Re: [PATCH 1/5] usb: gadget: ffs: call functionfs_unbind() if _ffs_func_bind() fails

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On 07/07/2015 04:53 PM, Dan Carpenter wrote:
On Tue, Jul 07, 2015 at 04:02:49PM +0200, Robert Baldyga wrote:
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 6e7be91..966b214 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -2897,11 +2897,19 @@ 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--;

Wait, why are we decrementing here?  ffs_func_unbind() already has a
decrement so this looks like a bug to me.  Add a comment if it's really
needed.

Decrement is done in ffs_func_unbind() which is not called in this error path. But after all I see another problem here, because we shouldn't call functionfs_unbind() if refcnt after decrement is not equal zero. I will fix it.


+		functionfs_unbind(func->ffs);

Thanks,
Robert Baldyga

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