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=-17.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=unavailable 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 CC5B9C2D0C1 for ; Thu, 5 Dec 2019 07:20:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A1C1924249 for ; Thu, 5 Dec 2019 07:20:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ld8GY3Ta" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728599AbfLEHUX (ORCPT ); Thu, 5 Dec 2019 02:20:23 -0500 Received: from mail-yw1-f73.google.com ([209.85.161.73]:39295 "EHLO mail-yw1-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726043AbfLEHUV (ORCPT ); Thu, 5 Dec 2019 02:20:21 -0500 Received: by mail-yw1-f73.google.com with SMTP id l12so1740260ywk.6 for ; Wed, 04 Dec 2019 23:20:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:cc; bh=ts1yBosTiHCFk+FM0gulija97H50ynj8MItVpiYvleQ=; b=ld8GY3TacvMwKqP04HpCI65PJfosSibr/XBnqjhUGqK8lCLovwEHCSicuYg0080tyP dfZbzuPfYYv3pcb1iC+/CjCG+fUQxrimPBy9fyQjgXTDZs1PPcwNfw3HCWbiFE7wRUKk UXIsBTWrF8A4dbgQooSvDgo/pV1rNrkqUuGILp+GFV2cUEVt5BpP6dJJCCd1gu0Gz93w 5mBfZHtVfBwJN9vRkQ1DcqJdelveL3SzXxVZcPfFgUTSzGwNBav4M86qMp+cHgOwnQrg 7tm3S/98VeIjDpYfSS1hAII/y8JDlNG2vNIvj/6oUTS8FiojrKMPKnf640QM1RQNpCR3 +hcQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:cc; bh=ts1yBosTiHCFk+FM0gulija97H50ynj8MItVpiYvleQ=; b=uZQFfCrYv568xhySxrKnEXIq9tDUeWGLbEEu09hjlPgGQSAJ9dvgj1ElX7KIGP8OWj oDRwQ1bg2mAlVjBLPTokk+VGEKXfGu9bkBTOmZzRQ6zdscLrKVki3XXVcq3TjcTue/Vo l/hE6b+zi8ff3bwpHxhbwRdEawQ85cLddUj3lxiL3Zh35GPAXLufnXjyjF5KZLbz8sNh d8Ur63lfrV5kShKVtQ59smLK4w57GnLZvYrH3SG/suNM5Hn+XZjOeZLJNRFgkMxa67xL +Qn3XildBsw+jyIVG9AXe2U09aQBMBxDxjJAGWS6/GwNEZv9w6JseYffqvKo+TsRC2eu NqCg== X-Gm-Message-State: APjAAAVyNV4+PkL033xSp4nB031VW8VDOPSZKb0uo2s7S9hLusPAG64g bC7v2FLG3JdpSGvuGDcTzJBiM44= X-Google-Smtp-Source: APXvYqwPLL22lSTzNWHq5MEuCpLUubSt5RY0lxSgL1kQNEi44mvvHms6QnuzTkyPX1MHD1unKh/9ObE= X-Received: by 2002:a0d:d911:: with SMTP id b17mr5123945ywe.269.1575530419968; Wed, 04 Dec 2019 23:20:19 -0800 (PST) Date: Wed, 4 Dec 2019 23:19:53 -0800 In-Reply-To: <20191205071953.121511-1-wvw@google.com> Message-Id: <20191205071953.121511-4-wvw@google.com> Mime-Version: 1.0 References: <20191205071953.121511-1-wvw@google.com> X-Mailer: git-send-email 2.24.0.393.g34dc348eaf-goog Subject: [PATCH v3 3/3] thermal: create softlink by name for thermal_zone and cooling_device From: Wei Wang Cc: wei.vince.wang@gmail.com, Wei Wang , Zhang Rui , Eduardo Valentin , Daniel Lezcano , Amit Kucheria , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Amit Kucheria Content-Type: text/plain; charset="UTF-8" To: unlisted-recipients:; (no To-header on input) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The paths thermal_zone%d and cooling_device%d are not intuitive and the numbers are subject to change due to device tree change. This usually leads to tree traversal in userspace code. The patch creates `tz-by-name' and `cdev-by-name' for thermal zone and cooling_device respectively. Signed-off-by: Wei Wang Reviewed-by: Amit Kucheria --- drivers/thermal/thermal_core.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 9db7f72e70f8..7872bd527f3f 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -22,6 +22,7 @@ #include #include #include +#include #define CREATE_TRACE_POINTS #include @@ -46,6 +47,8 @@ static DEFINE_MUTEX(poweroff_lock); static atomic_t in_suspend; static bool power_off_triggered; +static struct kobject *cdev_link_kobj; +static struct kobject *tz_link_kobj; static struct thermal_governor *def_governor; @@ -999,9 +1002,15 @@ __thermal_cooling_device_register(struct device_node *np, return ERR_PTR(result); } - /* Add 'this' new cdev to the global cdev list */ + /* Add 'this' new cdev to the global cdev list and create link*/ mutex_lock(&thermal_list_lock); list_add(&cdev->node, &thermal_cdev_list); + if (!cdev_link_kobj) + cdev_link_kobj = kobject_create_and_add("cdev-by-name", + cdev->device.kobj.parent); + if (!cdev_link_kobj || sysfs_create_link(cdev_link_kobj, + &cdev->device.kobj, cdev->type)) + dev_err(&cdev->device, "Failed to create cdev-by-name link\n"); mutex_unlock(&thermal_list_lock); /* Update binding information for 'this' new cdev */ @@ -1167,6 +1176,8 @@ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev) } } } + if (cdev_link_kobj) + sysfs_remove_link(cdev_link_kobj, cdev->type); mutex_unlock(&thermal_list_lock); @@ -1354,6 +1365,12 @@ thermal_zone_device_register(const char *type, int trips, int mask, mutex_lock(&thermal_list_lock); list_add_tail(&tz->node, &thermal_tz_list); + if (!tz_link_kobj) + tz_link_kobj = kobject_create_and_add("tz-by-name", + tz->device.kobj.parent); + if (!tz_link_kobj || sysfs_create_link(tz_link_kobj, + &tz->device.kobj, tz->type)) + dev_err(&tz->device, "Failed to create tz-by-name link\n"); mutex_unlock(&thermal_list_lock); /* Bind cooling devices for this zone */ @@ -1425,6 +1442,8 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) } } } + if (tz_link_kobj) + sysfs_remove_link(tz_link_kobj, tz->type); mutex_unlock(&thermal_list_lock); -- 2.24.0.393.g34dc348eaf-goog