[PATCH 3.16 105/129] scsi: virtio_scsi: don't send sc payload with tmfs

[Ben Hutchings]

3.16.70-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Felipe Franciosi <felipe@xxxxxxxxxxx>

commit 3722e6a52174d7c3a00e6f5efd006ca093f346c1 upstream.

The virtio scsi spec defines struct virtio_scsi_ctrl_tmf as a set of
device-readable records and a single device-writable response entry:

    struct virtio_scsi_ctrl_tmf
    {
        // Device-readable part
        le32 type;
        le32 subtype;
        u8 lun[8];
        le64 id;
        // Device-writable part
        u8 response;
    }

The above should be organised as two descriptor entries (or potentially
more if using VIRTIO_F_ANY_LAYOUT), but without any extra data after "le64
id" or after "u8 response".

The Linux driver doesn't respect that, with virtscsi_abort() and
virtscsi_device_reset() setting cmd->sc before calling virtscsi_tmf().  It
results in the original scsi command payload (or writable buffers) added to
the tmf.

This fixes the problem by leaving cmd->sc zeroed out, which makes
virtscsi_kick_cmd() add the tmf to the control vq without any payload.

Signed-off-by: Felipe Franciosi <felipe@xxxxxxxxxxx>
Reviewed-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/scsi/virtio_scsi.c | 2 --
 1 file changed, 2 deletions(-)

--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -631,7 +631,6 @@ static int virtscsi_device_reset(struct
 		return FAILED;
 
 	memset(cmd, 0, sizeof(*cmd));
-	cmd->sc = sc;
 	cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){
 		.type = VIRTIO_SCSI_T_TMF,
 		.subtype = VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET,
@@ -654,7 +653,6 @@ static int virtscsi_abort(struct scsi_cm
 		return FAILED;
 
 	memset(cmd, 0, sizeof(*cmd));
-	cmd->sc = sc;
 	cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){
 		.type = VIRTIO_SCSI_T_TMF,
 		.subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK,