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=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,T_DKIMWL_WL_HIGH,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 028D8C43219 for ; Thu, 2 May 2019 15:36:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B87E32081C for ; Thu, 2 May 2019 15:36:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556811418; bh=XOoIZXUcB+RNeucMSb7LWkOxPRIBwr4WRUQ5danWtXU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=UY+Qg8m8/4bI7nfpV5de3kECp+t5mFcUQqbsTP7AktRX+wgNzRz0VD3kiAdWqGsqM laRxugtOfG0a/BzRYH4/e2dPGb5iJbPJ1V2RBMjAEuD/6duHeKIPm60LTrKrzvLMoH cyy09S18mn6RThvBBVKhgvcF5sVK2HTbJNpIN5sg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727909AbfEBPgv (ORCPT ); Thu, 2 May 2019 11:36:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:49360 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727496AbfEBPal (ORCPT ); Thu, 2 May 2019 11:30:41 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 261D52081C; Thu, 2 May 2019 15:30:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556811040; bh=XOoIZXUcB+RNeucMSb7LWkOxPRIBwr4WRUQ5danWtXU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CHeKYdJvmSkO+mZRlJIfTkBCFpqA0pSbbs6n9B4p7n4DM3VaG/s2G59DFMDR36BQ6 RjarvneJxrZ8uAWOQ2POAj+ZvICztsuqCt3cBSAgYgWzavf1QMZEFNpYr19hFovKYF 92bdjROjsX356aR274riD406fvfxR7cyfH9I85Fo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Harini Katakam , "David S. Miller" , "Sasha Levin (Microsoft)" Subject: [PATCH 5.0 051/101] net: macb: Add null check for PCLK and HCLK Date: Thu, 2 May 2019 17:20:53 +0200 Message-Id: <20190502143343.099947781@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190502143339.434882399@linuxfoundation.org> References: <20190502143339.434882399@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit cd5afa91f078c0787be0a62b5ef90301c00b0271 ] Both PCLK and HCLK are "required" clocks according to macb devicetree documentation. There is a chance that devm_clk_get doesn't return a negative error but just a NULL clock structure instead. In such a case the driver proceeds as usual and uses pclk value 0 to calculate MDC divisor which is incorrect. Hence fix the same in clock initialization. Signed-off-by: Harini Katakam Signed-off-by: David S. Miller Signed-off-by: Sasha Levin (Microsoft) --- drivers/net/ethernet/cadence/macb_main.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c index 2b2882615e8b..6cbe515bfdeb 100644 --- a/drivers/net/ethernet/cadence/macb_main.c +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -3318,14 +3318,20 @@ static int macb_clk_init(struct platform_device *pdev, struct clk **pclk, *hclk = devm_clk_get(&pdev->dev, "hclk"); } - if (IS_ERR(*pclk)) { + if (IS_ERR_OR_NULL(*pclk)) { err = PTR_ERR(*pclk); + if (!err) + err = -ENODEV; + dev_err(&pdev->dev, "failed to get macb_clk (%u)\n", err); return err; } - if (IS_ERR(*hclk)) { + if (IS_ERR_OR_NULL(*hclk)) { err = PTR_ERR(*hclk); + if (!err) + err = -ENODEV; + dev_err(&pdev->dev, "failed to get hclk (%u)\n", err); return err; } -- 2.19.1