Re: [Libmtp-discuss] libmtp error: could not get object handles for some directories

[Andrea V. <and...@un...>]

Il giorno sab, 26/05/2018 alle 16.41 -0700, Philip Langdale ha
scritto:
> > What I have discovered so far (not much, I suppose), when the
> script
> > (mtp-filetree) accesses the failing directory:
> > 
> > - the directory name (and a number on the left, are we interested
> in
> > it?) is displayed;
> > - sendreq_func is called;
> > - getdata_func is called;
> > - php_usb_getdata is called;
> > - the following directory is displayed.
> 
> Ok, so the ptp_usb_getdata is failing here - this is not a huge
> surprise. And it's timing out right? (the 60 second timeout is at
> this point?)

yes it is, sorry for not having specified it.

So the complete steps are:

- When the directory contains 124 files:
  - the directory name is displayed;
  - sendreq_func is called;
  - getdata_func is called;
  - php_usb_getdata is called;
--> the delay happens;
  - the following directory is displayed.

- When the directory contains 123 files:
  - the directory name is displayed;
  - the following happen 247 times:
    - sendreq_func is called;
    - getdata_func is called;
    - php_usb_getdata is called;
  - each file in the directory is displayed;
  - the following directory is displayed.

> 
> So, you'll want to see what happens with ptp_usb_getpacket inside
> the
> call to ptp_usb_getdata. How many times is it called

it is called once each time php_usb_getdata is called

> , and what happens
> the last time it is called?

my test doesn't reveal anything as far as I can tell, do we need to
put some debug inside the php_usb_getdata function?

>  Also useful to compare to the situation
> with 123 files where it works correctly. What is the same and what
> is
> different.

Here is the detail:

- When the directory contains 123 files:
  - the directory name is displayed;
  - the following happen 247 times:
    - sendreq_func is called;
    - getdata_func is called;
    - php_usb_getdata is called;
    - ptp_usb_getpacket is called;
  - each file in the directory is displayed;
  - the following directory is displayed.

- When the directory contains 124 files:
  - the directory name is displayed;
  - sendreq_func is called;
  - getdata_func is called;
  - php_usb_getdata is called;
  - ptp_usb_getpacket is called;
  - the delay happens;
  - the following directory is displayed.

Thanks, and bye,
Andrea