From: Stefan Richter <stefanr@s5r6.in-berlin.de>
Date: Thu, 22 Jul 2010 09:56:38 +0000 (+0200)
Subject: firewire: nosy: fix device shutdown with active client
X-Git-Tag: v2.6.36-rc1~490^2^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=424d66cedae8bebb00fdb917fc8430f7b8a655cf;p=pandora-kernel.git

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>
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