Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752205AbdHHLvX (ORCPT ); Tue, 8 Aug 2017 07:51:23 -0400 Received: from mail-pg0-f65.google.com ([74.125.83.65]:36537 "EHLO mail-pg0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752039AbdHHLvV (ORCPT ); Tue, 8 Aug 2017 07:51:21 -0400 From: Arvind Yadav To: lee.jones@linaro.org, kgene@kernel.org, krzk@kernel.org Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org Subject: [PATCH] mfd: exynos-lpass: Handle return value of clk_prepare_enable Date: Tue, 8 Aug 2017 17:20:55 +0530 Message-Id: <0e52a230fce95714a12b72aeb1ee9be0490de2a6.1502192959.git.arvind.yadav.cs@gmail.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2259 Lines: 74 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 --- drivers/mfd/exynos-lpass.c | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-) diff --git a/drivers/mfd/exynos-lpass.c b/drivers/mfd/exynos-lpass.c index ca829f8..c74ff62 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) @@ -136,8 +143,12 @@ 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); + return ret; + } return devm_of_platform_populate(dev); } @@ -167,9 +178,7 @@ 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