Re: [ROSE] [AX25] possible circular locking

On Tue, Dec 18, 2007 at 10:12:31PM +0100, Pidoux wrote:

Hi,

Thank you Jarek for the analysis of the circular locking dependency report.
I applied the patch you proposed and it works well as soon as I am able to 
reboot now without
lock warning message and I can also killall kissattach.

I tried also the patch without the loop, that is only spin_unlock_bh() 
before calling
ax25_disconnect() and spin_lock_bh() just after.
It worked also well.
However I must say that I only have one ax25 device running (ax0).

Is the loop really necessary here ? in case there are more than one ax25 
device ?

Also, I will let my AX25 - ROSE application running in order to test the 
system stability with the full patch.
I will let you know the results in a while.

Thank you Bernard for the bravery!

The loop is only for debugging: I don't know exactly what is done
during this ax25_disconnect(), and how the list can change in the
meantime because of some other activities. So, it's e.g. against
possible list_del of this node - then some sockets would stay not
disconnected.

I think, it's up to Ralf or some other ax25 expert to judge if this
could be done like this. Since it's not used very often, I think
this should better stay during testing: if there are no warnings
- the loop isn't repeated; otherwise it could simply take a little
more time, but all sockets should be serviced, plus we know about
problems.

Thanks,
Jarek P.