diff options
| author | Zhang Qilong <zhangqilong3@huawei.com> | 2020-11-22 06:22:37 +0300 |
|---|---|---|
| committer | Santosh Shilimkar <santosh.shilimkar@oracle.com> | 2020-11-22 06:22:37 +0300 |
| commit | b4fa73358c306d747a2200aec6f7acb97e5750e6 (patch) | |
| tree | ffbb898abf73523390f1cf05e05a04b996d4e352 /drivers/soc/ti | |
| parent | 8465c7d1001a86e87f03124dc4a35760e731af62 (diff) | |
| download | linux-b4fa73358c306d747a2200aec6f7acb97e5750e6.tar.xz | |
soc: ti: Fix reference imbalance in knav_dma_probe
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@huawei.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Diffstat (limited to 'drivers/soc/ti')
| -rw-r--r-- | drivers/soc/ti/knav_dma.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/soc/ti/knav_dma.c b/drivers/soc/ti/knav_dma.c index b2d63d8854d6..7b5cb5d48f7d 100644 --- a/drivers/soc/ti/knav_dma.c +++ b/drivers/soc/ti/knav_dma.c @@ -749,8 +749,9 @@ 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 */ @@ -764,7 +765,8 @@ 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, @@ -772,6 +774,13 @@ static int knav_dma_probe(struct platform_device *pdev) device_ready = true; 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) |