On Wed, Aug 14, 2024 at 12:35:42PM +0200, Krzysztof Kozlowski wrote:
> Obtain the device node reference with scoped/cleanup.h to reduce error
> handling and make the code a bit simpler. Scoped/cleanup.h coding style
> expects variable declaration with initialization, so the
> of_get_compatible_child() call has to be moved earlier, before any goto
> jumps happen.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
> ---
> drivers/usb/dwc3/dwc3-imx8mp.c | 20 ++++++++------------
> 1 file changed, 8 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-imx8mp.c b/drivers/usb/dwc3/dwc3-imx8mp.c
> index 869b5e7c15ed..8b88649b569f 100644
> --- a/drivers/usb/dwc3/dwc3-imx8mp.c
> +++ b/drivers/usb/dwc3/dwc3-imx8mp.c
> @@ -5,6 +5,7 @@
> * Copyright (c) 2020 NXP.
> */
>
> +#include <linux/cleanup.h>
> #include <linux/clk.h>
> #include <linux/interrupt.h>
> #include <linux/io.h>
> @@ -147,7 +148,7 @@ static irqreturn_t dwc3_imx8mp_interrupt(int irq, void *_dwc3_imx)
> static int dwc3_imx8mp_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> - struct device_node *dwc3_np, *node = dev->of_node;
> + struct device_node *node = dev->of_node;
> struct dwc3_imx8mp *dwc3_imx;
> struct resource *res;
> int err, irq;
> @@ -193,6 +194,11 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev)
> return irq;
> dwc3_imx->irq = irq;
>
> + struct device_node *dwc3_np __free(device_node) = of_get_compatible_child(node,
> + "snps,dwc3");
> + if (!dwc3_np)
> + return dev_err_probe(dev, -ENODEV, "failed to find dwc3 core child\n");
> +
> imx8mp_configure_glue(dwc3_imx);
>
> pm_runtime_set_active(dev);
> @@ -201,17 +207,10 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev)
> if (err < 0)
> goto disable_rpm;
>
> - dwc3_np = of_get_compatible_child(node, "snps,dwc3");
> - if (!dwc3_np) {
> - err = -ENODEV;
> - dev_err(dev, "failed to find dwc3 core child\n");
> - goto disable_rpm;
> - }
> -
> err = of_platform_populate(node, NULL, NULL, dev);
> if (err) {
> dev_err(&pdev->dev, "failed to create dwc3 core\n");
> - goto err_node_put;
> + goto disable_rpm;
> }
>
> dwc3_imx->dwc3 = of_find_device_by_node(dwc3_np);
> @@ -220,7 +219,6 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev)
> err = -ENODEV;
> goto depopulate;
> }
> - of_node_put(dwc3_np);
>
> err = devm_request_threaded_irq(dev, irq, NULL, dwc3_imx8mp_interrupt,
> IRQF_ONESHOT, dev_name(dev), dwc3_imx);
> @@ -236,8 +234,6 @@ static int dwc3_imx8mp_probe(struct platform_device *pdev)
>
> depopulate:
> of_platform_depopulate(dev);
> -err_node_put:
> - of_node_put(dwc3_np);
> disable_rpm:
> pm_runtime_disable(dev);
> pm_runtime_put_noidle(dev);
>
> --
> 2.43.0
>
