cdrom.c : dropping to single frame dma fix

Hi Jens,

Well I got a patch to stop cdrom.c from dropping to single frame as long as it has done multi-frame at least once and it seems to work for me but I obviously am not sure what implications this will have for lots of other users.

I was wondering if there was a way for the cdrom module to know when the media gets changed so that the flag can be cleared and only reset if we can do multi-frame DMA with the new media?

I have been digging through the code but can't see an obvious place where this happens, pointers and other comments welcome.

Currently I've got 2.6.7-rc3 patched, would you accept or you want me to check it goes cleanly into the latest and greatest?

Cheers,

Nige