Hi Wen
On 2/3/19 4:52 AM, wen yang wrote:
> The call to of_find_node_by_name returns a node pointer with refcount
> incremented thus it must be explicitly decremented here after the last
> usage.
> The of_find_device_by_node() takes a reference to the underlying device
> structure, we also should release that reference.
> This patch fixes those 2 issues.
>
> Signed-off-by: Wen Yang <yellowriver2010@xxxxxxxxxxx>
> Cc: Patrice Chotard <patrice.chotard@xxxxxx>
> Cc: Felipe Balbi <balbi@xxxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-usb@xxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> ---
> drivers/usb/dwc3/dwc3-st.c | 10 +++++++---
> 1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-st.c b/drivers/usb/dwc3/dwc3-st.c
> index 1608138..fdd90d2 100644
> --- a/drivers/usb/dwc3/dwc3-st.c
> +++ b/drivers/usb/dwc3/dwc3-st.c
> @@ -262,17 +262,18 @@ static int st_dwc3_probe(struct platform_device *pdev)
> ret = of_platform_populate(node, NULL, NULL, dev);
> if (ret) {
> dev_err(dev, "failed to add dwc3 core\n");
> - goto undo_softreset;
> + goto put_node;
> }
>
> child_pdev = of_find_device_by_node(child);
> if (!child_pdev) {
> dev_err(dev, "failed to find dwc3 core device\n");
> ret = -ENODEV;
> - goto undo_softreset;
> + goto put_node;
> }
>
> dwc3_data->dr_mode = usb_get_dr_mode(&child_pdev->dev);
> + put_device(&child_pdev->dev);
>
> /*
> * Configure the USB port as device or host according to the static
> @@ -283,15 +284,18 @@ static int st_dwc3_probe(struct platform_device *pdev)
> ret = st_dwc3_drd_init(dwc3_data);
> if (ret) {
> dev_err(dev, "drd initialisation failed\n");
> - goto undo_softreset;
> + goto put_node;
> }
>
> /* ST glue logic init */
> st_dwc3_init(dwc3_data);
>
> platform_set_drvdata(pdev, dwc3_data);
> + of_node_put(child);
> return 0;
>
> +put_node:
> + of_node_put(child);
> undo_softreset:
> reset_control_assert(dwc3_data->rstc_rst);
> undo_powerdown:
>
Reviewed-by: Patrice Chotard <patrice.chotard@xxxxxx>
Thanks
