CDC_PLAY_AUDIO check in cdrom_count_tracks() and other oddities

[Tejun Heo]

Hello, Jens.

I'm tracking down a bug where HAL doesn't mount media automatically.
It turned out that CDROM_DISC_STATUS wasn't reporting correct disc
type which was caused by CDC_PLAY_AUDIO check failure at the top of
cdrom_count_tracks().

I've went through MMC-3 but couldn't find anything which associates
play audio capability with READ_TOC.  READ_TOC was mandatory command,
so according to MMC-3, there's no reason to avoid issuing READ_TOC on
!CDC_PLAY_AUDIO.  Is there something I don't know?

Thanks.

-- 
tejun
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