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Mon, 1 Jun 2026 09:19:38 +0000 Message-ID: <05400788-da59-4ef8-9c2b-4efff298be2a@intel.com> Date: Mon, 1 Jun 2026 12:19:34 +0300 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] mmc: sdhci-of-dwcmshc: check bus clock enable result in the, probe() method To: Sergey Shtylyov , Ulf Hansson , CC: Jisheng Zhang References: Content-Language: en-US From: Adrian Hunter Organization: Intel Finland Oy, Registered Address: c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo, Business Identity Code: 0357606 - 4, Domiciled in Helsinki In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: DUZPR01CA0074.eurprd01.prod.exchangelabs.com (2603:10a6:10:3c2::20) To IA1PR11MB7198.namprd11.prod.outlook.com (2603:10b6:208:419::15) Precedence: bulk X-Mailing-List: linux-mmc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA1PR11MB7198:EE_|MW4PR11MB6764:EE_ X-MS-Office365-Filtering-Correlation-Id: 179f626e-0217-4fe1-6fd0-08debfbee76d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024|18002099003|22082099003|56012099006|11063799006; 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Also, the same problem > can happen in the driver's suspend() method; note that the resume() method > does check the clk_prepare_enable()'s result -- let's be consistent and do > that in probe() method as well. BTW, I don't know for sure what does the > bus clock control -- if it affects the register accesses, the driver will > likely to cause (e.g. on ARM) a kernel oops if it fails to prepare/enable > the bus clock in the probe() method... > > Found by Linux Verification Center (linuxtesting.org) with the Svace static > analysis tool. > > Fixes: e438cf49b305 ("mmc: sdhci-of-dwcmshc: add SDHCI OF Synopsys DWC MSHC driver") > Fixes: bccce2ec7790 ("mmc: sdhci-of-dwcmshc: add suspend/resume support") > Signed-off-by: Sergey Shtylyov Acked-by: Adrian Hunter > > --- > This patch is against the fixes branch of Ulf Hansson's mmc.git repo. > > Changes in version 2: > - mentioned the problem in the remove() method as well, somewhat rephrased > the patch description. > > drivers/mmc/host/sdhci-of-dwcmshc.c | 14 +++++++++----- > 1 file changed, 9 insertions(+), 5 deletions(-) > > diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c > index b9ecd91f44ad..29af07561a86 100644 > --- a/drivers/mmc/host/sdhci-of-dwcmshc.c > +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c > @@ -2441,13 +2441,16 @@ static int dwcmshc_probe(struct platform_device *pdev) > return err; > > priv->bus_clk = devm_clk_get(dev, "bus"); > - if (!IS_ERR(priv->bus_clk)) > - clk_prepare_enable(priv->bus_clk); > + if (!IS_ERR(priv->bus_clk)) { > + err = clk_prepare_enable(priv->bus_clk); > + if (err) > + goto err_clk; > + } > } > > err = mmc_of_parse(host->mmc); > if (err) > - goto err_clk; > + goto err_bus_clk; > > sdhci_get_of_property(pdev); > > @@ -2461,7 +2464,7 @@ static int dwcmshc_probe(struct platform_device *pdev) > if (pltfm_data->init) { > err = pltfm_data->init(&pdev->dev, host, priv); > if (err) > - goto err_clk; > + goto err_bus_clk; > } > > #ifdef CONFIG_ACPI > @@ -2507,9 +2510,10 @@ static int dwcmshc_probe(struct platform_device *pdev) > err_rpm: > pm_runtime_disable(dev); > pm_runtime_put_noidle(dev); > +err_bus_clk: > + clk_disable_unprepare(priv->bus_clk); > err_clk: > clk_disable_unprepare(pltfm_host->clk); > - clk_disable_unprepare(priv->bus_clk); > clk_bulk_disable_unprepare(priv->num_other_clks, priv->other_clks); > return err; > }