usb: gadget: config: Remove unused usb_gadget_config_buf

usb_gadget_config_buf() has been unused since 2012's
commit fa06920a3ece ("usb: gadget: Remove File-backed Storage Gadget
(g_file_storage).")

Remove it.

Signed-off-by: "Dr. David Alan Gilbert" <linux@treblig.org>
Link: https://lore.kernel.org/r/20250608233338.179894-2-linux@treblig.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 0 insertions, 57 deletions

diff --git a/drivers/usb/gadget/config.c b/drivers/usb/gadget/config.c
index 95f144a54ed9..256364d4b941 100644
--- a/drivers/usb/gadget/config.c
+++ b/drivers/usb/gadget/config.c
@@ -54,59 +54,6 @@ usb_descriptor_fillbuf(void *buf, unsigned buflen,
 EXPORT_SYMBOL_GPL(usb_descriptor_fillbuf);
 
 /**
- * usb_gadget_config_buf - builts a complete configuration descriptor
- * @config: Header for the descriptor, including characteristics such
- *	as power requirements and number of interfaces.
- * @buf: Buffer for the resulting configuration descriptor.
- * @length: Length of buffer.  If this is not big enough to hold the
- *	entire configuration descriptor, an error code will be returned.
- * @desc: Null-terminated vector of pointers to the descriptors (interface,
- *	endpoint, etc) defining all functions in this device configuration.
- *
- * This copies descriptors into the response buffer, building a descriptor
- * for that configuration.  It returns the buffer length or a negative
- * status code.  The config.wTotalLength field is set to match the length
- * of the result, but other descriptor fields (including power usage and
- * interface count) must be set by the caller.
- *
- * Gadget drivers could use this when constructing a config descriptor
- * in response to USB_REQ_GET_DESCRIPTOR.  They will need to patch the
- * resulting bDescriptorType value if USB_DT_OTHER_SPEED_CONFIG is needed.
- */
-int usb_gadget_config_buf(
-	const struct usb_config_descriptor	*config,
-	void					*buf,
-	unsigned				length,
-	const struct usb_descriptor_header	**desc
-)
-{
-	struct usb_config_descriptor		*cp = buf;
-	int					len;
-
-	/* config descriptor first */
-	if (length < USB_DT_CONFIG_SIZE || !desc)
-		return -EINVAL;
-	*cp = *config;
-
-	/* then interface/endpoint/class/vendor/... */
-	len = usb_descriptor_fillbuf(USB_DT_CONFIG_SIZE + (u8 *)buf,
-			length - USB_DT_CONFIG_SIZE, desc);
-	if (len < 0)
-		return len;
-	len += USB_DT_CONFIG_SIZE;
-	if (len > 0xffff)
-		return -EINVAL;
-
-	/* patch up the config descriptor */
-	cp->bLength = USB_DT_CONFIG_SIZE;
-	cp->bDescriptorType = USB_DT_CONFIG;
-	cp->wTotalLength = cpu_to_le16(len);
-	cp->bmAttributes |= USB_CONFIG_ATT_ONE;
-	return len;
-}
-EXPORT_SYMBOL_GPL(usb_gadget_config_buf);
-
-/**
  * usb_copy_descriptors - copy a vector of USB descriptors
  * @src: null-terminated vector to copy
  * Context: initialization code, which may sleep
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index df33333650a0..0f28c5512fcb 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -860,10 +860,6 @@ container_of(str_item, struct gadget_string, item)
 int usb_descriptor_fillbuf(void *, unsigned,
 		const struct usb_descriptor_header **);
 
-/* build config descriptor from single descriptor vector */
-int usb_gadget_config_buf(const struct usb_config_descriptor *config,
-	void *buf, unsigned buflen, const struct usb_descriptor_header **desc);
-
 /* copy a NULL-terminated vector of descriptors */
 struct usb_descriptor_header **usb_copy_descriptors(
 		struct usb_descriptor_header **);