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[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>
This commit is contained in:
Rajashekhara, Mahesh 2010-05-10 04:17:57 -07:00 committed by James Bottomley
parent e3cc268fe4
commit 1fc8010a5d
1 changed files with 16 additions and 2 deletions
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16
drivers/scsi/aacraid/aachba.c
View File

@ -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;
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;