add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/usb/core/hcd.c
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@@ -982,6 +982,7 @@
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 {
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 	struct device *parent_dev = hcd->self.controller;
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 	struct usb_device *usb_dev = hcd->self.root_hub;
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+	struct usb_device_descriptor *descr;
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 	const int devnum = 1;
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 	int retval;
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@@ -993,13 +994,16 @@
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 	mutex_lock(&usb_bus_idr_lock);
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 	usb_dev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
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-	retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
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-	if (retval != sizeof usb_dev->descriptor) {
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+	descr = usb_get_device_descriptor(usb_dev);
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+	if (IS_ERR(descr)) {
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+		retval = PTR_ERR(descr);
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 		mutex_unlock(&usb_bus_idr_lock);
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 		dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
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 				dev_name(&usb_dev->dev), retval);
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-		return (retval < 0) ? retval : -EMSGSIZE;
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+		return retval;
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 	}
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+	usb_dev->descriptor = *descr;
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+	kfree(descr);
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 	if (le16_to_cpu(usb_dev->descriptor.bcdUSB) >= 0x0201) {
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 		retval = usb_get_bos_descriptor(usb_dev);