[ 067/171 ] usb: gadget: ffs: fix enable multiple instances

[Steven Rostedt]

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

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

From: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxx>

[ Upstream commit 3416905ba058e43112ad7b1b4859797f027f5a07 ]

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@xxxxxxxxxx>
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>

[ balbi@xxxxxx : added offending commit's subject ]

Signed-off-by: Felipe Balbi <balbi@xxxxxx>
---
 drivers/usb/gadget/g_ffs.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/g_ffs.c b/drivers/usb/gadget/g_ffs.c
index d3ace90..919177b 100644
--- a/drivers/usb/gadget/g_ffs.c
+++ b/drivers/usb/gadget/g_ffs.c
@@ -358,7 +358,7 @@ static int gfs_bind(struct usb_composite_dev *cdev)
 	if (unlikely(ret < 0))
 		goto error;
 
-	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_composite_dev *cdev)
 		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);
 
-- 
1.7.10.4


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