From patchwork Thu May 5 15:27:38 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nathan Chancellor X-Patchwork-Id: 570053 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 CBF95C433F5 for ; Thu, 5 May 2022 15:27:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355427AbiEEPbb (ORCPT ); Thu, 5 May 2022 11:31:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55970 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234496AbiEEPba (ORCPT ); Thu, 5 May 2022 11:31:30 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C039B50B1E; Thu, 5 May 2022 08:27:50 -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 5A68761D0F; Thu, 5 May 2022 15:27:50 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id EBE8EC385A8; Thu, 5 May 2022 15:27:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1651764469; bh=mVIRt4yoiSxRUkECE7FwEEKVUQMrty6/i5Bfy9avcZw=; h=From:To:Cc:Subject:Date:From; b=IqTfK1DOBA9q7un4+7ST/1fhCQ5C0Fsqk1K9f4pSfp36DSjneyNQDm9bDfyD0H8rs UMIOn/Bl9GUzZ4Ust3lh4XKsbaCwlPB8CKP+d+Gi7p/hUMyVNucjoV/WIUnRULQlMA 9m2Pv2LlbxiruPNjFUNKcuN+MyYSaqnLbqBoczTRDgTmFCkiWusCOek8yWtPRuEjE8 w4zruAgWJAoq9nWgvDdXMZqpi3givElrdGT4+BwtSzalG8poEXzELnuSpqs8/+Z6gh g6uE6D5pHuqLH+Z5v329/qucwK4zPczzpRGh1ETfAhDJqrwssKDjFgFXcomwbzAd/z mqVzUvHmWKO8A== From: Nathan Chancellor To: Codrin Ciubotariu , Nicolas Ferre , Alexandre Belloni , Claudiu Beznea , Wolfram Sang , Michael Walle Cc: Nick Desaulniers , Tom Rix , linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Nathan Chancellor Subject: [PATCH] i2c: at91: Initialize dma_buf in at91_twi_xfer() Date: Thu, 5 May 2022 08:27:38 -0700 Message-Id: <20220505152738.1440249-1-nathan@kernel.org> X-Mailer: git-send-email 2.36.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org 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 --- drivers/i2c/busses/i2c-at91-master.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) base-commit: a181b8d187319bf265a2019ddde856a3d2f107a6 diff --git a/drivers/i2c/busses/i2c-at91-master.c b/drivers/i2c/busses/i2c-at91-master.c index 5eca3b3bb609..c0c35785a0dc 100644 --- a/drivers/i2c/busses/i2c-at91-master.c +++ b/drivers/i2c/busses/i2c-at91-master.c @@ -656,7 +656,7 @@ 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);