linux-kernel - [PATCHv2.1] USB: gadget: f_fs: use usb_string_ids

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Message-id: <54abfa6a4d85d26eebc9048ca2433c9f5141552e.1275057895.git.m.nazarewicz@samsung.com>
Date:	Fri, 28 May 2010 16:53:28 +0200
From:	Michal Nazarewicz <m.nazarewicz@...sung.com>
To:	linux-usb@...r.kernel.org
Cc:	David Brownell <dbrownell@...rs.sourceforge.net>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCHv2.1] 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@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
This fixes to silly bugs in my previous patch.  One was that first_id
was unsigned should "first_id < 0" would be always false and in the
"lang" loop I forgot to include ++lang.

 drivers/usb/gadget/f_fs.c |   29 +++++++++++------------------
 1 files changed, 11 insertions(+), 18 deletions(-)

diff --git a/drivers/usb/gadget/f_fs.c b/drivers/usb/gadget/f_fs.c
index 3fe120f..b7c4905 100644
--- a/drivers/usb/gadget/f_fs.c
+++ b/drivers/usb/gadget/f_fs.c
@@ -1377,7 +1377,8 @@ 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();
 
@@ -1385,7 +1386,9 @@ 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))
@@ -1393,25 +1396,15 @@ 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);
+	for (lang = ffs->stringtabs; *lang; ++lang) {
+		struct usb_string *str = (*lang)->strings;
+		unsigned id = first_id;
+		for (; str->s; ++id, ++str)
+			str->id = id;
 	}
 
 	ffs->gadget = cdev->gadget;
+	ffs_data_get(ffs);
 	return 0;
 }
 
-- 
1.7.1

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