From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7B3CEC3A59D for ; Sat, 22 Oct 2022 07:36:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230125AbiJVHgy (ORCPT ); Sat, 22 Oct 2022 03:36:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48150 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230253AbiJVHg3 (ORCPT ); Sat, 22 Oct 2022 03:36:29 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 52FF036DD5; Sat, 22 Oct 2022 00:35:12 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 2A123B82DEF; Sat, 22 Oct 2022 07:35:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 65988C433D6; Sat, 22 Oct 2022 07:35:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666424107; bh=8fi4KRnTeAjrn2RZpFpUaMqKpGr4C7VXsqZt/H77q6U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uyenJxijD2Whif/fKhAg65xur7rVaqr9O8y6TOVV4gtMCw9u++ckorYghGGbf8OH4 V87bU5MbMfhMHLHlP+JVTSm2pybgcjkM2WNi18WFyngwp/bFJKHEOGPtxulZ1LqU7B FHutiANflQ2GMW0s2azv3lwdoFPIVbt+iPca243s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Takashi Iwai Subject: [PATCH 5.19 003/717] ALSA: rawmidi: Drop register_mutex in snd_rawmidi_free() Date: Sat, 22 Oct 2022 09:18:02 +0200 Message-Id: <20221022072415.630907767@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221022072415.034382448@linuxfoundation.org> References: <20221022072415.034382448@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Takashi Iwai commit a70aef7982b012e86dfd39fbb235e76a21ae778a upstream. The register_mutex taken around the dev_unregister callback call in snd_rawmidi_free() may potentially lead to a mutex deadlock, when OSS emulation and a hot unplug are involved. Since the mutex doesn't protect the actual race (as the registration itself is already protected by another means), let's drop it. Link: https://lore.kernel.org/r/CAB7eexJP7w1B0mVgDF0dQ+gWor7UdkiwPczmL7pn91xx8xpzOA@mail.gmail.com Cc: Link: https://lore.kernel.org/r/20221011070147.7611-1-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/core/rawmidi.c | 2 -- 1 file changed, 2 deletions(-) --- a/sound/core/rawmidi.c +++ b/sound/core/rawmidi.c @@ -1835,10 +1835,8 @@ static int snd_rawmidi_free(struct snd_r snd_info_free_entry(rmidi->proc_entry); rmidi->proc_entry = NULL; - mutex_lock(®ister_mutex); if (rmidi->ops && rmidi->ops->dev_unregister) rmidi->ops->dev_unregister(rmidi); - mutex_unlock(®ister_mutex); snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]); snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);