linux-kernel - [PATCH v3 1/5] usb: gadget: ffs: call functionfs_unbind() if _ffs_func

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Date:	Mon, 13 Jul 2015 11:03:50 +0200
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	gregkh@...uxfoundation.org, balbi@...com
Cc:	nicolas.ferre@...el.com, dan.carpenter@...cle.com,
	sergei.shtylyov@...entembedded.com, mina86@...a86.com,
	andrzej.p@...sung.com, m.szyprowski@...sung.com,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Robert Baldyga <r.baldyga@...sung.com>
Subject: [PATCH v3 1/5] usb: gadget: ffs: call functionfs_unbind() if
 _ffs_func_bind() fails

Function ffs_do_functionfs_bind() calls functionfs_bind() which allocates
usb request and increments refcounts. These things needs to be cleaned
up by if further steps of initialization fail by calling functionfs_unbind().

Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
Acked-by: Michal Nazarewicz <mina86@...a86.com>
---
 drivers/usb/gadget/function/f_fs.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 6e7be91..adc6d52 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -2897,11 +2897,17 @@ static int ffs_func_bind(struct usb_configuration *c,
 			 struct usb_function *f)
 {
 	struct f_fs_opts *ffs_opts = ffs_do_functionfs_bind(f, c);
+	struct ffs_function *func = ffs_func_from_usb(f);
+	int ret;
 
 	if (IS_ERR(ffs_opts))
 		return PTR_ERR(ffs_opts);
 
-	return _ffs_func_bind(c, f);
+	ret = _ffs_func_bind(c, f);
+	if (ret && !--ffs_opts->refcnt)
+		functionfs_unbind(func->ffs);
+
+	return ret;
 }
 
 
-- 
1.9.1

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