tree 758428f68ad6290ffc04c287f7bfd6cc2df48df8
parent 6549e8b7f34b456d5689b98c2c0cf38c98414e47
author Artem Leonenko <tikkeri@gmail.com> 1292399150 -0800
committer Greg Kroah-Hartman <gregkh@suse.de> 1292535157 -0800

USB: gadget: update ci13xxx to work with g_ether

There is one nasty scenario when CI13xxx driver fails:
       a) two or more rx requests are queued (g_ether does that)
       b) rx request completed, interrupt fires and ci13xxx dequeues rq
       c) request complete() callback gets called and in turn it calls ep_queue()
               c1) in ep_queue() request gets added to the TAIL of the rx queue list
       d) ep gets primed with rq from (b)
       e) interrupt fires
       f) request gets popped from queue head for hw dequeue
       G) requets from queue head wasn't enqueued
               g1)  isr_tr_complete_low() doesn't
               enqueue more requests and it doesn't prime EP,
               rx traffic stalls

Solution:
       a) enque queued requests ASAP, i.e. before calling complete() callback.
       b) don't HW enqueue and prime endpoint with recently added request and
       use the oldest request in the queue.

Fixed issues:
       a) ep_queue() may return an error code despite request was successfully
       added to the queue (if _hardware_enqueue() fails)
       b) Added requests are always processed in LIFO order, even if they are
       added in complete() callback
       c) Finally more than two and more queued requests are processed consistently,
       even if they were added in complete() callback

The fix was successfully tested on MIPS based SoC with 4KEc CPU core and
CI13612 USB core. Board successfully boots with NFS root using g_ether
on ci13xxx udc.

Signed-off-by: Artem Leonenko <tikkeri@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>