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 X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 7474AC43470 for ; Wed, 5 May 2021 12:14:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4560A61176 for ; Wed, 5 May 2021 12:14:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234187AbhEEMO5 (ORCPT ); Wed, 5 May 2021 08:14:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:50458 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233486AbhEEMKi (ORCPT ); Wed, 5 May 2021 08:10:38 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5FDBF6044F; Wed, 5 May 2021 12:09:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620216579; bh=gvTN5d7BbQ0bFTkpZ6pcrdXmWDneK6Q6FrIZjm3RX3Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vl1S2VciNHW9/+K6ziG3zF9+/SBG/232EMIS/4LALAtOLq2gTOu6qRZE1t+nB1qez 1Qa9zDlQQ9nWo6ObVeI9TbDPQeB9XehaZIyfNQ9VfuCrxx6MwF769spv6Etj0uM38b XEPNzdPqFEtR7Xi+XNk3fPDRH/YHzr3drak1qVWU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Takashi Iwai , Lucas Endres Subject: [PATCH 5.11 25/31] ALSA: usb-audio: Fix implicit sync clearance at stopping stream Date: Wed, 5 May 2021 14:06:14 +0200 Message-Id: <20210505112327.509156262@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210505112326.672439569@linuxfoundation.org> References: <20210505112326.672439569@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Takashi Iwai commit 988cc17552606be67a956cf8cd6ff504cfc5d643 upstream. The recent endpoint management change for implicit feedback mode added a clearance of ep->sync_sink (formerly ep->sync_slave) pointer at snd_usb_endpoint_stop() to assure no leftover for the feedback from the already stopped capture stream. This turned out to cause a regression, however, when full-duplex streams were running and only a capture was stopped. Because of the above clearance of ep->sync_sink pointer, no more feedback is done, hence the playback will stall. This patch fixes the ep->sync_sink clearance to be done only after all endpoints are released, for addressing the regression. Reported-and-tested-by: Lucas Endres Fixes: bf6313a0ff76 ("ALSA: usb-audio: Refactor endpoint management") Cc: Link: https://lore.kernel.org/r/20210426063349.18601-1-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/usb/endpoint.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -1442,11 +1442,11 @@ void snd_usb_endpoint_stop(struct snd_us if (snd_BUG_ON(!atomic_read(&ep->running))) return; - if (ep->sync_source) - WRITE_ONCE(ep->sync_source->sync_sink, NULL); - - if (!atomic_dec_return(&ep->running)) + if (!atomic_dec_return(&ep->running)) { + if (ep->sync_source) + WRITE_ONCE(ep->sync_source->sync_sink, NULL); stop_urbs(ep, false); + } } /**