From patchwork Thu Jun 24 21:20:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Chancellor X-Patchwork-Id: 466875 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=-22.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,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 A7DD2C49EA5 for ; Thu, 24 Jun 2021 21:22:57 +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 3E84A6008E for ; Thu, 24 Jun 2021 21:22:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3E84A6008E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org 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 0563E828; Thu, 24 Jun 2021 23:22:04 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 0563E828 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1624569774; bh=MwO9BW7F8u85dyg2TGOKlZ7UI2TnjRUjqM503pSN/24=; h=From:To:Subject:Date:Cc:List-Id:List-Unsubscribe:List-Archive: List-Post:List-Help:List-Subscribe:From; b=pnQsE9ec2ywyqz4BzR5EGxe3trqWy+kE606FokldWeyCRX1EDMvsuUqw/L7+KYc0A ONukxc7946QDw/wDDLTYb2cTEr/QLmIdGoxdLcOtHllr1Wy+nprcZcetdyIorLGRe6 OR+7NoKN1qcbSaaLBHMlDQ/Rr/cqXSARF5RkpDaE= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 83070F801F7; Thu, 24 Jun 2021 23:22:03 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 6196DF8025F; Thu, 24 Jun 2021 23:22:01 +0200 (CEST) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 03256F80137 for ; Thu, 24 Jun 2021 23:21:58 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 03256F80137 Authentication-Results: alsa1.perex.cz; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="iLKW7DKE" Received: by mail.kernel.org (Postfix) with ESMTPSA id B9BE26124C; Thu, 24 Jun 2021 21:21:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1624569715; bh=MwO9BW7F8u85dyg2TGOKlZ7UI2TnjRUjqM503pSN/24=; h=From:To:Cc:Subject:Date:From; b=iLKW7DKEl64x9Qf5HTpK0uOhrMreIq66X1U0KB1JW5RidFei/4dBZDlUgPODgLyCv yuAu85JVo+Lj8EvJFKYegTScQaTVnNwDGYjP4V4k8Wj1lgRmQYyliDlU34iucl9TEw 4LhLZi0/lDh4JpKSX6k71QTt+s58rsNj623KCUfhuyvmDGc2auEMfk8DaiDAalEVav Hj3EjnhsmGiFkhhOmnVjgDH2NHtAJxLzaegeZNHuuxXEn1GF4itnXQAksVgnfePILf UiP4LmGXYALrcd6akuhhQWxbd9Fey9WX9f2w5TDC2c88z/1bJo4eDJ0rtGO1+Uas9M ac7xjlOKQ2oxg== From: Nathan Chancellor To: "Geoffrey D. Bennett" , Jaroslav Kysela , Takashi Iwai Subject: [PATCH] ALSA: usb-audio: scarlett2: Fix for loop increment in scarlett2_usb_get_config Date: Thu, 24 Jun 2021 14:20:48 -0700 Message-Id: <20210624212048.1356136-1-nathan@kernel.org> X-Mailer: git-send-email 2.32.0.93.g670b81a890 MIME-Version: 1.0 X-Patchwork-Bot: notify Cc: Nathan Chancellor , clang-built-linux@googlegroups.com, alsa-devel@alsa-project.org, Nick Desaulniers , linux-kernel@vger.kernel.org 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" Clang warns: sound/usb/mixer_scarlett_gen2.c:1189:32: warning: expression result unused [-Wunused-value] for (i = 0; i < count; i++, (u16 *)buf++) ^ ~~~~~ 1 warning generated. It appears the intention was to cast the void pointer to a u16 pointer so that the data could be iterated through like an array of u16 values. However, the cast happens after the increment because a cast is an rvalue, whereas the post-increment operator only works on lvalues, so the loop does not iterate as expected. Replace the post-increment shorthand with the full expression so the cast can be added in the right place and the look works as expected. Fixes: ac34df733d2d ("ALSA: usb-audio: scarlett2: Update get_config to do endian conversion") Link: https://github.com/ClangBuiltLinux/linux/issues/1408 Signed-off-by: Nathan Chancellor --- sound/usb/mixer_scarlett_gen2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) base-commit: 5c89c2c7fbfa9124dd521c375b9c82b9ed75bc28 diff --git a/sound/usb/mixer_scarlett_gen2.c b/sound/usb/mixer_scarlett_gen2.c index fcba682cd422..c20c7f1ddc50 100644 --- a/sound/usb/mixer_scarlett_gen2.c +++ b/sound/usb/mixer_scarlett_gen2.c @@ -1186,7 +1186,7 @@ static int scarlett2_usb_get_config( if (err < 0) return err; if (size == 2) - for (i = 0; i < count; i++, (u16 *)buf++) + for (i = 0; i < count; i++, buf = (u16 *)buf + 1) *(u16 *)buf = le16_to_cpu(*(__le16 *)buf); return 0; }