(gdb) frame 3
#3 musb_host_rx (musb=0xdb3e0010, epnum=<optimized out>) at
../drivers/usb/musb/musb_host.c:1969
1969 done =
musb_rx_dma_inventra_cppi41(c, hw_ep, qh, urb, xfer_len);
(gdb) info locals
hw_ep = 0xdb3e0f48
c = <optimized out>
epio = <optimized out>
qh = 0xd9cb2000
xfer_len = <optimized out>
mbase = <optimized out>
iso_err = <optimized out>
done = <optimized out>
status = <optimized out>
dma = <optimized out>
__func__ = <error reading variable __func__ (Cannot access memory at
address 0x3e8)>
(gdb) print hw_ep
$21 = (struct musb_hw_ep *) 0xdb3e0f48
(gdb) print *hw_ep
$22 = {musb = 0xdb3e0010, fifo = 0xe0bf6c58, regs = 0xe0bf6c10, epnum
= 14 '\016', is_shared_fifo = true, tx_double_buffered = false,
rx_double_buffered = false, max_packet_sz_tx = 1024,
max_packet_sz_rx = 1024, tx_channel = 0x0, rx_channel = 0xd914c3bc,
in_qh = 0xd9cb2000, out_qh = 0xd9cb2000, rx_reinit = 0 '\000',
tx_reinit = 1 '\001', ep_in = {end_point = {driver_data = 0x0,
name = 0x0, ops = 0x0, ep_list = {next = 0x0, prev = 0x0}, caps
= {type_control = 0, type_iso = 0, type_bulk = 0, type_int = 0,
dir_in = 0, dir_out = 0}, claimed = false, enabled = false,
maxpacket = 0, maxpacket_limit = 0, max_streams = 0, mult = 0,
maxburst = 0, address = 0 '\000', desc = 0x0, comp_desc = 0x0},
name = '\000' <repeats 11 times>, hw_ep = 0x0, musb = 0x0,
current_epnum = 0 '\000', type = 0 '\000', is_in = 0 '\000',
packet_sz = 0, desc = 0x0, dma = 0x0, req_list = {next = 0x0,
prev = 0x0}, wedged = 0 '\000', busy = 0 '\000', hb_mult = 0
'\000'}, ep_out = {end_point = {driver_data = 0x0, name = 0x0,
ops = 0x0, ep_list = {next = 0x0, prev = 0x0}, caps =
{type_control = 0, type_iso = 0, type_bulk = 0, type_int = 0, dir_in =
0,
dir_out = 0}, claimed = false, enabled = false, maxpacket = 0,
maxpacket_limit = 0, max_streams = 0, mult = 0, maxburst = 0,
address = 0 '\000', desc = 0x0, comp_desc = 0x0}, name = '\000'
<repeats 11 times>, hw_ep = 0x0, musb = 0x0,
current_epnum = 0 '\000', type = 0 '\000', is_in = 0 '\000',
packet_sz = 0, desc = 0x0, dma = 0x0, req_list = {next = 0x0,
prev = 0x0}, wedged = 0 '\000', busy = 0 '\000', hb_mult = 0 '\000'}}
2016-05-20 23:55 GMT+03:00 Matwey V. Kornilov <matwey@xxxxxxxxxx>:
> I used kgdb. Is it ok?
> channel appeared to be 0x0:
>
> (gdb) continue
> Continuing.
> [Switching to Thread 315]
>
> Breakpoint 1, cppi41_dma_channel_program (channel=0x0, packet_sz=960,
> mode=0 '\000', dma_addr=2609136576, len=960)
> at ../drivers/usb/musb/musb_cppi41.c:481
> 481 {
> (gdb) bt
> #0 cppi41_dma_channel_program (channel=0x0, packet_sz=960, mode=0
> '\000', dma_addr=2609136576, len=960)
> at ../drivers/usb/musb/musb_cppi41.c:481
> #1 0xbf251570 in musb_rx_dma_iso_cppi41 (len=<optimized out>,
> urb=<optimized out>, qh=<optimized out>, hw_ep=<optimized out>,
> dma=<optimized out>) at ../drivers/usb/musb/musb_host.c:1569
> #2 musb_rx_dma_inventra_cppi41 (len=<optimized out>, urb=<optimized
> out>, qh=<optimized out>, hw_ep=<optimized out>,
> dma=<optimized out>) at ../drivers/usb/musb/musb_host.c:1652
> #3 musb_host_rx (musb=0xdb3e0010, epnum=<optimized out>) at
> ../drivers/usb/musb/musb_host.c:1969
> #4 0xbf249fb4 in musb_dma_completion (musb=<optimized out>,
> epnum=<optimized out>, transmit=<optimized out>)
> at ../drivers/usb/musb/musb_core.c:1693
> #5 0xbf258b10 in cppi41_trans_done (cppi41_channel=0xd914c3bc) at
> ../drivers/usb/musb/musb_cppi41.c:148
> #6 0xbf258c1c in cppi41_dma_callback (private_data=<optimized out>)
> at ../drivers/usb/musb/musb_cppi41.c:286
> #7 0xbf229f38 in ?? ()
> Backtrace stopped: previous frame identical to this frame (corrupt stack?)
>
>
> 2016-05-20 23:10 GMT+03:00 Bin Liu <b-liu@xxxxxx>:
>> Hi,
>>
>> On Fri, May 20, 2016 at 04:32:06PM +0300, Matwey V. Kornilov wrote:
>>> 2016-05-20 16:19 GMT+03:00 <matwey@xxxxxxxxxx>:
>>> > Hello,
>>> >
>>> > I am running 4.6-rc3 on BealgeBone Black and when I try to interract
>>> > with pwc webcam attached to usb port the following kernel panic
>>> > happening.
>>>
>>> Please note, that the same is happening with 4.6.0 release.
>>
>> Please apply the following patch and reproduce the oops, I'd like to
>> check if the oops is caused by NULL of hw_ep->in_qh.
>>
>> Regards,
>> -Bin.
>>
>> ---8<-------
>> diff --git a/drivers/usb/musb/musb_cppi41.c b/drivers/usb/musb/musb_cppi41.c
>> index e499b86..3492c6e 100644
>> --- a/drivers/usb/musb/musb_cppi41.c
>> +++ b/drivers/usb/musb/musb_cppi41.c
>> @@ -489,8 +489,11 @@ static int cppi41_dma_channel_program(struct dma_channel *channel,
>> if (is_host_active(cppi41_channel->controller->musb)) {
>> if (cppi41_channel->is_tx)
>> hb_mult = cppi41_channel->hw_ep->out_qh->hb_mult;
>> - else
>> + else {
>> + if (!cppi41_channel->hw_ep->in_qh)
>> + dev_err(NULL, "->in_qh is NULL\n");
>> hb_mult = cppi41_channel->hw_ep->in_qh->hb_mult;
>> + }
>> }
>>
>> channel->status = MUSB_DMA_STATUS_BUSY;
>>
>
>
>
> --
> With best regards,
> Matwey V. Kornilov.
> Sternberg Astronomical Institute, Lomonosov Moscow State University, Russia
> 119991, Moscow, Universitetsky pr-k 13, +7 (495) 9392382
--
With best regards,
Matwey V. Kornilov.
Sternberg Astronomical Institute, Lomonosov Moscow State University, Russia
119991, Moscow, Universitetsky pr-k 13, +7 (495) 9392382
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