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[23.128.96.18]) by mx.google.com with ESMTP id o27si7170439pgm.555.2021.05.07.10.32.20; Fri, 07 May 2021 10:32:32 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=GWEq3bdF; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237975AbhEGPiP (ORCPT + 99 others); Fri, 7 May 2021 11:38:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43476 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231297AbhEGPiN (ORCPT ); Fri, 7 May 2021 11:38:13 -0400 Received: from mail-pf1-x435.google.com (mail-pf1-x435.google.com [IPv6:2607:f8b0:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 10D10C061574; Fri, 7 May 2021 08:37:13 -0700 (PDT) Received: by mail-pf1-x435.google.com with SMTP id b21so780108pft.10; Fri, 07 May 2021 08:37:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=arEMVevpyfNHH/qKMg3yLIl1/YDAxyNNmu5V8KzMUSk=; b=GWEq3bdFqNNhtl5fHbSPpJ7yFRro9yFokHjw4eJm4xLLJazOMoKDaraWO1ULYGc0m7 GjM80DiZd0zibt2JnV9oOudaFUhpl/Qs1vbzyzShMcBBn9N+AjzT4Yr+PmpmhaM4kwvF UHlPujwPbbQhCMHspQlGKDKAna0MuFJ4Zgqo7gaOxdo02ulwh02ojHGoeQqZBAb9rtUc q0sFvqD8Gn40aegbJJKFgliebJPJg0n6w8SRV6+B8bFN9Row/4f5uLhCKGy3aGg4OpmA wo59/4o1iPvfDpx6Q0POE9t56dGdgB4LDSW9xkknfPBEBha3CKrpADZW9SL087XOwrE8 f/0w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=arEMVevpyfNHH/qKMg3yLIl1/YDAxyNNmu5V8KzMUSk=; b=D3MVHkkH6hf6Ls4NVgmfHgNKgVz2IGHnjTv7FG/bicmTWuQTIQjiuAYm0GkMSwBoMG 6Us66x8BbdCMevJsiK851Tx6IhpoMtrwFkzu7Boaz6pPef2h3esrrPIQypEu0Qtgwx8w SSbqRywl1/kOctXz+Vb05HuFOC3hDqKyS9Wy1xbtS+JUUvWvRMm1AhXEombp7ltiQOQe FPNe+2w0DNnvaFnb9u4G6XWOPjZbLM+RfcwkSy6RLbhSgH/xMU+zrPlFPnKne3BrbO3P zZoVkGZeAdI6zHkfh/IyZku40ITnBmEdxJG7ohDuultlmyBGtEQBY8nLp7vOoffEn8ex WwiA== X-Gm-Message-State: AOAM531Op7XgJDE0oEYgufajln2ex4n7Gumybh1p01Hd6SzuFRGeZflS RXlwbzsT8KKB0ZrcjdwWR90oDBok+goWVXcsU7l8dfve4kCEug== X-Received: by 2002:a62:e50f:0:b029:214:8e4a:ae46 with SMTP id n15-20020a62e50f0000b02902148e4aae46mr10872897pff.73.1620401832435; Fri, 07 May 2021 08:37:12 -0700 (PDT) MIME-Version: 1.0 References: <20210507004047.4454-1-chris.packham@alliedtelesis.co.nz> <20210507004047.4454-4-chris.packham@alliedtelesis.co.nz> In-Reply-To: From: Andy Shevchenko Date: Fri, 7 May 2021 18:36:56 +0300 Message-ID: Subject: Re: [PATCH v2 3/3] i2c: mpc: implement erratum A-004447 workaround To: Joakim Tjernlund Cc: "chris.packham@alliedtelesis.co.nz" , "linuxppc-dev@lists.ozlabs.org" , "linux-i2c@vger.kernel.org" , "andriy.shevchenko@linux.intel.com" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "wsa@kernel.org" , "robh+dt@kernel.org" Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, May 7, 2021 at 5:52 PM Joakim Tjernlund wrote: > On Fri, 2021-05-07 at 14:46 +0300, Andy Shevchenko wrote: > > On Fri, May 7, 2021 at 3:40 AM Chris Packham > > wrote: ... > > So, now you may shrink it even further, i.e. > > > > void __iomem *sr = i2c->base + MPC_I2C_SR; > > u8 val; > > > > return readb_poll_timeout(sr, val, val & mask, 0, 100); > > > > val looks uninitialised before use? Nope. Thinking about naming, perhaps void __iomem *addr = i2c->base + MPC_I2C_SR; u8 sr; // or leave as val? return readb_poll_timeout(addr, sr, sr & mask, 0, 100); would be more clear. -- With Best Regards, Andy Shevchenko