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

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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 <[email protected]>
Signed-off-by: Felipe Balbi <[email protected]>
This commit is contained in:
Andrzej Pietrasiewicz 2015-02-06 13:43:30 +01:00 • committed by Felipe Balbi
commit d6d22922d9
4 changed files with 78 additions and 88 deletions
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2
Documentation/usb/gadget-testing.txt
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@ -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
--------------------------