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[SCSI] fix the new host byte settings (DID_TARGET_FAILURE and DID_NEXUS_FAILURE)

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This patch fixes the host byte settings DID_TARGET_FAILURE and
DID_NEXUS_FAILURE.  The function __scsi_error_from_host_byte, tries to reset
the host byte to DID_OK. But that does not happen because of the OR operation.

Here is the flow.

scsi_softirq_done-> scsi_decide_disposition -> __scsi_error_from_host_byte

Let's take an example with DID_NEXUS_FAILURE. In scsi_decide_disposition,
result will be set as DID_NEXUS_FAILURE (=0x11). Then in
__scsi_error_from_host_byte, when we do OR with DID_OK.  Purpose is to reset
it back to DID_OK. But that does not happen.  This patch fixes this issue.

Signed-off-by: Babu Moger <babu.moger@netapp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Moger, Babu 2012-01-24 20:38:46 +00:00 committed by James Bottomley
parent 3384db9eb8
commit 2082ebc45a
2 changed files with 4 additions and 4 deletions
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4
drivers/scsi/scsi_error.c
View File

@ -1540,7 +1540,7 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd)
* Need to modify host byte to signal a
* permanent target failure
*/
scmd->result |= (DID_TARGET_FAILURE << 16);
set_host_byte(scmd, DID_TARGET_FAILURE);
rtn = SUCCESS;
}
/* if rtn == FAILED, we have no sense information;
@ -1560,7 +1560,7 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd)
case RESERVATION_CONFLICT:
sdev_printk(KERN_INFO, scmd->device,
"reservation conflict\n");
scmd->result |= (DID_NEXUS_FAILURE << 16);
set_host_byte(scmd, DID_NEXUS_FAILURE);
return SUCCESS; /* causes immediate i/o error */
default:
return FAILED;

4
drivers/scsi/scsi_lib.c
View File

@ -682,11 +682,11 @@ static int __scsi_error_from_host_byte(struct scsi_cmnd *cmd, int result)
error = -ENOLINK;
break;
case DID_TARGET_FAILURE:
cmd->result |= (DID_OK << 16);
set_host_byte(cmd, DID_OK);
error = -EREMOTEIO;
break;
case DID_NEXUS_FAILURE:
cmd->result |= (DID_OK << 16);
set_host_byte(cmd, DID_OK);
error = -EBADE;
break;
default: