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424d66ceda
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>