From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 228D82500BA; Mon, 10 Feb 2025 17:43:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739209408; cv=none; b=LrQEb7l7KIZ8adqq+8jPpbZ2mpJ15gad8wX3bh7M+PDpYJXScYx2wC9H9G5Bl4+o4gSLx1EzucMeewdCZTis4Xf2Ftsan1KhjXe8lzRhDBh6L0h9NfxxEwG0YI6BbM6mLMscnmyn0Ce+UNkKBwJpnQMq4x1hfoa61lUdb6zfnZY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739209408; c=relaxed/simple; bh=XQfIVqMXGtFLiIZ5YdMD28vM54crvwUo7bL3shsfXMo=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=jkr4NYtf0psICUVVUbynlok+UmYPQ2VZBIO5Ov+9Zb5MSJtGk78f42DmY9QjWLGS7LicOVvXle0J+Wy+gbk4vUfI6TxF4LTBfjQID0eBvR3wUMizZnlnxgT+dAXHs88VwJDvJmlykwv73Awg123s6hHqzCTwz0rvnfzZjumNBcQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ODw/PBDM; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ODw/PBDM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 41952C4CED1; Mon, 10 Feb 2025 17:43:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1739209408; bh=XQfIVqMXGtFLiIZ5YdMD28vM54crvwUo7bL3shsfXMo=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=ODw/PBDMJLnpTtLG9xR5HWdZAmESh2w6x9fRX22guCAayI+nF0MgHtXRZLkoIarac AB/1oqPCOnYiZqrXiWv9VvO3K2mZDddXEs5/oIqEhKAqA3IU8rXnmDbJDtVgP1+Maf D/qUVxNCUcgZif2bTEwbdCo3lbjxnCqMxkQjZ4Jt4McXauwmm8TVOWxh7kaBogtuSl y0uVhy2M6C8L/eCpvBJIgO9SI1QX30EFAYKAdK3gEh7/H3LD9+cLATHqxbGHXnircx v4fZjmRc2eFqsLikSovEzGTIKendYtvbp/xaphRV4AbtCG8b4brhChCZ4Q9NkwG7QF kHvZjsKrusl1A== Message-ID: <0bc098bf-6c02-4d62-bcb1-939e1f0b9f95@kernel.org> Date: Mon, 10 Feb 2025 18:43:24 +0100 Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5] HID: corsair-void: Add Corsair Void headset family driver To: Stuart Cc: linux-input@vger.kernel.org, Jiri Kosina , Benjamin Tissoires , Christophe JAILLET , linux-kernel@vger.kernel.org References: <20241008233030.395126-3-stuart.a.hayhurst@gmail.com> <5cf187db-1eae-41a8-a33e-ef68a4f66db6@kernel.org> Content-Language: en-US From: Jiri Slaby Autocrypt: addr=jirislaby@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10. 02. 25, 17:15, Stuart wrote: >> This effectively kills the system. We came here via: >> corsair_void_raw_event (hid_driver::raw_event) >> -> corsair_void_process_receiver >> -> scoped_guard(mutex, &drvdata->battery_mutex) > >> And hid_driver::raw_event can be called from the interrupt context. This >> happened at: > > Damn it, I was suspicious that it was too easy. It's been running for a year > without an issue on my system, I'll clearly have to read a bit more. > > I'm not sure what the best solution is for this. > 'corsair_void_process_receiver()' shouldn't be called frequently, and > the locks shouldn't be waiting on each other very often, so I suppose > swapping the mutex for a spinlock is probably the best option, instead of > increasing code complexity? Not that easy, as AFAIR power unregister cannot sleep. -- js suse labs