From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy1-f172.google.com (mail-dy1-f172.google.com [74.125.82.172]) (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 A00B814BF92 for ; Sun, 31 May 2026 04:25:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780201534; cv=none; b=ZVHI0kNXuHZ7NTrlCPlIYU93yWh8Y/eAX+mdMLHMPREQA8K/t06ZZp5YREfSD+N8JvA3fguIqgNh5mbThlLENjZi/IUAbWqjKXyVg1cLThFjiBkiZuwtMr63eGqVwiAa/Pq34ANwO/+sPRc6tuqy7qdGHjop79eP9eRWdZYLUg0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780201534; c=relaxed/simple; bh=FQrHc7/WACHtQhLJsx/v+kkrVB2a5rej4lOPYVo0LnI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=PpZaW/di2Hpl7MLe1U7Egl9z630ipyLZkPwUbZnL8mhTicq+z+vMxoXmG+HIYey7UlXcxoYKsWyHSJ0VfBNo7lyGhTuThUR0AMopbZ6fl3xCIA0BYpuOslBwM8Na81NQc32PqPc3q21XElzUqjZNEVD6R4qlTkVZ4bVpGDtFVMY= 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=AgpkVZmG; arc=none smtp.client-ip=74.125.82.172 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="AgpkVZmG" Received: by mail-dy1-f172.google.com with SMTP id 5a478bee46e88-304d8362a58so1983788eec.1 for ; Sat, 30 May 2026 21:25:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1780201533; x=1780806333; darn=vger.kernel.org; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=mfXUlA4q1Rnkp6HcFZLfh12tpxz5WVB+RVOLL/F8nHA=; b=AgpkVZmG0pIHq6rR4hylRzv9wSql0c7w2XUcI7uIqPs7db9pPVq4LOCgpwjBsoQN6F occa+sUecVpfiNMSeFKGnpW07r91i42D61PQB7XPw59jblwydRd7sVoAVmT2YF2Lvrel Y9X5frVnxipWK6ryV21iAuS033WnCFk2Mw10nYXARUi1vAzz3wjOKFFl1v3WDjwq3tac O6Zbpg0erAP3K4AokMq6EaA8uBaA3VsLVUSkgVA9qtgWsQXywCD6N5q1sgSQKoNwdgoT ktd1P3LNfKC1cP4Oi5KF03fJjEyQ7Ld5qMERCvb8DgtiCJA31xuJtV0CDC4dNkrXjBPX pJkA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780201533; x=1780806333; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=mfXUlA4q1Rnkp6HcFZLfh12tpxz5WVB+RVOLL/F8nHA=; b=a/JiP4sqr9MEIUC8X0irpmLNGZDSmIO7GL3juO9/lPDtvo2gSxJcwlv5yj3GXwktw2 eWE6g+NDrQ/sKOP9HxZK5MZEpz+QsMGBLuwBwioaFEr1cSmweZVRdvQYzSSfVzvUjN4N vyuPEWpKx4ZBXeGcaN3PsF03uc2zIC5pOE/XfDHzLLSPKebSg5f93rRFkys3fOdjqWoI sdG/LUVO71WUZMeGiXP5j+T/eVRtf1nBpklGvpTKvMhRSCHMvuxG0QRI41dF/jrRZ3Hn PVbY3I1xTmN1mnxJw0UmQlf6TJLc02WETeAkDgy+nXvGSxX5XZWpO9iyHStK0nu96s1d ryKw== X-Forwarded-Encrypted: i=1; AFNElJ8qWDrr5iva0QbsXgorJEbYX2l4ffdnXWA/qFhSKcYkebkMn1RGmI1x7Q2yBPI+R0VX/h5hUU5fer7rwQ==@vger.kernel.org X-Gm-Message-State: AOJu0Yw+3BlggN6CU2Zc8oXw+3BWswlvqsPP7G4ryLMxuhtGVvYFe9mc 3x/HAE+tPSvqMfQQu0fT6HLdYFYPpLCiuVv41bojV7gK1SbFORd5u1OF X-Gm-Gg: Acq92OEkU/+SGd6uOXO+fz+Kqlvx7NaUjXQFndlwHZ3+dmGF0gjiRha+oERiOrpQd3V Sq1aF6nN2Z5Uq0pZjRUE4rWP2hoJ5fo+IPArgwp28eOQOA/cjNm6X/BObD9wZEnKAGJwTcpggMj dyt5B+elaBtV8zWdyPfrn61ieyPjG6STfITucJQvhcUAAzBp1jN9veE655EHncN/u0hTQ8X7DEy pYTJ8uog0eW5aX2Co73P6u9XUJqQPQ5iJGWUPI30vRcxhqEMqTEiHQopwSaSP/FSMrhNplR+Zad yOR1tKyy4lynNZk5Slz5/KcHi71djQD4ea2iFny0i/IzYPvG3ew3Co5QXcwejcuuOma0XEGY+ZM IaZQqGvONZ2G8zgOF/cKRvzcZftBSCkscSDe2WpF8o6QHG1H99ZjGrPxAeQoLkDH+cMhp/59lGm SiHGxtmTRVh3DZaJkZZalqI4QvJrKKMIXuMS9Ru7X4YsVIUfhX6IGgfFN+WYA9BlJRYhEmhk1lP A== X-Received: by 2002:a05:7300:6da2:b0:302:b44b:b64a with SMTP id 5a478bee46e88-304fb1a66fcmr2160397eec.1.1780201532584; Sat, 30 May 2026 21:25:32 -0700 (PDT) Received: from google.com ([2a00:79e0:2ebe:8:aa7b:13a9:ea74:503]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-304ed5b8fbbsm5483650eec.26.2026.05.30.21.25.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 30 May 2026 21:25:31 -0700 (PDT) Date: Sat, 30 May 2026 21:25:28 -0700 From: Dmitry Torokhov To: Jinmo Yang Cc: Ping Cheng , Jason Gerecke , Jiri Kosina , Benjamin Tissoires , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH] HID: wacom: use GFP_ATOMIC in wacom_wac_queue_flush() Message-ID: References: <20260530155930.128183-1-jinmo44.yang@gmail.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260530155930.128183-1-jinmo44.yang@gmail.com> Hi Jinmo, On Sun, May 31, 2026 at 12:59:30AM +0900, Jinmo Yang wrote: > wacom_wac_queue_flush() is called via the .raw_event callback > (wacom_raw_event → wacom_wac_pen_serial_enforce → wacom_wac_queue_flush). > For USB HID devices, this callback is invoked from hid_irq_in(), which > is a URB completion handler running in atomic context. Using GFP_KERNEL > in this path can sleep, leading to a "scheduling while atomic" bug. > > Use GFP_ATOMIC instead. The existing code already handles allocation > failure by skipping the fifo entry and continuing. > > Suggested-by: Dmitry Torokhov If you want to give credit this should be "Reported-by: Sashiko-bot <...>". > Fixes: 5e013ad20689 ("HID: wacom: Remove static WACOM_PKGLEN_MAX limit") > Cc: stable@vger.kernel.org > Signed-off-by: Jinmo Yang > --- > drivers/hid/wacom_sys.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c > index a32320b35..2e237bdd2 100644 > --- a/drivers/hid/wacom_sys.c > +++ b/drivers/hid/wacom_sys.c > @@ -74,7 +74,7 @@ static void wacom_wac_queue_flush(struct hid_device *hdev, > unsigned int count; > int err; > > - buf = kzalloc(size, GFP_KERNEL); > + buf = kzalloc(size, GFP_ATOMIC); > if (!buf) { > kfifo_skip(fifo); > continue; Reviewed-by: Dmitry Torokhov As a followup please consider changing 'buf' management to use cleanup facilities: u8 *buf __free(kfree) = kzalloc(size, GFP_ATOMIC); if (!buf) { kfifo_skiip(fifo); continue; } ... Thanks. -- Dmitry