From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f50.google.com (mail-pj1-f50.google.com [209.85.216.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 880EC43A81E for ; Mon, 3 Aug 2026 18:46:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.50 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785782810; cv=none; b=XY7ryaHr1seD2eCrfFvuB46q4olgWexAFGb8sk0sqGhvU8kmDuJjU+rCNQLmJWGbjiAexiETMfQetppVR0M7iAbJXGztexEq31Wd8dJXnbJNUtBwe+yDwLyg2H4I+y7tkXBk7VbqN6nHKuvghwKj4svxlX+u5+ZowG5IJOgMgGc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785782810; c=relaxed/simple; bh=v7TqxLgBA7wkrh0lpbqWkH+WYHzABumUa7WM8oNwkxo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=uaolURkqZrNknBxxAysdfRk9TW00Kgyk1Lhzw7c//h7rbxNp2PEHLnnQEEpNbmxBjSaQ9KUlqjvqHVJ/Lh9V4UX9PFf/jhIpHCIJAxahLJjCjO+guIkvBFxKVoMgMd4R1WO7KONvMwBthga8y0kRq613tmUDTKUY4Yb5H0WWVtQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=McDDjGfk; arc=none smtp.client-ip=209.85.216.50 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="McDDjGfk" Received: by mail-pj1-f50.google.com with SMTP id 98e67ed59e1d1-38dc69c74b8so3556363a91.0 for ; Mon, 03 Aug 2026 11:46:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1785782805; x=1786387605; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :content-type:mime-version:subject:date:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=XII8xKdk1EK6oOq1Wzl11N5mboBPK8ToSXyj9I3cUDA=; b=McDDjGfkx5cBd3TPb/t5SRDVxcVcW1mEqXLcs+Ae1zJf2IxBCT2K8A8lZAJ2JpJu2C M4dPyFc/BX96Hs8ewslaRUAQDj5LWIFCmvr8EKkLJCxtIsVsUkxCg3WAFihQh0JGKnIi 3D00JOUFiFRIPhRjadzjEVsOh3jJnDRQbE3SzO3ZkPCdec4G8BTmPLqVEvbWEWReI0oj /oEHgKQOQJ8a3ksX4GPn5URYP9dbaoEztLKbXowEcB5gWUG5n436s8Qxk/DEX93QamHT DwrJaWWqrQ0YoZtgYyrgpx/hv9kuyG5OiGQLrsRwMx2QZDE3sJNF1LrpG15WrJq9PBNl xSFg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785782805; x=1786387605; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :content-type:mime-version:subject:date:from:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=XII8xKdk1EK6oOq1Wzl11N5mboBPK8ToSXyj9I3cUDA=; b=mKoNRYTIOtgzUrFT6SqquCQcI3tsJf+lBDjmH4kPaJwcqirVt5Nbnlt5yuKrJ5+E1S kl3ENru6Z9vMjeSnwSR/WrpdtmS6u39paxvnRK5J+bs0+xGTZzAj2Wi2XipGp0QuecJw vFxTOSXxK2ii9bO9HD5YIFsWNUCQaXhXPRt2QAB+3qATDNoGi14HE5wPMzOd81hKNNOH PPPGZ3yrD3gwPC8+q3OtBW6oB2vSTLFiLGjx774d577gAcFsvGOqU+0x5phNr3Lv2On/ U7PqUNyOTy0aRI/ezp2xhW2XW72BXgzVd4yNHRf5OJF0v/4a8tgYtSc/oRXXANyqPMkv XZ8Q== X-Forwarded-Encrypted: i=1; AHgh+RocoBAbqW0K3wFE2+xSZorpXmpEIkqEkCCMst05pUkWfQiHN89fxMk/Ut0mO/ppQG32FvwsHanfl3g=@vger.kernel.org X-Gm-Message-State: AOJu0YwS6+C/C9i+PdYF0avaLLbGJ6Z1SOrBzqRZf644ehQXj/l8SDIp HkP/MwIJxBe7OhjiuZJ+XtT9hZ2Lj/51z5/A20YcC0hFa9qlHC9AiNhd X-Gm-Gg: AR+sD11hv/Z3JFgcgvvz+pRae5+so3Y0ty7zCo74T7SaNTe4Shcfi54YNxp1URw3VFY jwaYoFn1qzdmtKDRsI1FXMCj/NERB79evooev0TRQhoB3w96Wt7inEhlU/kzJ10PNqO0s09hV0o ETzM875OlyccX3vCDlBNTvWAlii/NFydVkCrC9IEdXei8G16FDNqQrmUcPedBEpryKp/QzmizzE 4e7bCNvi+EZeCQhsdycR/A/r3qkSNymX117g1lUDYu/7Yz3b1LCWTPO+h0+5UaU7QP9RVMqgpsQ 6pkSHp2YFwmOcLWr/hhNcBPlI1vRktHkU4Bk/cjuCrUj0HN5b4YfoTvDS33gklTrRX4dXaTcbs6 AbnssPODfd2nTL91Mr2RQ7ZK6VH0cv+BBre3uFu9RgNXAPrAMzOs7rOj7AqZCXZttBbD1Q9+6Vm I1Hbv7vDACa0VoB1BFuBQvk6pbIGVNegV+P9/zloP4xnArq8EF5qAG0awfMu1ZflvUARXBZJDfF V/hpIUsFdGz9Vtu5F1XxUFHjTKZHAXb4Zxbp2qJHvV8iFagZhev X-Received: by 2002:a17:90b:53c5:b0:38e:85fb:71b9 with SMTP id 98e67ed59e1d1-38fbc3f9aa9mr10534877a91.4.1785782805317; Mon, 03 Aug 2026 11:46:45 -0700 (PDT) Received: from dtor-ws.sjc.corp.google.com ([2a00:79e0:2ebe:8:d109:cdba:8a20:74ad]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-13fab24ec10sm33935472c88.6.2026.08.03.11.46.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Aug 2026 11:46:44 -0700 (PDT) From: Dmitry Torokhov Date: Mon, 03 Aug 2026 11:46:33 -0700 Subject: [PATCH 08/21] HID: gaff: move FF initialization to .input_configured() Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260803-hid-ff-input-configured-v1-8-1dc9bbacd88c@gmail.com> References: <20260803-hid-ff-input-configured-v1-0-1dc9bbacd88c@gmail.com> In-Reply-To: <20260803-hid-ff-input-configured-v1-0-1dc9bbacd88c@gmail.com> To: Jiri Kosina , Benjamin Tissoires , Jonathan Corbet , Shuah Khan , Julia Lawall , Nicolas Palix , =?utf-8?q?Filipe_La=C3=ADns?= , Bastien Nocera Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, cocci@inria.fr X-Mailer: b4 0.16-dev-b242f The driver currently initializes force-feedback in its probe() function after calling hid_hw_start() with HID_CONNECT_DEFAULT. This is racy as the input device is already registered and visible to userspace at that point. Move the FF initialization to the .input_configured() callback to ensure the device is fully prepared before registration. Assisted-by: Gemini:gemini-3.1-pro Signed-off-by: Dmitry Torokhov --- drivers/hid/hid-gaff.c | 53 ++++++++++---------------------------------------- 1 file changed, 10 insertions(+), 43 deletions(-) diff --git a/drivers/hid/hid-gaff.c b/drivers/hid/hid-gaff.c index 8b99686b63df..ec793a179b47 100644 --- a/drivers/hid/hid-gaff.c +++ b/drivers/hid/hid-gaff.c @@ -60,32 +60,23 @@ static int hid_gaff_play(struct input_dev *dev, void *data, return 0; } -static int gaff_init(struct hid_device *hid) +static int gaff_input_configured(struct hid_device *hid, struct hid_input *hidinput) { struct gaff_device *gaff; struct hid_report *report; - struct hid_input *hidinput; struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; - struct list_head *report_ptr = report_list; - struct input_dev *dev; + struct input_dev *dev = hidinput->input; int error; - if (list_empty(&hid->inputs)) { - hid_err(hid, "no inputs found\n"); - return -ENODEV; - } - hidinput = list_entry(hid->inputs.next, struct hid_input, list); - dev = hidinput->input; + if (!list_is_first(&hidinput->list, &hid->inputs)) + return 0; - if (list_empty(report_list)) { + report = list_first_entry_or_null(report_list, struct hid_report, list); + if (!report) { hid_err(hid, "no output reports found\n"); return -ENODEV; } - - report_ptr = report_ptr->next; - - report = list_entry(report_ptr, struct hid_report, list); if (report->maxfield < 1) { hid_err(hid, "no fields in the report\n"); return -ENODEV; @@ -100,6 +91,7 @@ static int gaff_init(struct hid_device *hid) if (!gaff) return -ENOMEM; + gaff->report = report; set_bit(FF_RUMBLE, dev->ffbit); error = input_ff_create_memless(dev, gaff, hid_gaff_play); @@ -108,7 +100,6 @@ static int gaff_init(struct hid_device *hid) return error; } - gaff->report = report; gaff->report->field[0]->value[0] = 0x51; gaff->report->field[0]->value[1] = 0x00; gaff->report->field[0]->value[2] = 0x00; @@ -125,37 +116,13 @@ static int gaff_init(struct hid_device *hid) return 0; } #else -static inline int gaff_init(struct hid_device *hdev) +static inline int gaff_input_configured(struct hid_device *hdev, + struct hid_input *hidinput) { return 0; } #endif -static int ga_probe(struct hid_device *hdev, const struct hid_device_id *id) -{ - int ret; - - dev_dbg(&hdev->dev, "Greenasia HID hardware probe..."); - - ret = hid_parse(hdev); - if (ret) { - hid_err(hdev, "parse failed\n"); - goto err; - } - - ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF); - if (ret) { - hid_err(hdev, "hw start failed\n"); - goto err; - } - - gaff_init(hdev); - - return 0; -err: - return ret; -} - static const struct hid_device_id ga_devices[] = { { HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012), }, { } @@ -165,7 +132,7 @@ MODULE_DEVICE_TABLE(hid, ga_devices); static struct hid_driver ga_driver = { .name = "greenasia", .id_table = ga_devices, - .probe = ga_probe, + .input_configured = gaff_input_configured, }; module_hid_driver(ga_driver); -- 2.55.0.629.g250fe7f194-goog