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    Subject[PATCH 1/4 v2] Introduce ata_id_has_unload()
    Date
    Add a function to check an ATA device's id for head unload support as
    specified in ATA-7.

    Signed-off-by: Elias Oltmanns <eo@nebensachen.de>
    ---

    include/linux/ata.h | 9 +++++++++
    1 files changed, 9 insertions(+), 0 deletions(-)

    diff --git a/include/linux/ata.h b/include/linux/ata.h
    index cea079c..c66a7d6 100644
    --- a/include/linux/ata.h
    +++ b/include/linux/ata.h
    @@ -707,6 +707,15 @@ static inline int ata_id_has_dword_io(const u16 *id)
    return 0;
    }

    +static inline int ata_id_has_unload(const u16 *id)
    +{
    + if (ata_id_major_version(id) >= 7 &&
    + (id[ATA_ID_CFSSE] & 0xC000) == 0x4000 &&
    + id[ATA_ID_CFSSE] & (1 << 13))
    + return 1;
    + return 0;
    +}
    +
    static inline int ata_id_current_chs_valid(const u16 *id)
    {
    /* For ATA-1 devices, if the INITIALIZE DEVICE PARAMETERS command



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