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    SubjectRe: Regression between 2.6.20 and 2.6.21-rc1: NCQ problem with ahci and Hitachi drive
    Hello, Mathieu.

    Mathieu Bérard wrote:
    > Hello,
    > I have and laptop with an ICH6M SATA Controller and an Hitachi hard drive.
    > While it worked well using the ahci module and with NCQ enabled using
    > Linux 2.6.20, it does not work anymore (hang at boot) with 2.6.21-rc*
    >
    > My drive is among those that were recently blacklisted (see lkml post
    > "[PATCH] libata:
    > add NCQ blacklist entries from Silicon Image Windowsdriver)
    > (Model Number: HTS541010G9SA00 and Firmware Revision: MBZOC60D)
    > This blacklisting patch is in -mm now.
    > So there is probably a drive related issue here, I'm just wondering why
    > it just work
    > flawlessly with a 2.6.20...
    >
    > Relevant part of kernel log:
    > [ 16.044663] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
    > [ 16.089475] ata1.00: ATA-7: HTS541010G9SA00, MBZOC60D, max UDMA/100
    > [ 16.089525] ata1.00: 195371568 sectors, multi 0: LBA48 NCQ (depth 31/32)

    No, your drive isn't blacklisted yet. NCQ is still being enabled.

    > [ 16.091804] ata1.00: configured for UDMA/100
    > [ 18.151756] SCSI device sda: write cache: enabled, read cache:
    > enabled, doesn't support DPO or FUA
    [--snip--]
    > [ 18.151856] SCSI device sda: 195371568 512-byte hdwr sectors (100030 MB)
    > [ 18.151911] sda: Write Protect is off
    > [ 18.151977] SCSI device sda: write cache: enabled, read cache:
    > enabled, doesn't support DPO or FUA
    > [....]
    > [ 48.143940] ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x2
    > frozen
    > [ 48.143999] ata1.00: cmd 60/08:00:00:00:00/00:00:00:00:00/40 tag 0
    > cdb 0x0 data 4096 in
    > [ 48.144000] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask
    > 0x4 (timeout)

    It looks like IRQ isn't getting through. Does giving "acpi=off" kernel
    parameter make any difference?

    --
    tejun
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