target/pscsi: call spc_emulate_report_luns directly

No need to indirect through spc_parse_cdb if we only ever call it for
REPORT LUNS emulation.

(nab: Add missing EXPORT_SYMBOL for spc_emulate_report_luns)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_pscsi.c

@@ -985,8 +985,6 @@ static inline void pscsi_clear_cdb_lun(unsigned char *cdb)
 static int pscsi_parse_cdb(struct se_cmd *cmd)
 {
 	unsigned char *cdb = cmd->t_task_cdb;
-	unsigned int dummy_size;
-	int ret;
 
 	if (cmd->se_cmd_flags & SCF_BIDI) {
 		cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
@@ -1003,10 +1001,7 @@ static int pscsi_parse_cdb(struct se_cmd *cmd)
 	 */
 	switch (cdb[0]) {
 	case REPORT_LUNS:
-		ret = spc_parse_cdb(cmd, &dummy_size);
-		if (ret)
-			return ret;
-		break;
+		return spc_emulate_report_luns(cmd);
 	case READ_6:
 	case READ_10:
 	case READ_12:
@@ -1020,10 +1015,8 @@ static int pscsi_parse_cdb(struct se_cmd *cmd)
 		/* FALLTHROUGH*/
 	default:
 		cmd->execute_cmd = pscsi_execute_cmd;
-		break;
+		return 0;
 	}
-
-	return 0;
 }
 
 static int pscsi_execute_cmd(struct se_cmd *cmd)

drivers/target/target_core_spc.c

@@ -908,7 +908,7 @@ static int spc_emulate_request_sense(struct se_cmd *cmd)
 	return 0;
 }
 
-static int spc_emulate_report_luns(struct se_cmd *cmd)
+int spc_emulate_report_luns(struct se_cmd *cmd)
 {
 	struct se_dev_entry *deve;
 	struct se_session *sess = cmd->se_sess;
@@ -970,6 +970,7 @@ done:
 	target_complete_cmd(cmd, GOOD);
 	return 0;
 }
+EXPORT_SYMBOL(spc_emulate_report_luns);
 
 static int spc_emulate_testunitready(struct se_cmd *cmd)
 {

include/target/target_core_backend.h

@@ -52,6 +52,7 @@ void	target_complete_cmd(struct se_cmd *, u8);
 
 int	sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops);
 int	spc_parse_cdb(struct se_cmd *cmd, unsigned int *size);
+int	spc_emulate_report_luns(struct se_cmd *cmd);
 int	spc_get_write_same_sectors(struct se_cmd *cmd);
 
 void	transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *);