Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751601AbdLFLTo (ORCPT ); Wed, 6 Dec 2017 06:19:44 -0500 Received: from 178.115.242.59.static.drei.at ([178.115.242.59]:53849 "EHLO mail.osadl.at" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751208AbdLFLTl (ORCPT ); Wed, 6 Dec 2017 06:19:41 -0500 X-Greylist: delayed 351 seconds by postgrey-1.27 at vger.kernel.org; Wed, 06 Dec 2017 06:19:40 EST From: Andreas Platschek To: vinod.koul@intel.com Cc: dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, dan.j.williams@intel.com, Andreas Platschek Subject: [PATCH] dmaengine: fsl-edma: disable clks on all error paths Date: Wed, 6 Dec 2017 12:13:33 +0100 Message-Id: <1512558813-25279-1-git-send-email-andreas.platschek@opentech.at> X-Mailer: git-send-email 2.1.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1410 Lines: 42 Previously enabled clks are only disabled if clk_prepare_enable() fails. However, there are other error paths were the previously enabled clocks are not disabled. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Andreas Platschek --- drivers/dma/fsl-edma.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c index 6775f2c74e25..ccb447253cd2 100644 --- a/drivers/dma/fsl-edma.c +++ b/drivers/dma/fsl-edma.c @@ -904,12 +904,23 @@ static int fsl_edma_probe(struct platform_device *pdev) res = platform_get_resource(pdev, IORESOURCE_MEM, 1 + i); fsl_edma->muxbase[i] = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(fsl_edma->muxbase[i])) + if (IS_ERR(fsl_edma->muxbase[i])) { + /* disable only clks which were enabled on error */ + i--; + for (; i >= 0; i--) + clk_disable_unprepare(fsl_edma->muxclk[i]); + return PTR_ERR(fsl_edma->muxbase[i]); + } sprintf(clkname, "dmamux%d", i); fsl_edma->muxclk[i] = devm_clk_get(&pdev->dev, clkname); if (IS_ERR(fsl_edma->muxclk[i])) { + /* disable only clks which were enabled on error */ + i--; + for (; i >= 0; i--) + clk_disable_unprepare(fsl_edma->muxclk[i]); + dev_err(&pdev->dev, "Missing DMAMUX block clock.\n"); return PTR_ERR(fsl_edma->muxclk[i]); } -- 2.11.0