[PATCH v4 12/15] scsi_debug: Rework subpage code error handling

Bart Van Assche
2023-11-14T21:42:37Z

Move the subpage code checks into the switch statement to make it easier
to add support for new page code / subpage code combinations.

Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/scsi/scsi_debug.c | 70 ++++++++++++++++++++-------------------
1 file changed, 36 insertions(+), 34 deletions(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 12c3e3b68552..a16885fcec24 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -2697,22 +2697,22 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
ap = arr + offset;
}

- if ((subpcode > 0x0) && (subpcode < 0xff) && (0x19 != pcode)) {
- /* TODO: Control Extension page */
- mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1);
- return check_condition_result;
- }
-
switch (pcode) {
case 0x1: /* Read-Write error recovery page, direct access */
+ if (subpcode > 0x0 && subpcode < 0xff)
+ goto bad_subpcode;
len = resp_err_recov_pg(ap, pcontrol, target);
offset += len;
break;
case 0x2: /* Disconnect-Reconnect page, all devices */
+ if (subpcode > 0x0 && subpcode < 0xff)
+ goto bad_subpcode;
len = resp_disconnect_pg(ap, pcontrol, target);
offset += len;
break;
case 0x3: /* Format device page, direct access */
+ if (subpcode > 0x0 && subpcode < 0xff)
+ goto bad_subpcode;
if (is_disk) {
len = resp_format_pg(ap, pcontrol, target);
offset += len;
@@ -2721,6 +2721,8 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
}
break;
case 0x8: /* Caching page, direct access */
+ if (subpcode > 0x0 && subpcode < 0xff)
+ goto bad_subpcode;
if (is_disk || is_zbc) {
len = resp_caching_pg(ap, pcontrol, target);
offset += len;
@@ -2729,14 +2731,14 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
}
break;
case 0xa: /* Control Mode page, all devices */
+ if (subpcode > 0x0 && subpcode < 0xff)
+ goto bad_subpcode;
len = resp_ctrl_m_pg(ap, pcontrol, target);
offset += len;
break;
case 0x19: /* if spc==1 then sas phy, control+discover */
- if ((subpcode > 0x2) && (subpcode < 0xff)) {
- mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1);
- return check_condition_result;
- }
+ if (subpcode > 0x2 && subpcode < 0xff)
+ goto bad_subpcode;
len = 0;
if ((0x0 == subpcode) || (0xff == subpcode))
len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
@@ -2748,35 +2750,31 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
offset += len;
break;
case 0x1c: /* Informational Exceptions Mode page, all devices */
+ if (subpcode > 0x0 && subpcode < 0xff)
+ goto bad_subpcode;
len = resp_iec_m_pg(ap, pcontrol, target);
offset += len;
break;
case 0x3f: /* Read all Mode pages */
- if ((0 == subpcode) || (0xff == subpcode)) {
- len = resp_err_recov_pg(ap, pcontrol, target);
- len += resp_disconnect_pg(ap + len, pcontrol, target);
- if (is_disk) {
- len += resp_format_pg(ap + len, pcontrol,
- target);
- len += resp_caching_pg(ap + len, pcontrol,
- target);
- } else if (is_zbc) {
- len += resp_caching_pg(ap + len, pcontrol,
- target);
- }
- len += resp_ctrl_m_pg(ap + len, pcontrol, target);
- len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
- if (0xff == subpcode) {
- len += resp_sas_pcd_m_spg(ap + len, pcontrol,
- target, target_dev_id);
- len += resp_sas_sha_m_spg(ap + len, pcontrol);
- }
- len += resp_iec_m_pg(ap + len, pcontrol, target);
- offset += len;
- } else {
- mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1);
- return check_condition_result;
+ if (subpcode > 0x0 && subpcode < 0xff)
+ goto bad_subpcode;
+ len = resp_err_recov_pg(ap, pcontrol, target);
+ len += resp_disconnect_pg(ap + len, pcontrol, target);
+ if (is_disk) {
+ len += resp_format_pg(ap + len, pcontrol, target);
+ len += resp_caching_pg(ap + len, pcontrol, target);
+ } else if (is_zbc) {
+ len += resp_caching_pg(ap + len, pcontrol, target);
+ }
+ len += resp_ctrl_m_pg(ap + len, pcontrol, target);
+ len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
+ if (0xff == subpcode) {
+ len += resp_sas_pcd_m_spg(ap + len, pcontrol, target,
+ target_dev_id);
+ len += resp_sas_sha_m_spg(ap + len, pcontrol);
}
+ len += resp_iec_m_pg(ap + len, pcontrol, target);
+ offset += len;
break;
default:
goto bad_pcode;
@@ -2790,6 +2788,10 @@ static int resp_mode_sense(struct scsi_cmnd *scp,
bad_pcode:
mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 5);
return check_condition_result;
+
+bad_subpcode:
+ mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1);
+ return check_condition_result;
}

#define SDEBUG_MAX_MSELECT_SZ 512