USB: gadget: f_fs: use usb_string_ids_n()

Use usb_string_ids_n() function to simplify string ids
registeration.

Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 12 insertions, 18 deletions

diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c
index 282b49e336be..e4f595055208 100644
--- a/drivers/usb/gadget/f_fs.c
+++ b/drivers/usb/gadget/f_fs.c
@@ -1375,7 +1375,8 @@ static void ffs_data_reset(struct ffs_data *ffs)
 
 static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev)
 {
-        unsigned i, count;
+        struct usb_gadget_strings **lang;
+        int first_id;
 
         ENTER();
 
@@ -1383,7 +1384,9 @@ static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev)
                  || test_and_set_bit(FFS_FL_BOUND, &ffs->flags)))
                 return -EBADFD;
 
-        ffs_data_get(ffs);
+        first_id = usb_string_ids_n(cdev, ffs->strings_count);
+        if (unlikely(first_id < 0))
+                return first_id;
 
         ffs->ep0req = usb_ep_alloc_request(cdev->gadget->ep0, GFP_KERNEL);
         if (unlikely(!ffs->ep0req))
@@ -1391,25 +1394,16 @@ static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev)
         ffs->ep0req->complete = ffs_ep0_complete;
         ffs->ep0req->context = ffs;
 
-        /* Get strings identifiers */
-        for (count = ffs->strings_count, i = 0; i < count; ++i) {
-                struct usb_gadget_strings **lang;
-
-                int id = usb_string_id(cdev);
-                if (unlikely(id < 0)) {
-                        usb_ep_free_request(cdev->gadget->ep0, ffs->ep0req);
-                        ffs->ep0req = NULL;
-                        return id;
-                }
-
-                lang = ffs->stringtabs;
-                do {
-                        (*lang)->strings[i].id = id;
-                        ++lang;
-                } while (*lang);
+        lang = ffs->stringtabs;
+        for (lang = ffs->stringtabs; *lang; ++lang) {
+                struct usb_string *str = (*lang)->strings;
+                int id = first_id;
+                for (; str->s; ++id, ++str)
+                        str->id = id;
         }
 
         ffs->gadget = cdev->gadget;
+        ffs_data_get(ffs);
         return 0;
 }