From patchwork Sun Jul 25 13:28:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Salah Triki X-Patchwork-Id: 12398129 X-Patchwork-Delegate: jikos@jikos.cz 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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 96767C4338F for ; Sun, 25 Jul 2021 13:29:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6D95060F11 for ; Sun, 25 Jul 2021 13:29:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230192AbhGYMse (ORCPT ); Sun, 25 Jul 2021 08:48:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33846 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230075AbhGYMsd (ORCPT ); Sun, 25 Jul 2021 08:48:33 -0400 Received: from mail-wm1-x330.google.com (mail-wm1-x330.google.com [IPv6:2a00:1450:4864:20::330]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E8C73C061760; Sun, 25 Jul 2021 06:29:03 -0700 (PDT) Received: by mail-wm1-x330.google.com with SMTP id 9-20020a05600c26c9b02901e44e9caa2aso4521187wmv.4; Sun, 25 Jul 2021 06:29:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:mime-version:content-disposition; bh=v7cnCuDq5ZGSk7DH1MRlBzKJ5po3ZMRHzGSaZzKFHNw=; b=ST9BdOPGw0sa/vFoWmxuFKmfHm+IKXQU/QOk1XJFzl8g4G9sDehR8fTpt8MF4Yxn54 9kKQxj4vjrowaFcx+3n54suI3yz6SCJUIubmDn7lq8UlXWwHF95BdiWhnh1IadNxc1jT 5HJYD6xcaMBvM2MZgNm8PG4rOTDeebEGophTxAseKlq6GoeJUYh30/IHeq8p7ZY0GGa1 AB6R+8DFb4bth6/SpqU5Ujj2ofacqmSypbgS12aQJVRMnrpNkl6ICWjfNJOYrxx5Mc05 2mX/h2FTSX4mXGtAJKUhzdlvVEB4D177kwxUYpQDRqXzqOOq8PyN25vU+XLIOAM9oHNL s86w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition; bh=v7cnCuDq5ZGSk7DH1MRlBzKJ5po3ZMRHzGSaZzKFHNw=; b=I+GUNKHxH507UslChulcjf1hJDlocSKC8Il26JyDXlrma7V2ndNYSw17Cfp27wb2Ec j9pF6iLimWn8LCIvEMimmUwU6ysf2IeFcMKDaFhYhwQrRGuCT923VhE7AryWArxnRiN+ mSoXRFY+kGvwUScSlQ4FJY0SwD4tzZoJp7l8FnD2DjdwVtJ9MGKTHpX3HqPmr5Jbq1L+ 2k6Ps25cPgBcx37T5KL4dCRVt0D6Ngm25p2DJ1SpExozh9VrMIxr87VjybO/DGI7DwYR uNb4YI49AFNEbS2atoV7icJBZFXp/Yyu8Vz0KmmT9bszo6GtPN+Tyugzq0G4zWSJqQW+ hYaw== X-Gm-Message-State: AOAM533DFxhNslUeH7dgBIe+ksOcq4P378UD15cFunJTL6kyhzKAKMxe ztmJK5TIW8Ja2uaCIPPnOso= X-Google-Smtp-Source: ABdhPJzA+IGhEWdT+aE8IqiZIGsJX3lbPJmCeIo1NpXRUJmQvN7dqZr+rBmvc3mOuTwwFJrKdeJEeg== X-Received: by 2002:a05:600c:2942:: with SMTP id n2mr2230863wmd.152.1627219742578; Sun, 25 Jul 2021 06:29:02 -0700 (PDT) Received: from pc ([196.235.233.206]) by smtp.gmail.com with ESMTPSA id q17sm4010433wre.3.2021.07.25.06.29.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Jul 2021 06:29:01 -0700 (PDT) Date: Sun, 25 Jul 2021 14:28:58 +0100 From: Salah Triki To: Jiri Kosina , Benjamin Tissoires , gregkh@linuxfoundation.org Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] hid-elo: update the reference count of the usb device structure Message-ID: <20210725132858.GA614754@pc> MIME-Version: 1.0 Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Use usb_get_dev() to increment the reference count of the usb device structure in order to avoid releasing the structure while it is still in use. And use usb_put_dev() to decrement the reference count and thus, when it will be equal to 0 the structure will be released. Signed-off-by: Salah Triki --- Change since v1: Modification of the description drivers/hid/hid-elo.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/hid/hid-elo.c b/drivers/hid/hid-elo.c index 0d22713a3874..383dfda8c12f 100644 --- a/drivers/hid/hid-elo.c +++ b/drivers/hid/hid-elo.c @@ -228,13 +228,15 @@ static int elo_probe(struct hid_device *hdev, const struct hid_device_id *id) { struct elo_priv *priv; int ret; + struct usb_device *udev; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; INIT_DELAYED_WORK(&priv->work, elo_work); - priv->usbdev = interface_to_usbdev(to_usb_interface(hdev->dev.parent)); + udev = interface_to_usbdev(to_usb_interface(hdev->dev.parent)); + priv->usbdev = usb_get_dev(udev); hid_set_drvdata(hdev, priv); @@ -265,6 +267,8 @@ static void elo_remove(struct hid_device *hdev) { struct elo_priv *priv = hid_get_drvdata(hdev); + usb_put_dev(priv->usbdev); + hid_hw_stop(hdev); cancel_delayed_work_sync(&priv->work); kfree(priv);