add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/usb/core/urb.c
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@@ -71,9 +71,8 @@
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 {
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 	struct urb *urb;
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-	urb = kmalloc(sizeof(struct urb) +
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-		iso_packets * sizeof(struct usb_iso_packet_descriptor),
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-		mem_flags);
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+	urb = kmalloc(struct_size(urb, iso_frame_desc, iso_packets),
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+		      mem_flags);
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 	if (!urb)
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 		return NULL;
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 	usb_init_urb(urb);
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@@ -193,6 +192,28 @@
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 };
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 /**
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+ * usb_pipe_type_check - sanity check of a specific pipe for a usb device
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+ * @dev: struct usb_device to be checked
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+ * @pipe: pipe to check
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+ *
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+ * This performs a light-weight sanity check for the endpoint in the
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+ * given usb device.  It returns 0 if the pipe is valid for the specific usb
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+ * device, otherwise a negative error code.
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+ */
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+int usb_pipe_type_check(struct usb_device *dev, unsigned int pipe)
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+{
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+	const struct usb_host_endpoint *ep;
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+
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+	ep = usb_pipe_endpoint(dev, pipe);
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+	if (!ep)
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+		return -EINVAL;
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+	if (usb_pipetype(pipe) != pipetypes[usb_endpoint_type(&ep->desc)])
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+		return -EINVAL;
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+	return 0;
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+}
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+EXPORT_SYMBOL_GPL(usb_pipe_type_check);
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+
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+/**
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  * usb_urb_ep_type_check - sanity check of endpoint in the given urb
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  * @urb: urb to be checked
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  *
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@@ -202,14 +223,7 @@
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  */
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 int usb_urb_ep_type_check(const struct urb *urb)
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 {
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-	const struct usb_host_endpoint *ep;
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-
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-	ep = usb_pipe_endpoint(urb->dev, urb->pipe);
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-	if (!ep)
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-		return -EINVAL;
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-	if (usb_pipetype(urb->pipe) != pipetypes[usb_endpoint_type(&ep->desc)])
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-		return -EINVAL;
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-	return 0;
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+	return usb_pipe_type_check(urb->dev, urb->pipe);
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 }
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 EXPORT_SYMBOL_GPL(usb_urb_ep_type_check);
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@@ -475,7 +489,7 @@
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 	 */
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 	/* Check that the pipe's type matches the endpoint's type */
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-	if (usb_urb_ep_type_check(urb))
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+	if (usb_pipe_type_check(urb->dev, urb->pipe))
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 		dev_WARN(&dev->dev, "BOGUS urb xfer, pipe %x != type %x\n",
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 			usb_pipetype(urb->pipe), pipetypes[xfertype]);
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@@ -487,7 +501,7 @@
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 	case USB_ENDPOINT_XFER_INT:
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 		if (is_out)
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 			allowed |= URB_ZERO_PACKET;
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-		/* FALLTHROUGH */
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+		fallthrough;
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 	default:			/* all non-iso endpoints */
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 		if (!is_out)
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 			allowed |= URB_SHORT_NOT_OK;
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@@ -520,7 +534,7 @@
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 			if ((urb->interval < 6)
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 				&& (xfertype == USB_ENDPOINT_XFER_INT))
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 				return -EINVAL;
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-			/* fall through */
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+			fallthrough;
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 		default:
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 			if (urb->interval <= 0)
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 				return -EINVAL;