[libata] Slightly improved no-op REQUEST SENSE, SEND DIAGNOSTIC

A few pedantic apps care about missing or lame "mandatory" SCSI
commands, so

REQUEST SENSE -- as we autosense, R.S. just returns zeroes

SEND DIAGNOSTIC -- our default (no-op) self-test succeeds, all
		   other requests for testing fail.

Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 13 insertions, 2 deletions

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index b39966299e7b..79550908adcc 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2912,6 +2912,7 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
 {
         struct ata_scsi_args args;
         const u8 *scsicmd = cmd->cmnd;
+        u8 tmp8;
 
         args.dev = dev;
         args.id = dev->id;
@@ -2926,7 +2927,6 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
                 case SEEK_10:
                 case TEST_UNIT_READY:
                 case FORMAT_UNIT:               /* FIXME: correct? */
-                case SEND_DIAGNOSTIC:           /* FIXME: correct? */
                         ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
                         break;
 
@@ -2979,8 +2979,19 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
                         ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
                         break;
 
-                /* mandatory commands we haven't implemented yet */
                 case REQUEST_SENSE:
+                        ata_scsi_set_sense(cmd, 0, 0, 0);
+                        cmd->result = (DRIVER_SENSE << 24);
+                        done(cmd);
+                        break;
+
+                case SEND_DIAGNOSTIC:
+                        tmp8 = scsicmd[1] & ~(1 << 3);
+                        if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
+                                ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
+                        else
+                                ata_scsi_invalid_field(cmd, done);
+                        break;
 
                 /* all other commands */
                 default: