usb: gadget: rndis: remove the limit of available rndis connections

RNDIS function has a limitation on the number of allowed instances.
So far it has been RNDIS_MAX_CONFIGS, which happens to be one.
In order to eliminate this kind of arbitrary limitation we should not
preallocate a predefined (RNDIS_MAX_CONFIGS) array of struct rndis_params
instances but instead allow allocating them on demand.

This patch allocates struct rndis_params on demand in rndis_register().
Coversly, the structure is free()'d in rndis_deregister().
If CONFIG_USB_GADGET_DEBUG_FILES is set, the proc files are created which
is the same behaviour as before, but the moment of creation is delayed
until struct rndis_params is actually allocated.

rnids_init() and rndis_exit() have nothing to do, so they are eliminated.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/Documentation/usb/gadget-testing.txt b/Documentation/usb/gadget-testing.txt
index 7769eee..5926780 100644 (file)
--- a/Documentation/usb/gadget-testing.txt
+++ b/Documentation/usb/gadget-testing.txt
@@ -526,8 +526,6 @@ Except for ifname they can be written to until the function is linked to a
 configuration. The ifname is read-only and contains the name of the interface
 which was assigned by the net core, e. g. usb0.
 
-By default there can be only 1 RNDIS interface in the system.
-
 Testing the RNDIS function
 --------------------------
 

diff --git a/drivers/usb/gadget/function/f_rndis.c b/drivers/usb/gadget/function/f_rndis.c
index 2dafe72..32985da 100644 (file)
--- a/drivers/usb/gadget/function/f_rndis.c
+++ b/drivers/usb/gadget/function/f_rndis.c
@@ -1012,26 +1012,6 @@ static struct usb_function *rndis_alloc(struct usb_function_instance *fi)
        return &rndis->port.func;
 }
 
-DECLARE_USB_FUNCTION(rndis, rndis_alloc_inst, rndis_alloc);
-
-static int __init rndis_mod_init(void)
-{
-       int ret;
-
-       ret = rndis_init();
-       if (ret)
-               return ret;
-
-       return usb_function_register(&rndisusb_func);
-}
-module_init(rndis_mod_init);
-
-static void __exit rndis_mod_exit(void)
-{
-       usb_function_unregister(&rndisusb_func);
-       rndis_exit();
-}
-module_exit(rndis_mod_exit);
-
+DECLARE_USB_FUNCTION_INIT(rndis, rndis_alloc_inst, rndis_alloc);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("David Brownell");

diff --cc drivers/usb/gadget/function/rndis.c
Simple merge

diff --cc drivers/usb/gadget/function/u_rndis.h
Simple merge