[libata scsi] add ata_scsi_set_sense helper

  - add extern ata_scsi_set_sense() to build SCSI
    fixed sense data and corresponding SCSI status

Signed-off-by: Douglas Gilbert <dougg@torque.net>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

2 files changed, 30 insertions, 0 deletions

diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 1c3a10fb3c44..bca9a5016b17 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -1451,6 +1451,34 @@ unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
 }
 
 /**
+ *      ata_scsi_set_sense - Set SCSI sense data and status
+ *      @cmd: SCSI request to be handled
+ *      @sk: SCSI-defined sense key
+ *      @asc: SCSI-defined additional sense code
+ *      @ascq: SCSI-defined additional sense code qualifier
+ *
+ *      Helper function that builds a valid fixed format, current
+ *      response code and the given sense key (sk), additional sense
+ *      code (asc) and additional sense code qualifier (ascq) with
+ *      a SCSI command status of %SAM_STAT_CHECK_CONDITION and
+ *      DRIVER_SENSE set in the upper bits of scsi_cmnd::result .
+ *
+ *      LOCKING:
+ *      Not required
+ */
+
+void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
+{
+        cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+
+        cmd->sense_buffer[0] = 0x70;    /* fixed format, current */
+        cmd->sense_buffer[2] = sk;
+        cmd->sense_buffer[7] = 18 - 8;  /* additional sense length */
+        cmd->sense_buffer[12] = asc;
+        cmd->sense_buffer[13] = ascq;
+}
+
+/**
  *      ata_scsi_badcmd - End a SCSI request with an error
  *      @cmd: SCSI request to be handled
  *      @done: SCSI command completion function
diff --git a/drivers/scsi/libata.h b/drivers/scsi/libata.h
index a4b55dc9c698..4622e643ffd3 100644
--- a/drivers/scsi/libata.h
+++ b/drivers/scsi/libata.h
@@ -80,6 +80,8 @@ extern unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
 extern void ata_scsi_badcmd(struct scsi_cmnd *cmd,
                             void (*done)(struct scsi_cmnd *),
                             u8 asc, u8 ascq);
+extern void ata_scsi_set_sense(struct scsi_cmnd *cmd,
+                               u8 sk, u8 asc, u8 ascq);
 extern void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
                         unsigned int (*actor) (struct ata_scsi_args *args,
                                            u8 *rbuf, unsigned int buflen));