linux-kernel - [ 87/98] usb: gadget: ffs: fix enable multiple instances

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Date:	Tue, 26 Mar 2013 15:43:16 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Michal Nazarewicz <mina86@...a86.com>,
	Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Felipe Balbi <balbi@...com>
Subject: [ 87/98] usb: gadget: ffs: fix enable multiple instances

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andrzej Pietrasiewicz <andrzej.p@...sung.com>

commit 3416905ba058e43112ad7b1b4859797f027f5a07 upstream.

This patch fixes an "off-by-one" bug found in
581791f (FunctionFS: enable multiple functions).

During gfs_bind/gfs_unbind the functionfs_bind/functionfs_unbind should be
called for every functionfs instance. With the "i" pre-decremented they
were not called for the zeroth instance.

Acked-by: Michal Nazarewicz <mina86@...a86.com>
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
[ balbi@...com : added offending commit's subject ]
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/gadget/g_ffs.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/usb/gadget/g_ffs.c
+++ b/drivers/usb/gadget/g_ffs.c
@@ -357,7 +357,7 @@ static int gfs_bind(struct usb_composite
 		goto error;
 	gfs_dev_desc.iProduct = gfs_strings[USB_GADGET_PRODUCT_IDX].id;
 
-	for (i = func_num; --i; ) {
+	for (i = func_num; i--; ) {
 		ret = functionfs_bind(ffs_tab[i].ffs_data, cdev);
 		if (unlikely(ret < 0)) {
 			while (++i < func_num)
@@ -413,7 +413,7 @@ static int gfs_unbind(struct usb_composi
 		gether_cleanup();
 	gfs_ether_setup = false;
 
-	for (i = func_num; --i; )
+	for (i = func_num; i--; )
 		if (ffs_tab[i].ffs_data)
 			functionfs_unbind(ffs_tab[i].ffs_data);
 


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