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    Subjectreadcd hangs in blk_execute_rq
    I'm trying to readcd a cd, in 2.6.9+todays BK snapshot.

    I got an error the first time so I started it (readcd dev=/dev/hdc)
    the second time and chose c2scan. This resulted in the messages
    ...
    end: 328460
    C2 in sector: 1864 first at byte: 2256 (0xF0) total: 72 errors
    C2 in sector: 1865 first at byte: 12 (0x0F) total: 2335 errors
    addr: 2499 cnt: 49

    And here it hangs. ps shows readcd is in D state, in blk_execute_rq.
    dmesg shows lines of

    hdc: lost interrupt

    every no and then.

    This a IDE CD on Intel ICH2 ide controller:

    ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
    ICH2: IDE controller at PCI slot 0000:00:1f.1
    ICH2: chipset revision 2
    ICH2: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA, hdb:pio
    ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:DMA, hdd:pio

    hdc: CDU5211, ATAPI CD/DVD-ROM drive
    hdc: ATAPI 52X CD-ROM drive, 120kB Cache, UDMA(33)

    And after every boot it gets DMA timeout on first read and switches to
    PIO mode and works fine there reading data cd-s (even browsing the same
    CD):

    ide-cd: cmd 0x28 timed out
    hdc: DMA interrupt recovery
    hdc: lost interrupt
    hdc: status timeout: status=0xd0 { Busy }
    hdc: status timeout: error=0x00
    hdc: DMA disabled
    hdc: drive not ready for command
    hdc: ATAPI reset complete


    --
    Meelis Roos (mroos@linux.ee)

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