From: Dinghao Liu <dinghao.liu@zju.edu.cn> To: dinghao.liu@zju.edu.cn, kjlu@umn.edu Cc: Vinod Koul <vkoul@kernel.org>, Dan Williams <dan.j.williams@intel.com>, Maxime Coquelin <mcoquelin.stm32@gmail.com>, Alexandre Torgue <alexandre.torgue@st.com>, dmaengine@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] dmaengine: stm32-dmamux: Fix runtime PM imbalance on error Date: Sun, 24 May 2020 14:02:23 +0800 [thread overview] Message-ID: <20200524060224.16189-1-dinghao.liu@zju.edu.cn> (raw) In stm32_dmamux_route_allocate(), pm_runtime_get_sync() increments the runtime PM usage counter even when it returns an error code. Thus a pairing decrement is needed on the error handling path to keep the counter balanced. In stm32_dmamux_probe(), when platform_get_resource() returns an error code, a pairing runtime PM usage counter decrement is needed to keep the counter balanced. For error paths after this call, things are the same. Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn> --- drivers/dma/stm32-dmamux.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c index 12f7637e13a1..e68e7078ff94 100644 --- a/drivers/dma/stm32-dmamux.c +++ b/drivers/dma/stm32-dmamux.c @@ -139,6 +139,7 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec, spin_lock_irqsave(&dmamux->lock, flags); ret = pm_runtime_get_sync(&pdev->dev); if (ret < 0) { + pm_runtime_put_noidle(&pdev->dev); spin_unlock_irqrestore(&dmamux->lock, flags); goto error; } @@ -246,8 +247,10 @@ static int stm32_dmamux_probe(struct platform_device *pdev) res = platform_get_resource(pdev, IORESOURCE_MEM, 0); iomem = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(iomem)) + if (IS_ERR(iomem)) { + pm_runtime_put_noidle(&pdev->dev); return PTR_ERR(iomem); + } spin_lock_init(&stm32_dmamux->lock); @@ -256,12 +259,14 @@ static int stm32_dmamux_probe(struct platform_device *pdev) ret = PTR_ERR(stm32_dmamux->clk); if (ret != -EPROBE_DEFER) dev_err(&pdev->dev, "Missing clock controller\n"); + pm_runtime_put_noidle(&pdev->dev); return ret; } ret = clk_prepare_enable(stm32_dmamux->clk); if (ret < 0) { dev_err(&pdev->dev, "clk_prep_enable error: %d\n", ret); + pm_runtime_put_noidle(&pdev->dev); return ret; } @@ -300,6 +305,7 @@ static int stm32_dmamux_probe(struct platform_device *pdev) return 0; err_clk: + pm_runtime_put_noidle(&pdev->dev); clk_disable_unprepare(stm32_dmamux->clk); return ret; -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Dinghao Liu <dinghao.liu@zju.edu.cn> To: dinghao.liu@zju.edu.cn, kjlu@umn.edu Cc: Alexandre Torgue <alexandre.torgue@st.com>, linux-kernel@vger.kernel.org, Vinod Koul <vkoul@kernel.org>, Maxime Coquelin <mcoquelin.stm32@gmail.com>, dmaengine@vger.kernel.org, Dan Williams <dan.j.williams@intel.com>, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Subject: [PATCH] dmaengine: stm32-dmamux: Fix runtime PM imbalance on error Date: Sun, 24 May 2020 14:02:23 +0800 [thread overview] Message-ID: <20200524060224.16189-1-dinghao.liu@zju.edu.cn> (raw) In stm32_dmamux_route_allocate(), pm_runtime_get_sync() increments the runtime PM usage counter even when it returns an error code. Thus a pairing decrement is needed on the error handling path to keep the counter balanced. In stm32_dmamux_probe(), when platform_get_resource() returns an error code, a pairing runtime PM usage counter decrement is needed to keep the counter balanced. For error paths after this call, things are the same. Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn> --- drivers/dma/stm32-dmamux.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c index 12f7637e13a1..e68e7078ff94 100644 --- a/drivers/dma/stm32-dmamux.c +++ b/drivers/dma/stm32-dmamux.c @@ -139,6 +139,7 @@ static void *stm32_dmamux_route_allocate(struct of_phandle_args *dma_spec, spin_lock_irqsave(&dmamux->lock, flags); ret = pm_runtime_get_sync(&pdev->dev); if (ret < 0) { + pm_runtime_put_noidle(&pdev->dev); spin_unlock_irqrestore(&dmamux->lock, flags); goto error; } @@ -246,8 +247,10 @@ static int stm32_dmamux_probe(struct platform_device *pdev) res = platform_get_resource(pdev, IORESOURCE_MEM, 0); iomem = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(iomem)) + if (IS_ERR(iomem)) { + pm_runtime_put_noidle(&pdev->dev); return PTR_ERR(iomem); + } spin_lock_init(&stm32_dmamux->lock); @@ -256,12 +259,14 @@ static int stm32_dmamux_probe(struct platform_device *pdev) ret = PTR_ERR(stm32_dmamux->clk); if (ret != -EPROBE_DEFER) dev_err(&pdev->dev, "Missing clock controller\n"); + pm_runtime_put_noidle(&pdev->dev); return ret; } ret = clk_prepare_enable(stm32_dmamux->clk); if (ret < 0) { dev_err(&pdev->dev, "clk_prep_enable error: %d\n", ret); + pm_runtime_put_noidle(&pdev->dev); return ret; } @@ -300,6 +305,7 @@ static int stm32_dmamux_probe(struct platform_device *pdev) return 0; err_clk: + pm_runtime_put_noidle(&pdev->dev); clk_disable_unprepare(stm32_dmamux->clk); return ret; -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2020-05-24 6:04 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-05-24 6:02 Dinghao Liu [this message] 2020-05-24 6:02 ` [PATCH] dmaengine: stm32-dmamux: Fix runtime PM imbalance on error Dinghao Liu
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