We can have multiple usb_functions which origin is the same "instance".
Within one USB configuration there should be only one function of an
instance. This back pointer helps configfs to recoginze to which
instance a given usb_function belongs.
Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
---
drivers/usb/gadget/functions.c | 8 +++++++-
include/linux/usb/composite.h | 1 +
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/functions.c b/drivers/usb/gadget/functions.c
index f9cdf8e..b13f839 100644
--- a/drivers/usb/gadget/functions.c
+++ b/drivers/usb/gadget/functions.c
@@ -55,7 +55,13 @@ EXPORT_SYMBOL_GPL(usb_get_function_instance);
struct usb_function *usb_get_function(struct usb_function_instance *fi)
{
- return fi->fd->alloc_func(fi);
+ struct usb_function *f;
+
+ f = fi->fd->alloc_func(fi);
+ if (IS_ERR(f))
+ return f;
+ f->fi = fi;
+ return f;
}
EXPORT_SYMBOL_GPL(usb_get_function);
diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index 6596cc2..cde6a49 100644
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -161,6 +161,7 @@ struct usb_function {
/* internals */
struct list_head list;
DECLARE_BITMAP(endpoints, 32);
+ const struct usb_function_instance *fi;
};
int usb_add_function(struct usb_configuration *, struct usb_function *);
--
1.7.10.4
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