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    Subject[035/165] libata: Use Maximum Write Same Length to report discard size
    2.6.39-stable review patch.  If anyone has any objections, please let us know.

    ------------------
    limit
    Content-Length: 1118
    Lines: 33

    From: "Martin K. Petersen" <martin.petersen@oracle.com>

    commit 5f4e206666f834340b69ddb43f86de3851c8675a upstream.

    Previously we used Maximum Unmap LBA Count in the Block Limits VPD to
    signal the maximum number of sectors we could handle in a single Write
    Same command.

    Starting with SBC3r26 the Block Limits VPD has an explicit limit on the
    number of blocks in a Write Same. This means we can stop abusing a field
    related to the Unmap command and let our SAT use the proper value in the
    VPD (Maximum Write Same Length).

    Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
    Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    drivers/ata/libata-scsi.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/ata/libata-scsi.c
    +++ b/drivers/ata/libata-scsi.c
    @@ -2139,7 +2139,7 @@ static unsigned int ata_scsiop_inq_b0(st
    * with the unmap bit set.
    */
    if (ata_id_has_trim(args->id)) {
    - put_unaligned_be32(65535 * 512 / 8, &rbuf[20]);
    + put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
    put_unaligned_be32(1, &rbuf[28]);
    }




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