Re: Linux USB file storage gadget with new UDC

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On Wed, 23 Jan 2013, victor yeo wrote:

> Here are the last two setup data and CBW data received. the
> get_next_command() is not called when CBW data is received. the

It's not supposed to be _called_; it's supposed to be _woken up_.

> bulk_out_complete() wakes up the thread, however, get_next_command()
> still sleeps.

Are you certain?  Maybe it gets woken up and then goes back to sleep.

> i do not see where req->length is checked in gadget
> driver.

It isn't _checked_; it is _set_ in set_bulk_out_req_length().  
req->actual is checked in received_cbw().

> g_file_storage gadget: ep0-setup, length 8:
> 00000000: 00 09 01 00 00 00 00 00
> g_file_storage gadget: set configuration
> g_file_storage gadget: ep0-setup, length 8:
> 00000000: a1 fe 00 00 00 00 01 00
> g_file_storage gadget: get max LUN
> g_file_storage gadget: ep0-in, length 1:
> 00000000: 00
> g_file_storage gadget: bulk-out, length 31:
> 00000000: 55 53 42 43 a8 48 ed 86 24 00 00 00 80 00 06 12
> 00000010: 00 00 00 24 00 00 00 00 00 00 00 00 00 00 00
> g_file_storage gadget: bulk_out_complete --> 0, 31/0

Why is the bulk_out_intended_length field set to 0?  Doesn't 
set_bulk_out_req_length() work right?

Alan Stern

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