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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 71CA6CCA47B for ; Mon, 13 Jun 2022 12:00:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1357343AbiFMMAX (ORCPT ); Mon, 13 Jun 2022 08:00:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49408 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358232AbiFML7r (ORCPT ); Mon, 13 Jun 2022 07:59:47 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C7B674EA3C; Mon, 13 Jun 2022 03:56:37 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 5CD4461257; Mon, 13 Jun 2022 10:56:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6831EC3411E; Mon, 13 Jun 2022 10:56:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1655117796; bh=gzEyKK8I6JOnFN7klCEewGiQRBGvaWNSnax61KWE0pQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uV/3dWsbxX3FflrFu21xLE/47JwdYUs4xuS889Zo/06P+N8lTykyELRfBmhKA7gGl jOGb/XhZqhQAVeSEoz28D798ORAIZ/nqB+5DwVF0Pdyo5CJRoqbAB/Ep9gQsSxK/ew DciUQ2/VqlpamY5dP3z1a6IZmfXWfcWEpcaFpWC0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nathan Chancellor , Michael Walle , Wolfram Sang , Sasha Levin Subject: [PATCH 4.19 135/287] i2c: at91: Initialize dma_buf in at91_twi_xfer() Date: Mon, 13 Jun 2022 12:09:19 +0200 Message-Id: <20220613094927.973227816@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220613094923.832156175@linuxfoundation.org> References: <20220613094923.832156175@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: stable@vger.kernel.org From: Nathan Chancellor [ Upstream commit 6977262c2eee111645668fe9e235ef2f5694abf7 ] Clang warns: drivers/i2c/busses/i2c-at91-master.c:707:6: warning: variable 'dma_buf' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] if (dev->use_dma) { ^~~~~~~~~~~~ drivers/i2c/busses/i2c-at91-master.c:717:27: note: uninitialized use occurs here i2c_put_dma_safe_msg_buf(dma_buf, m_start, !ret); ^~~~~~~ Initialize dma_buf to NULL, as i2c_put_dma_safe_msg_buf() is a no-op when the first argument is NULL, which will work for the !dev->use_dma case. Fixes: 03fbb903c8bf ("i2c: at91: use dma safe buffers") Link: https://github.com/ClangBuiltLinux/linux/issues/1629 Signed-off-by: Nathan Chancellor Reviewed-by: Michael Walle Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- drivers/i2c/busses/i2c-at91.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c index d5119a2adf5d..29947eb905fb 100644 --- a/drivers/i2c/busses/i2c-at91.c +++ b/drivers/i2c/busses/i2c-at91.c @@ -757,7 +757,7 @@ static int at91_twi_xfer(struct i2c_adapter *adap, struct i2c_msg *msg, int num) unsigned int_addr_flag = 0; struct i2c_msg *m_start = msg; bool is_read; - u8 *dma_buf; + u8 *dma_buf = NULL; dev_dbg(&adap->dev, "at91_xfer: processing %d messages:\n", num); -- 2.35.1