[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20201228124848.952887186@linuxfoundation.org>
Date: Mon, 28 Dec 2020 13:48:56 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Zhang Qilong <zhangqilong3@...wei.com>,
Santosh Shilimkar <santosh.shilimkar@...cle.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 052/132] soc: ti: Fix reference imbalance in knav_dma_probe
From: Zhang Qilong <zhangqilong3@...wei.com>
[ Upstream commit b4fa73358c306d747a2200aec6f7acb97e5750e6 ]
The patch fix two reference leak.
1) pm_runtime_get_sync will increment pm usage counter even it
failed. Forgetting to call put operation will result in
reference leak.
2) The pm_runtime_enable will increase power disable depth. Thus
a pairing decrement is needed on the error handling path to
keep it balanced.
We fix it by: 1) adding call pm_runtime_put_noidle or
pm_runtime_put_sync in error handling. 2) adding pm_runtime_disable
in error handling, to keep usage counter and disable depth balanced.
Fixes: 88139ed030583 ("soc: ti: add Keystone Navigator DMA support")
Signed-off-by: Zhang Qilong <zhangqilong3@...wei.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/soc/ti/knav_dma.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/soc/ti/knav_dma.c b/drivers/soc/ti/knav_dma.c
index bc1b80ec6afe3..838b87adf48bb 100644
--- a/drivers/soc/ti/knav_dma.c
+++ b/drivers/soc/ti/knav_dma.c
@@ -752,8 +752,9 @@ static int knav_dma_probe(struct platform_device *pdev)
pm_runtime_enable(kdev->dev);
ret = pm_runtime_get_sync(kdev->dev);
if (ret < 0) {
+ pm_runtime_put_noidle(kdev->dev);
dev_err(kdev->dev, "unable to enable pktdma, err %d\n", ret);
- return ret;
+ goto err_pm_disable;
}
/* Initialise all packet dmas */
@@ -767,13 +768,21 @@ static int knav_dma_probe(struct platform_device *pdev)
if (list_empty(&kdev->list)) {
dev_err(dev, "no valid dma instance\n");
- return -ENODEV;
+ ret = -ENODEV;
+ goto err_put_sync;
}
debugfs_create_file("knav_dma", S_IFREG | S_IRUGO, NULL, NULL,
&knav_dma_debug_ops);
return ret;
+
+err_put_sync:
+ pm_runtime_put_sync(kdev->dev);
+err_pm_disable:
+ pm_runtime_disable(kdev->dev);
+
+ return ret;
}
static int knav_dma_remove(struct platform_device *pdev)
--
2.27.0
Powered by blists - more mailing lists