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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 5599AC43381 for ; Wed, 23 Dec 2020 02:34:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3EF0B2245C for ; Wed, 23 Dec 2020 02:34:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730730AbgLWCeD (ORCPT ); Tue, 22 Dec 2020 21:34:03 -0500 Received: from mail.kernel.org ([198.145.29.99]:54254 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729261AbgLWCY7 (ORCPT ); Tue, 22 Dec 2020 21:24:59 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id C25792222D; Wed, 23 Dec 2020 02:24:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1608690283; bh=ZVKz6YYdYlSmUSkdGxVvR4U/1tFvgjIlZOECnL+jpz8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eYsrdNEziAqp79Vaxv/Ix9pogI5rFzcY0JyBbG71T8GZtdqcoF/o+6vmUM2B833dw cqiVR3dFtBHD21HVTJc4wP83w2tBGv7yhqTP+p+FB/+Apz4eVKlQLiRPI53TN0P178 01fpb6xJohFMABXFY8oAALWiR2Wgwh4XOIsxGrtUJ/XXhNPjzsX7kKWp3uIyQGoQEe ViTxSBYpvBhiiF/2LT4I7kn6h6XTrGDAQ63aFQvHI6zAePt/R1rfN63D6sdAQ8ichy wM3844fxzSGw92xHT5qQ7WN1qlPokiG5DcvJYGn810DHPLrU03Y3XwycKEj5+Ts/Ra rqZvykV2cVgAw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Takashi Iwai , Keith Milner , Dylan Robinson , Sasha Levin , alsa-devel@alsa-project.org Subject: [PATCH AUTOSEL 4.9 22/48] ALSA: usb-audio: Don't call usb_set_interface() at trigger callback Date: Tue, 22 Dec 2020 21:23:50 -0500 Message-Id: <20201223022417.2794032-22-sashal@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20201223022417.2794032-1-sashal@kernel.org> References: <20201223022417.2794032-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Takashi Iwai [ Upstream commit 4974b7950929e4a28d4eaee48e4ad07f168ac132 ] The PCM trigger callback is atomic, hence we must not call a function like usb_set_interface() there. Calling it from there would lead to a kernel Oops. Fix it by moving the usb_set_interface() call to set_sync_endpoint(). Also, apply the snd_usb_set_interface_quirk() for consistency, too. Tested-by: Keith Milner Tested-by: Dylan Robinson Link: https://lore.kernel.org/r/20201123085347.19667-3-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/usb/pcm.c | 28 +++++++++++++--------------- 1 file changed, 13 insertions(+), 15 deletions(-) diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index 95d02e25a3133..77c704847e4ac 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -242,21 +242,6 @@ static int start_endpoints(struct snd_usb_substream *subs) !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) { struct snd_usb_endpoint *ep = subs->sync_endpoint; - if (subs->data_endpoint->iface != subs->sync_endpoint->iface || - subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) { - err = usb_set_interface(subs->dev, - subs->sync_endpoint->iface, - subs->sync_endpoint->altsetting); - if (err < 0) { - clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags); - dev_err(&subs->dev->dev, - "%d:%d: cannot set interface (%d)\n", - subs->sync_endpoint->iface, - subs->sync_endpoint->altsetting, err); - return -EIO; - } - } - dev_dbg(&subs->dev->dev, "Starting sync EP @%p\n", ep); ep->sync_slave = subs->data_endpoint; @@ -499,6 +484,19 @@ static int set_sync_endpoint(struct snd_usb_substream *subs, subs->data_endpoint->sync_master = subs->sync_endpoint; + if (subs->data_endpoint->iface != subs->sync_endpoint->iface || + subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting) { + err = usb_set_interface(subs->dev, + subs->sync_endpoint->iface, + subs->sync_endpoint->altsetting); + if (err < 0) + return err; + dev_dbg(&dev->dev, "setting usb interface %d:%d\n", + subs->sync_endpoint->iface, + subs->sync_endpoint->altsetting); + snd_usb_set_interface_quirk(dev); + } + return 0; } -- 2.27.0