From patchwork Sun Jul 17 07:05:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Takashi Iwai X-Patchwork-Id: 12920445 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 alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AE318C433EF for ; Sun, 17 Jul 2022 07:08:14 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id E8785190C; Sun, 17 Jul 2022 09:07:22 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz E8785190C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1658041693; bh=4LA61HFUZ5ylMHpHwi4q2rPcuHJOpqDKc4aP+W9+5dY=; h=From:To:Subject:Date:In-Reply-To:References:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=NflqOZeVueXWEH1EFGgrd0TIgpwNBEkvkdktNcirvkViazLECF7XFyFnHViVqkQyB CyDBdIvYnRqvjfEECHbzHkk2gRPfCYX4pfqPn1MBKfLgJCqik/RCEJK7G/bbXElXmb 9LjLcSXAd7TXJDgtC5oMIqY4AduMHbgF1jpK4n5Y= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id B163BF804D2; Sun, 17 Jul 2022 09:06:51 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 997ADF8055C; Sun, 17 Jul 2022 09:06:50 +0200 (CEST) Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 9DC96F804D2 for ; Sun, 17 Jul 2022 09:05:55 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 9DC96F804D2 Authentication-Results: alsa1.perex.cz; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b="habT3dOt"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="H3/ohKmM" Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 4F13D34490; Sun, 17 Jul 2022 07:05:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1658041555; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=IGZaCnSkWhN5wCIw32VPguw+G/ThT1KI9AXF1wzopkM=; b=habT3dOto5TkuPYRtdXVlRcwV7lpDmptAmzpTXJrq4qyq8T/lQWKAucWeC/CsobPLyfKHv oJkGy/KsHy04++ZebrTOsraEiSLpwDBWnFcRR1VLcBKJQrm+mGVaZwamWI61HDLWgZvAX5 quCkcfqcVNa5aMHSKTLQGqkzbxv1m7w= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1658041555; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=IGZaCnSkWhN5wCIw32VPguw+G/ThT1KI9AXF1wzopkM=; b=H3/ohKmMR64ElzFBxPTMWxqOKcK2OlIbQhSD8wmKQfqv5nyaTpxxUT7dgsoxKGN30Eh4G0 IrKpmHQ43nbh7lDQ== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 34C2213A89; Sun, 17 Jul 2022 07:05:55 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id aE8eDNO002LDawAAMHmgww (envelope-from ); Sun, 17 Jul 2022 07:05:55 +0000 From: Takashi Iwai To: alsa-devel@alsa-project.org Subject: [PATCH v2 3/5] ALSA: control: Drop async signal support Date: Sun, 17 Jul 2022 09:05:47 +0200 Message-Id: <20220717070549.5993-4-tiwai@suse.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220717070549.5993-1-tiwai@suse.de> References: <20220717070549.5993-1-tiwai@suse.de> MIME-Version: 1.0 X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" The async signal (SIGIO) support for ALSA control API has been never used by real applications, but yet it can be a cause of various potential deadlocks (although there hasn't been a bug report in this code path unlike timer and PCM). Let's drop the feature as the simplest solution to align with other APIs. Signed-off-by: Takashi Iwai --- include/sound/control.h | 1 - sound/core/control.c | 11 ----------- 2 files changed, 12 deletions(-) diff --git a/include/sound/control.h b/include/sound/control.h index fcd3cce673ec..0390d4952dac 100644 --- a/include/sound/control.h +++ b/include/sound/control.h @@ -109,7 +109,6 @@ struct snd_ctl_file { int preferred_subdevice[SND_CTL_SUBDEV_ITEMS]; wait_queue_head_t change_sleep; spinlock_t read_lock; - struct fasync_struct *fasync; int subscribed; /* read interface is activated */ struct list_head events; /* waiting events for read */ }; diff --git a/sound/core/control.c b/sound/core/control.c index 4dba3a342458..3d3b8bf93f80 100644 --- a/sound/core/control.c +++ b/sound/core/control.c @@ -181,7 +181,6 @@ void snd_ctl_notify(struct snd_card *card, unsigned int mask, _found: wake_up(&ctl->change_sleep); spin_unlock(&ctl->read_lock); - kill_fasync(&ctl->fasync, SIGIO, POLL_IN); } read_unlock_irqrestore(&card->ctl_files_rwlock, flags); } @@ -2129,14 +2128,6 @@ int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn) EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat); #endif -static int snd_ctl_fasync(int fd, struct file * file, int on) -{ - struct snd_ctl_file *ctl; - - ctl = file->private_data; - return fasync_helper(fd, file, on, &ctl->fasync); -} - /* return the preferred subdevice number if already assigned; * otherwise return -1 */ @@ -2264,7 +2255,6 @@ static const struct file_operations snd_ctl_f_ops = .poll = snd_ctl_poll, .unlocked_ioctl = snd_ctl_ioctl, .compat_ioctl = snd_ctl_ioctl_compat, - .fasync = snd_ctl_fasync, }; /* @@ -2302,7 +2292,6 @@ static int snd_ctl_dev_disconnect(struct snd_device *device) read_lock_irqsave(&card->ctl_files_rwlock, flags); list_for_each_entry(ctl, &card->ctl_files, list) { wake_up(&ctl->change_sleep); - kill_fasync(&ctl->fasync, SIGIO, POLL_ERR); } read_unlock_irqrestore(&card->ctl_files_rwlock, flags);