From patchwork Sun Mar 14 11:13:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Lezcano X-Patchwork-Id: 12137273 X-Patchwork-Delegate: daniel.lezcano@linaro.org 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 E9B2AC433E0 for ; Sun, 14 Mar 2021 11:14:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BAFB964EBA for ; Sun, 14 Mar 2021 11:14:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235248AbhCNLOO (ORCPT ); Sun, 14 Mar 2021 07:14:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234904AbhCNLN5 (ORCPT ); Sun, 14 Mar 2021 07:13:57 -0400 Received: from mail-wr1-x433.google.com (mail-wr1-x433.google.com [IPv6:2a00:1450:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 92516C061762 for ; Sun, 14 Mar 2021 04:13:55 -0700 (PDT) Received: by mail-wr1-x433.google.com with SMTP id k8so4171251wrc.3 for ; Sun, 14 Mar 2021 04:13:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=8xPAvMxHmY9pOZ0ZnygmV1N99XR+BZf8XBmni53ESgY=; b=z6J3QWAUD5nKc3yZCQ4Wg8qGFur7mKvRy0vsI5FRjSEuyhyNqQIBJpbVYu5BNT44dG hYVy3cZLFtt0f/aCvRmDJYchM9tg3u4qmGNJzekJrznushNnni1o/7434/rXMTAw5tYw fGVKjU8u1OPfVb4G+oq98lIeH6fZ2FxBY/Ox4e+fDhNRC2DOFI0yXtsjQAfEaKaekLXx oLdQVlc1HKIts44VvP3L+zYHe55HYCRpKslJV0cVpFL7Z2ShTjgeR5BRV54A4qTJvQjM vDZaJxxohTSGC5WEvgv5I+yPj1WGByZsK1u/os2O2uuE/ZDXVZQSFAIzT+UXpY29URqC Hyrg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=8xPAvMxHmY9pOZ0ZnygmV1N99XR+BZf8XBmni53ESgY=; b=eTRji/koID4GJg0cP6H/Si7rh7wUmNPVCtzS9aHgRdU7YUaNqPYxM8aawbyYxSj/To xkPlZENprrjJGQ/EnibR4pIaNyQllUuV18syBGrKOqkri57u5rM/apfxHssNI3Uj0OEr cxhtAULGLxfeVbuclYZcEVA3N+O1RMG0ti8wo/Wl8OEhVOrJLJ5Dar76waiBv17vx8HI MeIrgU8Ng1ANysmvE7voJPz9PhvbGdahS4SlEk3EoH833wsMbNDPR3KOLoKG5pt6d2Kb X98tB2eM75TFqNlZRl2YBFYRo+iKA5EavyhAmaxS5LrSc8ldFBoht9tihX7QC6Fowfkk PDeg== X-Gm-Message-State: AOAM533OFX/ZrPyXPjXAH+IrvpLDjIK+cs2zvaZs/rOE/7UKxDFdi0R3 m2ojs+Kkog8LHuz+gGHttyq0FQ== X-Google-Smtp-Source: ABdhPJwf29Ewk1BVqDqe5JiILemCbN7mEXaTAvkXzrCUuuRmVGP5nkSSndWDQxXhgoQj0SHkx0lF1g== X-Received: by 2002:adf:e84f:: with SMTP id d15mr22660387wrn.394.1615720434029; Sun, 14 Mar 2021 04:13:54 -0700 (PDT) Received: from localhost.localdomain ([82.142.0.212]) by smtp.gmail.com with ESMTPSA id i8sm16828330wry.90.2021.03.14.04.13.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 14 Mar 2021 04:13:53 -0700 (PDT) From: Daniel Lezcano To: daniel.lezcano@linaro.org, rui.zhang@intel.com Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, lukasz.luba@arm.com, Jiri Pirko , Ido Schimmel , "David S. Miller" , Jakub Kicinski , Amit Kucheria , netdev@vger.kernel.org (open list:MELLANOX ETHERNET SWITCH DRIVERS) Subject: [PATCH v3 1/5] thermal/drivers/core: Use a char pointer for the cooling device name Date: Sun, 14 Mar 2021 12:13:29 +0100 Message-Id: <20210314111333.16551-1-daniel.lezcano@linaro.org> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org We want to have any kind of name for the cooling devices as we do no longer want to rely on auto-numbering. Let's replace the cooling device's fixed array by a char pointer to be allocated dynamically when registering the cooling device, so we don't limit the length of the name. Rework the error path at the same time as we have to rollback the allocations in case of error. Tested with a dummy device having the name: "Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch" A village on the island of Anglesey (Wales), known to have the longest name in Europe. Signed-off-by: Daniel Lezcano Reviewed-by: Lukasz Luba Tested-by: Ido Schimmel --- V3: - Inverted kfree() and put_device() when unregistering the cooling device (Reported by Ido Schimmel) --- .../ethernet/mellanox/mlxsw/core_thermal.c | 2 +- drivers/thermal/thermal_core.c | 38 +++++++++++-------- include/linux/thermal.h | 2 +- 3 files changed, 24 insertions(+), 18 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c index bf85ce9835d7..7447c2a73cbd 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c +++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c @@ -141,7 +141,7 @@ static int mlxsw_get_cooling_device_idx(struct mlxsw_thermal *thermal, /* Allow mlxsw thermal zone binding to an external cooling device */ for (i = 0; i < ARRAY_SIZE(mlxsw_thermal_external_allowed_cdev); i++) { if (strnstr(cdev->type, mlxsw_thermal_external_allowed_cdev[i], - sizeof(cdev->type))) + strlen(cdev->type))) return 0; } diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 996c038f83a4..c8d4010940ef 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -960,10 +960,7 @@ __thermal_cooling_device_register(struct device_node *np, { struct thermal_cooling_device *cdev; struct thermal_zone_device *pos = NULL; - int result; - - if (type && strlen(type) >= THERMAL_NAME_LENGTH) - return ERR_PTR(-EINVAL); + int ret; if (!ops || !ops->get_max_state || !ops->get_cur_state || !ops->set_cur_state) @@ -973,14 +970,17 @@ __thermal_cooling_device_register(struct device_node *np, if (!cdev) return ERR_PTR(-ENOMEM); - result = ida_simple_get(&thermal_cdev_ida, 0, 0, GFP_KERNEL); - if (result < 0) { - kfree(cdev); - return ERR_PTR(result); + ret = ida_simple_get(&thermal_cdev_ida, 0, 0, GFP_KERNEL); + if (ret < 0) + goto out_kfree_cdev; + cdev->id = ret; + + cdev->type = kstrdup(type ? type : "", GFP_KERNEL); + if (!cdev->type) { + ret = -ENOMEM; + goto out_ida_remove; } - cdev->id = result; - strlcpy(cdev->type, type ? : "", sizeof(cdev->type)); mutex_init(&cdev->lock); INIT_LIST_HEAD(&cdev->thermal_instances); cdev->np = np; @@ -990,12 +990,9 @@ __thermal_cooling_device_register(struct device_node *np, cdev->devdata = devdata; thermal_cooling_device_setup_sysfs(cdev); dev_set_name(&cdev->device, "cooling_device%d", cdev->id); - result = device_register(&cdev->device); - if (result) { - ida_simple_remove(&thermal_cdev_ida, cdev->id); - put_device(&cdev->device); - return ERR_PTR(result); - } + ret = device_register(&cdev->device); + if (ret) + goto out_kfree_type; /* Add 'this' new cdev to the global cdev list */ mutex_lock(&thermal_list_lock); @@ -1013,6 +1010,14 @@ __thermal_cooling_device_register(struct device_node *np, mutex_unlock(&thermal_list_lock); return cdev; + +out_kfree_type: + kfree(cdev->type); + put_device(&cdev->device); +out_ida_remove: + ida_simple_remove(&thermal_cdev_ida, cdev->id); +out_kfree_cdev: + return ERR_PTR(ret); } /** @@ -1171,6 +1176,7 @@ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev) ida_simple_remove(&thermal_cdev_ida, cdev->id); device_del(&cdev->device); thermal_cooling_device_destroy_sysfs(cdev); + kfree(cdev->type); put_device(&cdev->device); } EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister); diff --git a/include/linux/thermal.h b/include/linux/thermal.h index 6ac7bb1d2b1f..169502164364 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -91,7 +91,7 @@ struct thermal_cooling_device_ops { struct thermal_cooling_device { int id; - char type[THERMAL_NAME_LENGTH]; + char *type; struct device device; struct device_node *np; void *devdata;