.19990-1-kernel@nospam.obeliks.de> References: <20180907173515.19990-1-kernel@nospam.obeliks.de> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add function to retrieve a mtd device by its OF node. Since drivers can assign arbitrary names to mtd devices in the absence of a label property, there is no other reliable way to retrieve a mtd device for a given OF node. Signed-off-by: Bernhard Frauendienst Reviewed-by: Miquel Raynal --- drivers/mtd/mtdcore.c | 38 ++++++++++++++++++++++++++++++++++++++ include/linux/mtd/mtd.h | 2 ++ 2 files changed, 40 insertions(+) diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 97ac219c082e..87dd63926bc9 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -926,6 +926,44 @@ struct mtd_info *get_mtd_device_nm(const char *name) } EXPORT_SYMBOL_GPL(get_mtd_device_nm); +/** + * get_mtd_device_by_node - obtain a validated handle for an MTD device + * by of_node + * @of_node: OF node of MTD device to open + * + * This function returns MTD device description structure in case of + * success and an error code in case of failure. + */ +struct mtd_info *get_mtd_device_by_node(const struct device_node *of_node) +{ + int err = -ENODEV; + struct mtd_info *mtd = NULL, *other; + + mutex_lock(&mtd_table_mutex); + + mtd_for_each_device(other) { + if (of_node == other->dev.of_node) { + mtd = other; + break; + } + } + + if (!mtd) + goto out_unlock; + + err = __get_mtd_device(mtd); + if (err) + goto out_unlock; + + mutex_unlock(&mtd_table_mutex); + return mtd; + +out_unlock: + mutex_unlock(&mtd_table_mutex); + return ERR_PTR(err); +} +EXPORT_SYMBOL_GPL(get_mtd_device_by_node); + void put_mtd_device(struct mtd_info *mtd) { mutex_lock(&mtd_table_mutex); diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index cd0be91bdefa..fe71358f8eaa 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -570,6 +570,8 @@ extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num); extern int __get_mtd_device(struct mtd_info *mtd); extern void __put_mtd_device(struct mtd_info *mtd); extern struct mtd_info *get_mtd_device_nm(const char *name); +extern struct mtd_info *get_mtd_device_by_node( + const struct device_node *of_node); extern void put_mtd_device(struct mtd_info *mtd); -- 2.17.1