From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 37ED433EC for ; Mon, 16 Jan 2023 15:59:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AC105C433EF; Mon, 16 Jan 2023 15:59:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673884788; bh=0DOa9EAbWhG+o10onX0D6iLzZuuvud+JPATEwSwKjvc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=txQuTpd6TVE3VavpUlimmC0O/HDlfl0yByOSCRQgzSJv4EFcrWJ+xg/MAv54G8SPT 3KtVXMrq+SxXmfkJYK+mjQbH2uE//5U4YcHp1u0+3aKfLh69ANikYlNEIdohil83B8 M2mFiUz8dXHYte/XOEKujCSXi9rdFJ4QhjTTLgWs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Takashi Iwai , Sasha Levin Subject: [PATCH 6.1 109/183] ALSA: usb-audio: Make sure to stop endpoints before closing EPs Date: Mon, 16 Jan 2023 16:50:32 +0100 Message-Id: <20230116154807.976753184@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154803.321528435@linuxfoundation.org> References: <20230116154803.321528435@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Takashi Iwai [ Upstream commit 0599313e26666e79f6e7fe1450588431b8cb25d5 ] At the PCM hw params, we may re-configure the endpoints and it's done by a temporary EP close followed by re-open. A potential problem there is that the EP might be already running internally at the PCM prepare stage; it's seen typically in the playback stream with the implicit feedback sync. As this stream start isn't tracked by the core PCM layer, we'd need to stop it explicitly, and that's the missing piece. This patch adds the stop_endpoints() call at snd_usb_hw_params() to assure the stream stop before closing the EPs. Fixes: bf6313a0ff76 ("ALSA: usb-audio: Refactor endpoint management") Link: https://lore.kernel.org/r/4e509aea-e563-e592-e652-ba44af6733fe@veniogames.com Link: https://lore.kernel.org/r/20230102170759.29610-2-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/usb/pcm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index d2c652aa1385..535eb95bc9ee 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -527,6 +527,8 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream, if (snd_usb_endpoint_compatible(chip, subs->data_endpoint, fmt, hw_params)) goto unlock; + if (stop_endpoints(subs, false)) + sync_pending_stops(subs); close_endpoints(chip, subs); } -- 2.35.1