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    Subject[PATCH 4.16 065/279] scsi: storvsc: Set up correct queue depth values for IDE devices
    Date
    4.16-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Long Li <longli@microsoft.com>

    [ Upstream commit f286299c1d0ba5e2ca0377610307b370fe178767 ]

    Unlike SCSI and FC, we don't use multiple channels for IDE. Also fix
    the calculation for sub-channels.

    Signed-off-by: Long Li <longli@microsoft.com>
    Reviewed-by: Michael Kelley <mikelley@microsoft.com>
    Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/scsi/storvsc_drv.c | 7 +++++--
    1 file changed, 5 insertions(+), 2 deletions(-)

    --- a/drivers/scsi/storvsc_drv.c
    +++ b/drivers/scsi/storvsc_drv.c
    @@ -1722,11 +1722,14 @@ static int storvsc_probe(struct hv_devic
    max_targets = STORVSC_MAX_TARGETS;
    max_channels = STORVSC_MAX_CHANNELS;
    /*
    - * On Windows8 and above, we support sub-channels for storage.
    + * On Windows8 and above, we support sub-channels for storage
    + * on SCSI and FC controllers.
    * The number of sub-channels offerred is based on the number of
    * VCPUs in the guest.
    */
    - max_sub_channels = (num_cpus / storvsc_vcpus_per_sub_channel);
    + if (!dev_is_ide)
    + max_sub_channels =
    + (num_cpus - 1) / storvsc_vcpus_per_sub_channel;
    }

    scsi_driver.can_queue = (max_outstanding_req_per_channel *

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