From patchwork Mon Nov 23 08:53:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Takashi Iwai X-Patchwork-Id: 11924589 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 75E2EC2D0E4 for ; Mon, 23 Nov 2020 08:57:29 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 53F4220738 for ; Mon, 23 Nov 2020 08:57:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="sUAGIAdq" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 53F4220738 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org 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 8D92E1616; Mon, 23 Nov 2020 09:56:36 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 8D92E1616 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1606121846; bh=/80Wxo3ZBHitJnvwBpweaPaqAkVaQ0AlbHTjkacSdjU=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=sUAGIAdqjEZsRQceLPSrN4dZS5fvmeYU2bcocEMKd832P7f7hhxjLb+OL5xzl5s8D 3esf9AUjGs3sVv2cfW5KyF1y5hWHSOpUP+v11+SwJcumtt4z1BY/VrnPE1VY3z6WPD ZJklJHB7ehgXOXhVBrtClsocN3oNRDp/L9iJ+DnU= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 7F4C9F80520; Mon, 23 Nov 2020 09:54:16 +0100 (CET) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 3030FF8051B; Mon, 23 Nov 2020 09:54:12 +0100 (CET) Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 0819CF8027C for ; Mon, 23 Nov 2020 09:53:59 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 0819CF8027C X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 1F634AF90; Mon, 23 Nov 2020 08:53:57 +0000 (UTC) From: Takashi Iwai To: alsa-devel@alsa-project.org Subject: [PATCH 05/41] ALSA: usb-audio: Add snd_usb_get_endpoint() helper Date: Mon, 23 Nov 2020 09:53:11 +0100 Message-Id: <20201123085347.19667-6-tiwai@suse.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20201123085347.19667-1-tiwai@suse.de> References: <20201123085347.19667-1-tiwai@suse.de> Cc: Matwey Kornilov , Dylan Robinson , Keith Milner 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" Factor out the code to obtain snd_usb_endpoint object matching with the given endpoint. It'll be used in the later patch to add the implicit feedback hw-constraint. No functional change by this patch itself. Tested-by: Keith Milner Tested-by: Dylan Robinson Signed-off-by: Takashi Iwai --- sound/usb/endpoint.c | 36 +++++++++++++++++++++++++++--------- sound/usb/endpoint.h | 4 ++++ 2 files changed, 31 insertions(+), 9 deletions(-) diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index e2f9ce2f5b8b..cf00871fd278 100644 --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -439,6 +439,26 @@ static void snd_complete_urb(struct urb *urb) clear_bit(ctx->index, &ep->active_mask); } +/* + * Get the existing endpoint object corresponding EP, iface and alt numbers + * Returns NULL if not present. + * Call inside chip->mutex locking for avoiding the race. + */ +struct snd_usb_endpoint * +snd_usb_get_endpoint(struct snd_usb_audio *chip, + int ep_num, int iface, int altsetting) +{ + struct snd_usb_endpoint *ep; + + list_for_each_entry(ep, &chip->ep_list, list) { + if (ep->ep_num == ep_num && + ep->iface == iface && + ep->altsetting == altsetting) + return ep; + } + return NULL; +} + /** * snd_usb_add_endpoint: Add an endpoint to an USB audio chip * @@ -470,15 +490,13 @@ struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip, mutex_lock(&chip->mutex); - list_for_each_entry(ep, &chip->ep_list, list) { - if (ep->ep_num == ep_num && - ep->iface == alts->desc.bInterfaceNumber && - ep->altsetting == alts->desc.bAlternateSetting) { - usb_audio_dbg(ep->chip, - "Re-using EP %x in iface %d,%d @%p\n", - ep_num, ep->iface, ep->altsetting, ep); - goto __exit_unlock; - } + ep = snd_usb_get_endpoint(chip, ep_num, + alts->desc.bInterfaceNumber, + alts->desc.bAlternateSetting); + if (ep) { + usb_audio_dbg(ep->chip, "Re-using EP %x in iface %d,%d @%p\n", + ep_num, ep->iface, ep->altsetting, ep); + goto __exit_unlock; } usb_audio_dbg(chip, "Creating new %s %s endpoint #%x\n", diff --git a/sound/usb/endpoint.h b/sound/usb/endpoint.h index d23fa0a8c11b..61487095a766 100644 --- a/sound/usb/endpoint.h +++ b/sound/usb/endpoint.h @@ -5,6 +5,10 @@ #define SND_USB_ENDPOINT_TYPE_DATA 0 #define SND_USB_ENDPOINT_TYPE_SYNC 1 +struct snd_usb_endpoint *snd_usb_get_endpoint(struct snd_usb_audio *chip, + int ep_num, int iface, + int altsetting); + struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip, struct usb_host_interface *alts, int ep_num, int direction, int type);