From: Dinghao Liu <dinghao.liu@zju.edu.cn>
To: dinghao.liu@zju.edu.cn, kjlu@umn.edu
Cc: Laxman Dewangan <ldewangan@nvidia.com>,
Jon Hunter <jonathanh@nvidia.com>,
Dan Williams <dan.j.williams@intel.com>,
Vinod Koul <vkoul@kernel.org>,
Thierry Reding <thierry.reding@gmail.com>,
dmaengine@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] [v5] dmaengine: tegra210-adma: Fix runtime PM imbalance on error
Date: Wed, 24 Jun 2020 14:46:26 +0800 [thread overview]
Message-ID: <20200624064626.19855-1-dinghao.liu@zju.edu.cn> (raw)
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.
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
---
Changelog:
v2: - Merge two patches that fix runtime PM imbalance in
tegra_adma_probe() and tegra_adma_alloc_chan_resources()
respectively.
v3: - Use pm_runtime_put_noidle() instead of pm_runtime_put_sync()
in tegra_adma_alloc_chan_resources(). _noidle() is the simplest
one and it is sufficient for fixing this bug.
v4: - Use pm_runtime_put_noidle() instead of pm_runtime_put_sync()
in tegra_adma_probe(). _noidle() is the simplest one and it is
sufficient for fixing this bug.
v5: - Refine commit message.
---
drivers/dma/tegra210-adma.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c
index db58d7e4f9fe..c5fa2ef74abc 100644
--- a/drivers/dma/tegra210-adma.c
+++ b/drivers/dma/tegra210-adma.c
@@ -658,6 +658,7 @@ static int tegra_adma_alloc_chan_resources(struct dma_chan *dc)
ret = pm_runtime_get_sync(tdc2dev(tdc));
if (ret < 0) {
+ pm_runtime_put_noidle(tdc2dev(tdc));
free_irq(tdc->irq, tdc);
return ret;
}
@@ -869,8 +870,10 @@ static int tegra_adma_probe(struct platform_device *pdev)
pm_runtime_enable(&pdev->dev);
ret = pm_runtime_get_sync(&pdev->dev);
- if (ret < 0)
+ if (ret < 0) {
+ pm_runtime_put_noidle(&pdev->dev);
goto rpm_disable;
+ }
ret = tegra_adma_init(tdma);
if (ret)
--
2.17.1
next reply other threads:[~2020-06-24 6:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-24 6:46 Dinghao Liu [this message]
2020-06-24 8:58 ` [PATCH] [v5] dmaengine: tegra210-adma: Fix runtime PM imbalance on error Jon Hunter
2020-06-24 9:42 ` Vinod Koul
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