Dear all,
I found a dealy loop in dl_reverse_done_list(), the while-loop doesn't exit
after the system prompts:
[ 0.880000] w90n740-ohci w90n740-ohci: GetStatus roothub.portstatus [0] =
0x00010101 CSC PPS CCS
[ 0.890000] hub_port_status outside.
[ 0.900000] hub 1-0:1.0: port 1, status 0101, change 0001, 12 Mb/s
[ 1.060000] hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms
status 0x101
[ 1.140000] w90n740-ohci w90n740-ohci: GetStatus roothub.portstatus [0] =
0x00100103 PRSC PPS PES CCS
[ 1.210000] usb 1-1: new full speed USB device using w90n740-ohci and
address 2
[ 1.310000] w90n740-ohci w90n740-ohci: GetStatus roothub.portstatus [0]
= 0x00100103 PRSC PPS PES CCS
But the USB system is worked well when the OHCI_VERBOSE_DEBUG is defined in
ohci-hcd.c. Is there anyone help me?
BTW, the kernel is uClinux-2.6.22, the CPU is Windond W90N740, and the DMA
is not implemented in this kernel.
static struct td *dl_reverse_done_list (struct ohci_hcd *ohci)
{
u32 td_dma;
struct td *td_rev = NULL;
struct td *td = NULL;
td_dma = hc32_to_cpup (ohci, &ohci->hcca->done_head);
ohci->hcca->done_head = 0;
wmb();
/* get TD from hc's singly linked list, and
* prepend to ours. ed->td_list changes later.
*/
while (td_dma) {
int cc;
td = dma_to_td (ohci, td_dma);
if (!td) {
ohci_err (ohci, "bad entry %8x\n", td_dma);
break;
}
td->hwINFO |= cpu_to_hc32 (ohci, TD_DONE);
cc = TD_CC_GET (hc32_to_cpup (ohci, &td->hwINFO));
/* Non-iso endpoints can halt on error; un-halt,
* and dequeue any other TDs from this urb.
* No other TD could have caused the halt.
*/
if (cc != TD_CC_NOERROR
&& (td->ed->hwHeadP & cpu_to_hc32 (ohci,
ED_H)))
td_rev = ed_halted (ohci, td, cc, td_rev);
td->next_dl_td = td_rev;
td_rev = td;
td_dma = hc32_to_cpup (ohci, &td->hwNextTD);
}
return td_rev;
}
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