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    Subject[56/66] [SCSI] libsas: fix NCQ mixing with non-NCQ
    2.6.36-stable review patch.  If anyone has any objections, please let us know.


    From: David Milburn <>

    commit f0ad30d3d2dc924decc0e10b1ff6dc32525a5d99 upstream.

    Some cards (like mvsas) have issue troubles if non-NCQ commands are
    mixed with NCQ ones. Fix this by using the libata default NCQ check
    routine which waits until all NCQ commands are complete before issuing
    a non-NCQ one. The impact to cards (like aic94xx) which don't need
    this logic should be minimal

    Signed-off-by: James Bottomley <>
    Signed-off-by: Greg Kroah-Hartman <>

    drivers/scsi/libsas/sas_ata.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/drivers/scsi/libsas/sas_ata.c
    +++ b/drivers/scsi/libsas/sas_ata.c
    @@ -347,6 +347,7 @@ static int sas_ata_scr_read(struct ata_l
    static struct ata_port_operations sas_sata_ops = {
    .phy_reset = sas_ata_phy_reset,
    .post_internal_cmd = sas_ata_post_internal,
    + .qc_defer = ata_std_qc_defer,
    .qc_prep = ata_noop_qc_prep,
    .qc_issue = sas_ata_qc_issue,
    .qc_fill_rtf = sas_ata_qc_fill_rtf,

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