usb: gadget: make sure each gadget is using same index for Product, Serial,…

The index in usb_string array is defined by the gadget. The gadget can
choose which index entry it assigns for the serial number and which the
product name. The gadget has just to ensure that the descriptor contains
the proper string id which is assigned by composite.
If the composite layer knows the index of the "default" information
which will be overwritten by module parameters, it can be used later to
overwrite it.

Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 6 insertions, 7 deletions

diff --git a/drivers/usb/gadget/serial.c b/drivers/usb/gadget/serial.c
index 27b5ce939bdb..768a38e896f7 100644
--- a/drivers/usb/gadget/serial.c
+++ b/drivers/usb/gadget/serial.c
@@ -59,15 +59,14 @@ USB_GADGET_COMPOSITE_OPTIONS();
 
 /* string IDs are assigned dynamically */
 
-#define STRING_MANUFACTURER_IDX         0
-#define STRING_PRODUCT_IDX              1
-#define STRING_DESCRIPTION_IDX          2
+#define STRING_DESCRIPTION_IDX          USB_GADGET_FIRST_AVAIL_IDX
 
 static char manufacturer[50];
 
 static struct usb_string strings_dev[] = {
-        [STRING_MANUFACTURER_IDX].s = manufacturer,
-        [STRING_PRODUCT_IDX].s = GS_VERSION_NAME,
+        [USB_GADGET_MANUFACTURER_IDX].s = manufacturer,
+        [USB_GADGET_PRODUCT_IDX].s = GS_VERSION_NAME,
+        [USB_GADGET_SERIAL_IDX].s = "",
         [STRING_DESCRIPTION_IDX].s = NULL /* updated; f(use_acm) */,
         {  } /* end of list */
 };
@@ -179,8 +178,8 @@ static int __init gs_bind(struct usb_composite_dev *cdev)
         status = usb_string_ids_tab(cdev, strings_dev);
         if (status < 0)
                 goto fail;
-        device_desc.iManufacturer = strings_dev[STRING_MANUFACTURER_IDX].id;
-        device_desc.iProduct = strings_dev[STRING_PRODUCT_IDX].id;
+        device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
+        device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
         status = strings_dev[STRING_DESCRIPTION_IDX].id;
         serial_config_driver.iConfiguration = status;