Am 28.01.2014 09:31, schrieb Gianluca Anzolin:
Unfortunately it seems I overlooked the fact that rfcomm_dev_activate() is
called with the port->mutex held. So patches 2/3/4 cause a regression I missed
because I didn't turn on the appropriate debug options (circular locking
dependency, a bug report already appeared on this list).
I'm afraid this all stems from my partial knowledge of the tty_port code and
unfortunately I don't know how to solve the problem right now.
Understandable, it's like a mine field. ;) Maybe it might make sense to
add Alan Cox to Cc, I think he's active again and knows a lot about
tty_port.
I think it's better to revert those patches for the moment.
I prefer to still use those patches because without them, I have a more
serious problem (at least for my use cases, which happily haven't run
into that deadlock).
But thanks for notifying me/us about the possibility of a deadlock when
using your patches.
Regards,
Alexander Holler
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