[U-Boot] Question: issues for usb keyboard work with OHCI HCD

[Bo Shen <voice.shen@atmel.com>]

Hi All,
   Now, I test usb host support with Atmel boards, for example, 
at91sam9x5ek board.

   When test OHCI USB host with usb keyboard. I meet the following issue.
--->8---
U-Boot 2013.04-dirty (May 03 2013 - 11:00:34)

CPU: AT91SAM9G35
Crystal frequency:       12 MHz
CPU clock        :      400 MHz
Master clock     :  133.333 MHz
DRAM:  128 MiB
WARNING: Caches not enabled
NAND:  256 MiB
MMC:   mci: 0
In:    serial
Out:   serial
Err:   serial
Net:   macb0
Hit any key to stop autoboot:  0
U-Boot> usb start
(Re)start USB...
USB0:   scanning bus 0 for devices... 2 USB Device(s) found
        scanning usb for storage devices... 0 Storage Device(s) found
U-Boot> setenv stdin usbkbd
U-Boot> ERROR: sohci_submit_job: ENOMEM
ERROR: sohci_submit_job failed
... ...
(repeat to print these two error line)
---<8---

   After dig the usb ohci-hcd.c driver, I found every time it call 
submit_int_msg -->
submit_common_msg --> sohci_submit_job, it will allocate memory for td 
(just call td_alloc),
however nowhere free the td. So, after allocate 64 times (#define NUM_TD 
64),
all the ptd[i].usb_dev is not NULL. So, it will report: ENOMEM.

   I don't know why in sohci_return_job it call td_submit_job again?
--->8---
static inline int sohci_return_job(struct ohci *hc, urb_priv_t *urb)
{
     struct ohci_regs *regs = hc->regs;

     switch (usb_pipetype(urb->pipe)) {
     case PIPE_INTERRUPT:
         /* implicitly requeued */
         if (urb->dev->irq_handle &&
                 (urb->dev->irq_act_len = urb->actual_length)) {
             ohci_writel(OHCI_INTR_WDH, &regs->intrenable);
             ohci_readl(&regs->intrenable); /* PCI posting flush */
             urb->dev->irq_handle(urb->dev);
             ohci_writel(OHCI_INTR_WDH, &regs->intrdisable);
             ohci_readl(&regs->intrdisable); /* PCI posting flush */
         }
         urb->actual_length = 0;
         td_submit_job(
                 urb->dev,
                 urb->pipe,
                 urb->transfer_buffer,
                 urb->transfer_buffer_length,
                 NULL,
                 urb,
                 urb->interval);
         break
---<8---

   Add where should we free the allocated td to fix the issue?

   Thanks.

Best Regards,
Bo Shen