[PATCH 4.19 47/86] dmaengine: tegra210-adma: Fix runtime PM imbalance on error

Greg Kroah-Hartman
2020-07-27T14:38:30Z

From: Dinghao Liu <dinghao.liu@zju.edu.cn>

[ Upstream commit 5b78fac4b1ba731cf4177fdbc1e3a4661521bcd0 ]

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>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://lore.kernel.org/r/20200624064626.19855-1-dinghao.liu@zju.edu.cn
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 045351f3549c1..86b45198fb962 100644
--- a/drivers/dma/tegra210-adma.c
+++ b/drivers/dma/tegra210-adma.c
@@ -583,6 +583,7 @@ 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;
}
@@ -764,8 +765,10 @@ 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)
--
2.25.1