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Thu, 15 Apr 2021 01:23:10 +0000 Date: Thu, 15 Apr 2021 09:21:58 +0800 From: wqyoung To: Dinghao Liu Cc: kjlu@umn.edu, Mark Brown , Michal Simek , linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] [v2] spi: spi-zynqmp-gqspi: Fix runtime PM imbalance in zynqmp_qspi_probe Message-ID: <20210415012158.GA2465158@pek-qwang2-d1> References: <20210412073154.25011-1-dinghao.liu@zju.edu.cn> Content-Disposition: inline In-Reply-To: <20210412073154.25011-1-dinghao.liu@zju.edu.cn> X-Originating-IP: [60.247.85.82] X-ClientProxiedBy: HK0PR03CA0097.apcprd03.prod.outlook.com (2603:1096:203:b0::13) To CY4PR11MB0071.namprd11.prod.outlook.com (2603:10b6:910:7a::30) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from pek-qwang2-d1 (60.247.85.82) by HK0PR03CA0097.apcprd03.prod.outlook.com (2603:1096:203:b0::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4042.16 via Frontend Transport; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Dinghao, On Mon, Apr 12, 2021 at 03:31:54PM +0800, Dinghao Liu wrote: > There is a PM usage counter decrement after zynqmp_qspi_init_hw() > without any refcount increment, which leads to refcount leak.Add > a refcount increment to balance the refcount. Also set > auto_runtime_pm to resume suspended spi controller. > > Signed-off-by: Dinghao Liu > --- > changelog: > > v2: - Add a refcount increment to fix refcout leak instead of the > refcount decrement on error. > Set ctlr->auto_runtime_pm = true. > --- > drivers/spi/spi-zynqmp-gqspi.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c > index c8fa6ee18ae7..8b21c7b0e7eb 100644 > --- a/drivers/spi/spi-zynqmp-gqspi.c > +++ b/drivers/spi/spi-zynqmp-gqspi.c > @@ -1160,6 +1160,7 @@ static int zynqmp_qspi_probe(struct platform_device *pdev) > pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT); > pm_runtime_set_active(&pdev->dev); > pm_runtime_enable(&pdev->dev); > + pm_runtime_get_sync(&pdev->dev); Please check the return value here, if ret is "< 0", goto error label, and a pm_runtime_put_sync is needed in error label > /* QSPI controller initializations */ > zynqmp_qspi_init_hw(xqspi); > > @@ -1187,6 +1188,7 @@ static int zynqmp_qspi_probe(struct platform_device *pdev) > ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD | > SPI_TX_DUAL | SPI_TX_QUAD; > ctlr->dev.of_node = np; > + ctlr->auto_runtime_pm = true; > > ret = devm_spi_register_controller(&pdev->dev, ctlr); > if (ret) { These 2 function pm_runtime_mark_last_busy(&pdev->dev); pm_runtime_put_autosuspend(&pdev->dev); are the last operations in probe function since if they runs, spi_controller will enter suspend state and disable clks after 3s passing. So please move them just before "return 0". And would you please cc me when you send V3? I am preparing to send a patch series to fix clk and suspend/resume issues which bases on the pm_runtime issue. Thanks, Quanyang > -- > 2.17.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel