When communicating with accessory devices via USBFS, the initialisation
call-stack looks like:
ConfigFS > Gadget ConfigFS > UDC > Gadget ConfigFS > Composite
Eventually ending up in composite_dev_prepare() where memory for the
data buffer is allocated and initialised. The default size used for the
allocation is USB_COMP_EP0_BUFSIZ (4k). When handling bulk transfers,
acc_ctrlrequest() needs to be able to handle buffers up to
BULK_BUFFER_SIZE (16k). Instead of adding new generic attributes to
'struct usb_request' to track the size of the allocated buffer, we can
simply split off the affected thread of execution to travel via a
knowledgeable abstracted function acc_ctrlrequest_composite() where we
can complete the necessary specific checks.
Bug: 264029575
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: Ia1280f85499621d3fa57f7262b4a2c80f4be7773
Signed-off-by: Lee Jones <joneslee@google.com>
f632042365