From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:50446 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751455AbdKJNzB (ORCPT ); Fri, 10 Nov 2017 08:55:01 -0500 Subject: Patch "ALSA: seq: Avoid invalid lockdep class warning" has been added to the 4.13-stable tree To: tiwai@suse.de, gregkh@linuxfoundation.org, syzkaller@googlegroups.com Cc: , From: Date: Fri, 10 Nov 2017 14:55:01 +0100 Message-ID: <151032210120674@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled ALSA: seq: Avoid invalid lockdep class warning to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: alsa-seq-avoid-invalid-lockdep-class-warning.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 3510c7aa069aa83a2de6dab2b41401a198317bdc Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Mon, 6 Nov 2017 20:16:50 +0100 Subject: ALSA: seq: Avoid invalid lockdep class warning From: Takashi Iwai commit 3510c7aa069aa83a2de6dab2b41401a198317bdc upstream. The recent fix for adding rwsem nesting annotation was using the given "hop" argument as the lock subclass key. Although the idea itself works, it may trigger a kernel warning like: BUG: looking up invalid subclass: 8 .... since the lockdep has a smaller number of subclasses (8) than we currently allow for the hops there (10). The current definition is merely a sanity check for avoiding the too deep delivery paths, and the 8 hops are already enough. So, as a quick fix, just follow the max hops as same as the max lockdep subclasses. Fixes: 1f20f9ff57ca ("ALSA: seq: Fix nested rwsem annotation for lockdep splat") Reported-by: syzbot Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- include/sound/seq_kernel.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/include/sound/seq_kernel.h +++ b/include/sound/seq_kernel.h @@ -49,7 +49,8 @@ typedef union snd_seq_timestamp snd_seq_ #define SNDRV_SEQ_DEFAULT_CLIENT_EVENTS 200 /* max delivery path length */ -#define SNDRV_SEQ_MAX_HOPS 10 +/* NOTE: this shouldn't be greater than MAX_LOCKDEP_SUBCLASSES */ +#define SNDRV_SEQ_MAX_HOPS 8 /* max size of event size */ #define SNDRV_SEQ_MAX_EVENT_LEN 0x3fffffff Patches currently in stable-queue which might be from tiwai@suse.de are queue-4.13/alsa-seq-avoid-invalid-lockdep-class-warning.patch queue-4.13/alsa-hda-fix-headset-mic-problem-for-dell-machines-with-alc274.patch queue-4.13/alsa-timer-limit-max-instances-per-timer.patch queue-4.13/alsa-seq-fix-oss-sysex-delivery-in-oss-emulation.patch queue-4.13/alsa-usb-audio-support-new-amanero-combo384-firmware-version.patch