From: Qinglang Miao <miaoqinglang@huawei.com>
To: Vinod Koul <vkoul@kernel.org>,
Dan Williams <dan.j.williams@intel.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@st.com>
Cc: <dmaengine@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>,
Qinglang Miao <miaoqinglang@huawei.com>
Subject: [PATCH 1/3] dmaengine: stm32-dma: fix reference leak in stm32_dma
Date: Fri, 27 Nov 2020 17:45:23 +0800 [thread overview]
Message-ID: <20201127094525.121388-2-miaoqinglang@huawei.com> (raw)
In-Reply-To: <20201127094525.121388-1-miaoqinglang@huawei.com>
pm_runtime_get_sync will increment pm usage counter even it
failed. Forgetting to putting operation will result in a
reference leak here.
A new function pm_runtime_resume_and_get is introduced in
[0] to keep usage counter balanced. So We fix the reference
leak by replacing it with new funtion.
[0] dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
Fixes: 05f8740a0e6f ("dmaengine: stm32-dma: add suspend/resume power management support")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
---
drivers/dma/stm32-dma.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index d0055d2f0..1150aa90e 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -1187,7 +1187,7 @@ static int stm32_dma_alloc_chan_resources(struct dma_chan *c)
chan->config_init = false;
- ret = pm_runtime_get_sync(dmadev->ddev.dev);
+ ret = pm_runtime_resume_and_get(dmadev->ddev.dev);
if (ret < 0)
return ret;
@@ -1455,7 +1455,7 @@ static int stm32_dma_suspend(struct device *dev)
struct stm32_dma_device *dmadev = dev_get_drvdata(dev);
int id, ret, scr;
- ret = pm_runtime_get_sync(dev);
+ ret = pm_runtime_resume_and_get(dev);
if (ret < 0)
return ret;
--
2.23.0
next prev parent reply other threads:[~2020-11-27 9:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-27 9:45 [PATCH 0/3] dmaengine: stm32: fix reference leak Qinglang Miao
2020-11-27 9:45 ` Qinglang Miao [this message]
2020-11-27 9:45 ` [PATCH 2/3] dmaengine: stm32-dmamux: fix reference leak in stm32_dmamux Qinglang Miao
2020-11-27 9:45 ` [PATCH 3/3] dmaengine: stm32-mdma: fix reference leak in stm32-mdma Qinglang Miao
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