tree cd232df29974be404978d47a2257c9422272d304
parent b6d9c125e6610591c04ca9045f641e35ce1a9226
author Stefan Richter <stefanr@s5r6.in-berlin.de> 1279792598 +0200
committer Stefan Richter <stefanr@s5r6.in-berlin.de> 1280221451 +0200

firewire: nosy: fix device shutdown with active client

Fix race between nosy_open() and remove_card() by replacing the
unprotected array of card pointers by a mutex-protected list of cards.

Make card instances reference-counted and let each client hold a
reference.

Notify clients about card removal via POLLHUP in poll()'s events
bitmap; also let read() fail with errno=ENODEV if the card was removed
and everything in the buffer was read.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>