From patchwork Tue Jul 5 14:39:20 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 9214385 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 29C7E6088F for ; Tue, 5 Jul 2016 14:40:32 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 176D425749 for ; Tue, 5 Jul 2016 14:40:32 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 043EF24B5B; Tue, 5 Jul 2016 14:40:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C614624B5B for ; Tue, 5 Jul 2016 14:40:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933219AbcGEOkR (ORCPT ); Tue, 5 Jul 2016 10:40:17 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37243 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933134AbcGEOkQ (ORCPT ); Tue, 5 Jul 2016 10:40:16 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 393C285541; Tue, 5 Jul 2016 14:40:16 +0000 (UTC) Received: from plouf.banquise.eu.com (ovpn-116-124.ams2.redhat.com [10.36.116.124]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u65EdPaP001766; Tue, 5 Jul 2016 10:40:14 -0400 From: Benjamin Tissoires To: Jiri Kosina , Ping Cheng , Jason Gerecke , Aaron Skomra , Peter Hutterer Cc: linux-kernel@vger.kernel.org, linux-input@vger.kernel.org Subject: [PATCH 24/27] HID: wacom: leds: actually release the LEDs on disconnect Date: Tue, 5 Jul 2016 16:39:20 +0200 Message-Id: <1467729563-23318-25-git-send-email-benjamin.tissoires@redhat.com> In-Reply-To: <1467729563-23318-1-git-send-email-benjamin.tissoires@redhat.com> References: <1467729563-23318-1-git-send-email-benjamin.tissoires@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Tue, 05 Jul 2016 14:40:16 +0000 (UTC) Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP There is a bug (?) in devm_led_classdev_register() in which its increments the refcount of the parent. If the parent is an input device, that means the ref count never reaches 0 when devm_input_device_release() gets called. This means that the LEDs and all the devres resources attached to the input device are not released. Manually force the release of the group so that the leds are released once we are done using them. Signed-off-by: Benjamin Tissoires --- drivers/hid/wacom.h | 1 + drivers/hid/wacom_sys.c | 27 ++++++++++++++++++++++++++- 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/drivers/hid/wacom.h b/drivers/hid/wacom.h index 0c498c4..9159dd3 100644 --- a/drivers/hid/wacom.h +++ b/drivers/hid/wacom.h @@ -130,6 +130,7 @@ struct wacom_group_leds { u8 select; /* status led selector (0..3) */ struct wacom_led *leds; unsigned int count; + struct device *dev; }; struct wacom_battery { diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c index 2354d73..b88896c 100644 --- a/drivers/hid/wacom_sys.c +++ b/drivers/hid/wacom_sys.c @@ -1064,6 +1064,13 @@ static int wacom_led_register_one(struct device *dev, struct wacom *wacom, return 0; } +static void wacom_led_groups_release_one(void *data) +{ + struct wacom_group_leds *group = data; + + devres_release_group(group->dev, group); +} + static int wacom_led_groups_alloc_and_register_one(struct device *dev, struct wacom *wacom, int group_id, int count, @@ -1094,7 +1101,25 @@ static int wacom_led_groups_alloc_and_register_one(struct device *dev, goto err; } - devres_remove_group(dev, &wacom->led.groups[group_id]); + wacom->led.groups[group_id].dev = dev; + + devres_close_group(dev, &wacom->led.groups[group_id]); + + /* + * There is a bug (?) in devm_led_classdev_register() in which its + * increments the refcount of the parent. If the parent is an input + * device, that means the ref count never reaches 0 when + * devm_input_device_release() gets called. + * This means that the LEDs are still there after disconnect. + * Manually force the release of the group so that the leds are released + * once we are done using them. + */ + error = devm_add_action_or_reset(&wacom->hdev->dev, + wacom_led_groups_release_one, + &wacom->led.groups[group_id]); + if (error) + return error; + return 0; err: