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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,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 CB932C2B9F8 for ; Tue, 25 May 2021 12:28:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE46B6117A for ; Tue, 25 May 2021 12:28:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232748AbhEYMaK (ORCPT ); Tue, 25 May 2021 08:30:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47906 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232666AbhEYM37 (ORCPT ); Tue, 25 May 2021 08:29:59 -0400 Received: from mail-qt1-x829.google.com (mail-qt1-x829.google.com [IPv6:2607:f8b0:4864:20::829]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ADE36C06138A; Tue, 25 May 2021 05:28:28 -0700 (PDT) Received: by mail-qt1-x829.google.com with SMTP id m13so22903432qtk.13; Tue, 25 May 2021 05:28:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=d0mlU653ZHAi1z8Z/h8nQvEb7mYuTzzrw09E6KPEru8=; b=fyiArXP91VEL8ckjAkRhHSYHjjGY6C0gPNcuombTNK9ml7ULwy++4eUIFqUGUsxA+w 6ZHZk08DOFKd/t6YTd0/bGafXHiU1FX0QTzA5q2ndfDvjR8iUvAdI8reRVfqbr0H1+9t P1ydpSC4dmpcGrvdMofV9zuIqkV0CMtWWy8zU9lo6dQVtGeEHuy+nfdr61fQkaRMyBrJ MJ0sa599vZ+95biDh3PK9Z3rFu0nER6zGR1DCtyhoJuMak2616XI/6MX0CshrqNL73UJ lZ28BUVDbSjOsQbf7Lk9azR/rsPH1hGmJi37fzYUzUveINS9HLuurwqUMVt7CPurLJM9 0DzA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=d0mlU653ZHAi1z8Z/h8nQvEb7mYuTzzrw09E6KPEru8=; b=OZGVfRDLWxKOZsUoVZr+cgJDrKeA55RT1rSg8BFzYy3RpgLGUFC+tIcyzxHdyhA/0x TFv8/To1RJFWw0JOeeB1xSGb3Gt5gz7p5mDkiBS7aPTIs3pcaJeoK4JyJmVcQ4ECAtC6 5oK+yW4Z9PRiHg2l7qDQBZMwmLCOBRbf5aZ2aeJrMJ2ocRJCw/ag7K9p6ecQw7Ek1ttX ZOVKROy88hA8tKakyuiWGzEIGLsoBfQfaEJgVo5gC5jdLzGZBylxbQwri3jwP4sErSdp 0qRYKC9c6UkaDmvWgGmkYdsUjEozVPX+uXTO5XnVa5zer4Iac0nDW0g7TDRRNpkjBQtN ysrA== X-Gm-Message-State: AOAM532iWRNLnCD6f53ybvOWjyk7RqWSZFty6E5th3aXWRZkkqLC+BRU kDaZvu+88k5h9stlxE4N4PY= X-Google-Smtp-Source: ABdhPJyxlIyl+45knbJvhcZRWn56oB8CpilV0x5SeAF0UzKsqwHEimxjda46mb9z+TE3eP0YMu/QfA== X-Received: by 2002:ac8:604:: with SMTP id d4mr30870306qth.304.1621945707833; Tue, 25 May 2021 05:28:27 -0700 (PDT) Received: from master-laptop.sparksnet ([2601:153:980:85b1:a465:c799:7794:b233]) by smtp.gmail.com with ESMTPSA id t6sm13292572qkh.117.2021.05.25.05.28.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 May 2021 05:28:27 -0700 (PDT) From: Peter Geis To: Andrew Lunn , Heiner Kallweit , Russell King , "David S . Miller" , Jakub Kicinski , Nathan Chancellor Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Peter Geis , kernel test robot Subject: [PATCH 2/2] net: phy: abort loading yt8511 driver in unsupported modes Date: Tue, 25 May 2021 08:26:15 -0400 Message-Id: <20210525122615.3972574-3-pgwipeout@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210525122615.3972574-1-pgwipeout@gmail.com> References: <20210525122615.3972574-1-pgwipeout@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org While investigating the clang `ge` uninitialized variable report, it was discovered the default switch would have unintended consequences. Due to the switch to __phy_modify, the driver would modify the ID values in the default scenario. Fix this by promoting the interface mode switch and aborting when the mode is not a supported RGMII mode. This prevents the `ge` and `fe` variables from ever being used uninitialized. Fixes: b1b41c047f73 ("net: phy: add driver for Motorcomm yt8511 phy") Reported-by: kernel test robot Signed-off-by: Peter Geis --- drivers/net/phy/motorcomm.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/net/phy/motorcomm.c b/drivers/net/phy/motorcomm.c index 5795f446c528..53178e978da7 100644 --- a/drivers/net/phy/motorcomm.c +++ b/drivers/net/phy/motorcomm.c @@ -53,15 +53,10 @@ static int yt8511_config_init(struct phy_device *phydev) unsigned int ge, fe; int oldpage, ret = 0; - /* set clock mode to 125mhz */ oldpage = phy_select_page(phydev, YT8511_EXT_CLK_GATE); if (oldpage < 0) goto err_restore_page; - ret = __phy_modify(phydev, YT8511_PAGE, 0, YT8511_CLK_125M); - if (ret < 0) - goto err_restore_page; - /* set rgmii delay mode */ switch (phydev->interface) { case PHY_INTERFACE_MODE_RGMII: @@ -80,14 +75,20 @@ static int yt8511_config_init(struct phy_device *phydev) ge = YT8511_DELAY_RX | YT8511_DELAY_GE_TX_EN; fe = YT8511_DELAY_FE_TX_EN; break; - default: /* leave everything alone in other modes */ - break; + default: /* do not support other modes */ + ret = -EOPNOTSUPP; + goto err_restore_page; } ret = __phy_modify(phydev, YT8511_PAGE, (YT8511_DELAY_RX | YT8511_DELAY_GE_TX_EN), ge); if (ret < 0) goto err_restore_page; + /* set clock mode to 125mhz */ + ret = __phy_modify(phydev, YT8511_PAGE, 0, YT8511_CLK_125M); + if (ret < 0) + goto err_restore_page; + /* fast ethernet delay is in a separate page */ ret = __phy_write(phydev, YT8511_PAGE_SELECT, YT8511_EXT_DELAY_DRIVE); if (ret < 0) -- 2.25.1