[SCSI] aacraid: add support for handling ATA pass-through commands.

There are two conditions for ATA pass thru command that falls into
'SRB_STATUS_ERROR' condition.

1. When the "CC" bit is set by the host in ATA pass-through CDB

   - Even for the successful completion, SCSI target shall generate
     check condition.

   - Driver returns a result code of SAM_STAT_CHECK_CONDITION, with a
     driver byte of DID_OK to the mid layer.

     Below is the snippet of existing code which fills a result code
     of SAM_STAT_CHECK_CONDITION:

	***********************************
	        if (le32_to_cpu(srbreply->scsi_status) == SAM_STAT_CHECK_CONDITION) {
                		int len;
	               		scsicmd->result |= SAM_STAT_CHECK_CONDITION;
			..........
	************************************

2. When the "CC" bit is reset by the host and if SCSI target generates
   a check condition when an error occurs.

   - Driver returns a result code of SAM_STAT_CHECK_CONDITION, with a
     driver byte of DID_ERROR to the mid layer.

Signed-off-by: Mahesh Rajashekhara <aacraid@adaptec.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 16 insertions, 2 deletions

diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index 24b1ba06ece4..fdc7d9935aeb 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -2693,8 +2693,22 @@ static void aac_srb_callback(void *context, struct fib * fibptr)
                         scsicmd->cmnd[0],
                         le32_to_cpu(srbreply->scsi_status));
 #endif
-                scsicmd->result = DID_ERROR << 16 | COMMAND_COMPLETE << 8;
-                break;
+                if ((scsicmd->cmnd[0] == ATA_12)
+                  || (scsicmd->cmnd[0] == ATA_16)) {
+                        if (scsicmd->cmnd[2] & (0x01 << 5)) {
+                                scsicmd->result = DID_OK << 16
+                                                | COMMAND_COMPLETE << 8;
+                                break;
+                        } else {
+                                scsicmd->result = DID_ERROR << 16
+                                                | COMMAND_COMPLETE << 8;
+                                break;
+                        }
+                } else {
+                        scsicmd->result = DID_ERROR << 16
+                                        | COMMAND_COMPLETE << 8;
+                        break;
+                }
         }
         if (le32_to_cpu(srbreply->scsi_status) == SAM_STAT_CHECK_CONDITION) {
                 int len;