[PATCH v2 2/3] scsi: lpfc: Report bsg mailbox failures as an errno

[Wentao Liang <vulab@iscas.ac.cn>]

lpfc_bsg_issue_mbox() hands a command to the port with MBX_NOWAIT and, if
that does not start the command, returns the raw result to
lpfc_bsg_mbox_cmd(), which stores it in the bsg reply.  bsg-lib only
reports a negative result as an error to the ioctl caller, so a positive
MBX status such as MBX_NOT_FINISHED is passed off as success, with
device_status holding the low byte of the status and no reply data.

Report -EIO instead, as the polled path in the same function already maps
its failures to -ETIME and -ENODEV.

Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
New in v2.

 drivers/scsi/lpfc/lpfc_bsg.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/scsi/lpfc/lpfc_bsg.c b/drivers/scsi/lpfc/lpfc_bsg.c
index 7354ae9ba8e5..00c54a8818ed 100644
--- a/drivers/scsi/lpfc/lpfc_bsg.c
+++ b/drivers/scsi/lpfc/lpfc_bsg.c
@@ -5106,6 +5106,11 @@ lpfc_bsg_issue_mbox(struct lpfc_hba *phba, struct bsg_job *job,
 	if ((rc == MBX_SUCCESS) || (rc == MBX_BUSY))
 		return 1; /* job started */
 
+	/* bsg-lib only reports a negative result as an error, so a status
+	 * from the MBX code space must not be passed back to it.
+	 */
+	rc = -EIO;
+
 job_done:
 	/* common exit for error or job completed inline */
 	if (pmboxq)