Re: [PATCH 06/11] usb: dwc3: imx8mp: use scoped device node handling to simplify error paths
From: Frank Li <Frank.li@nxp.com>
Date: 2024-08-14 15:44:08
Also in:
imx, linux-arm-msm, linux-usb, lkml
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 <redacted>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
quoted hunk ↗ jump to hunk
--- 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