Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751770AbdHJGBs (ORCPT ); Thu, 10 Aug 2017 02:01:48 -0400 Received: from mail-yw0-f194.google.com ([209.85.161.194]:37852 "EHLO mail-yw0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750868AbdHJGBq (ORCPT ); Thu, 10 Aug 2017 02:01:46 -0400 Date: Thu, 10 Aug 2017 08:01:40 +0200 From: Krzysztof Kozlowski To: Arvind Yadav Cc: lee.jones@linaro.org, kgene@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, Sylwester Nawrocki , Marek Szyprowski , Chanwoo Choi , Bartlomiej Zolnierkiewicz , Andi Shyti Subject: Re: [RFT v2] mfd: exynos-lpass: Handle return value of clk_prepare_enable Message-ID: <20170810060140.GA3625@kozik-book> References: <8de486cf36afdf97792313a6b21432e04374e47e.1502253715.git.arvind.yadav.cs@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <8de486cf36afdf97792313a6b21432e04374e47e.1502253715.git.arvind.yadav.cs@gmail.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2810 Lines: 87 On Wed, Aug 09, 2017 at 10:18:10AM +0530, Arvind Yadav wrote: > clk_prepare_enable() can fail here and we must check its return value. > we must call pm_runtime_disable() and pm_runtime_set_suspended(), > If exynos_lpass_probe is not successful. > > Signed-off-by: Arvind Yadav > --- > changes in v2: > added regmap_exit(lpass->top) and blank line before return. > > drivers/mfd/exynos-lpass.c | 23 +++++++++++++++++------ > 1 file changed, 17 insertions(+), 6 deletions(-) > For me looks ok although this requires testing and I do not have Exynos with LPASS (e.g. Exynos5433). Maybe folks from Samsung (Polish R&D or HQ as they are working on it) could help (Cced). Best regards, Krzysztof > diff --git a/drivers/mfd/exynos-lpass.c b/drivers/mfd/exynos-lpass.c > index ca829f8..1ab7210 100644 > --- a/drivers/mfd/exynos-lpass.c > +++ b/drivers/mfd/exynos-lpass.c > @@ -73,9 +73,13 @@ static void exynos_lpass_core_sw_reset(struct exynos_lpass *lpass, int mask) > regmap_write(lpass->top, SFR_LPASS_CORE_SW_RESET, val); > } > > -static void exynos_lpass_enable(struct exynos_lpass *lpass) > +static int exynos_lpass_enable(struct exynos_lpass *lpass) > { > - clk_prepare_enable(lpass->sfr0_clk); > + int ret; > + > + ret = clk_prepare_enable(lpass->sfr0_clk); > + if (ret) > + return ret; > > /* Unmask SFR, DMA and I2S interrupt */ > regmap_write(lpass->top, SFR_LPASS_INTR_CA5_MASK, > @@ -87,6 +91,8 @@ static void exynos_lpass_enable(struct exynos_lpass *lpass) > exynos_lpass_core_sw_reset(lpass, LPASS_I2S_SW_RESET); > exynos_lpass_core_sw_reset(lpass, LPASS_DMA_SW_RESET); > exynos_lpass_core_sw_reset(lpass, LPASS_MEM_SW_RESET); > + > + return 0; > } > > static void exynos_lpass_disable(struct exynos_lpass *lpass) > @@ -112,6 +118,7 @@ static int exynos_lpass_probe(struct platform_device *pdev) > struct exynos_lpass *lpass; > void __iomem *base_top; > struct resource *res; > + int ret; > > lpass = devm_kzalloc(dev, sizeof(*lpass), GFP_KERNEL); > if (!lpass) > @@ -136,7 +143,13 @@ static int exynos_lpass_probe(struct platform_device *pdev) > platform_set_drvdata(pdev, lpass); > pm_runtime_set_active(dev); > pm_runtime_enable(dev); > - exynos_lpass_enable(lpass); > + ret = exynos_lpass_enable(lpass); > + if (ret) { > + pm_runtime_disable(dev); > + pm_runtime_set_suspended(dev); > + regmap_exit(lpass->top); > + return ret; > + } > > return devm_of_platform_populate(dev); > } > @@ -167,9 +180,7 @@ static int __maybe_unused exynos_lpass_resume(struct device *dev) > { > struct exynos_lpass *lpass = dev_get_drvdata(dev); > > - exynos_lpass_enable(lpass); > - > - return 0; > + return exynos_lpass_enable(lpass); > } > > static const struct dev_pm_ops lpass_pm_ops = { > -- > 1.9.1 >