target: remove obvious warnings

Get rid of a bunch of write-only variables.  In a number of cases I
suspect actual bugs to be present, so I left all of those for a second
look.

(nab: fix lio-core patch fuzz)

Signed-off-by: Joern Engel <joern@logfs.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

10 files changed, 6 insertions, 53 deletions

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index d3b54ecbfcda..b8fbc299d4ef 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1469,14 +1469,12 @@ static int iscsit_handle_nop_out(
         unsigned char *ping_data = NULL;
         int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
         u32 checksum, data_crc, padding = 0, payload_length;
-        u64 lun;
         struct iscsi_cmd *cmd = NULL;
         struct kvec *iov = NULL;
         struct iscsi_nopout *hdr;
 
         hdr                     = (struct iscsi_nopout *) buf;
         payload_length          = ntoh24(hdr->dlength);
-        lun                     = get_unaligned_le64(&hdr->lun);
         hdr->itt                = be32_to_cpu(hdr->itt);
         hdr->ttt                = be32_to_cpu(hdr->ttt);
         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
@@ -1686,13 +1684,11 @@ static int iscsit_handle_task_mgt_cmd(
         struct se_tmr_req *se_tmr;
         struct iscsi_tmr_req *tmr_req;
         struct iscsi_tm *hdr;
-        u32 payload_length;
         int out_of_order_cmdsn = 0;
         int ret;
         u8 function;
 
         hdr                     = (struct iscsi_tm *) buf;
-        payload_length          = ntoh24(hdr->dlength);
         hdr->itt                = be32_to_cpu(hdr->itt);
         hdr->rtt                = be32_to_cpu(hdr->rtt);
         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
@@ -2204,14 +2200,10 @@ static int iscsit_handle_snack(
         struct iscsi_conn *conn,
         unsigned char *buf)
 {
-        u32 unpacked_lun;
-        u64 lun;
         struct iscsi_snack *hdr;
 
         hdr                     = (struct iscsi_snack *) buf;
         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
-        lun                     = get_unaligned_le64(&hdr->lun);
-        unpacked_lun            = scsilun_to_int((struct scsi_lun *)&lun);
         hdr->itt                = be32_to_cpu(hdr->itt);
         hdr->ttt                = be32_to_cpu(hdr->ttt);
         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
@@ -3511,7 +3503,6 @@ int iscsi_target_tx_thread(void *arg)
         struct iscsi_cmd *cmd = NULL;
         struct iscsi_conn *conn;
         struct iscsi_queue_req *qr = NULL;
-        struct se_cmd *se_cmd;
         struct iscsi_thread_set *ts = arg;
         /*
          * Allow ourselves to be interrupted by SIGINT so that a
@@ -3694,8 +3685,6 @@ check_rsp_state:
                                 goto transport_err;
                         }
 
-                        se_cmd = &cmd->se_cmd;
-
                         if (map_sg && !conn->conn_ops->IFMarker) {
                                 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
                                         conn->tx_response_queue = 0;
diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index 18cffff9b456..1046b6259c8f 100644
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -882,7 +882,7 @@ fail:
 static int __iscsi_target_login_thread(struct iscsi_np *np)
 {
         u8 buffer[ISCSI_HDR_LEN], iscsi_opcode, zero_tsih = 0;
-        int err, ret = 0, ip_proto, sock_type, set_sctp_conn_flag, stop;
+        int err, ret = 0, set_sctp_conn_flag, stop;
         struct iscsi_conn *conn = NULL;
         struct iscsi_login *login;
         struct iscsi_portal_group *tpg = NULL;
@@ -895,8 +895,6 @@ static int __iscsi_target_login_thread(struct iscsi_np *np)
         flush_signals(current);
         set_sctp_conn_flag = 0;
         sock = np->np_socket;
-        ip_proto = np->np_ip_proto;
-        sock_type = np->np_sock_type;
 
         spin_lock_bh(&np->np_thread_lock);
         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
diff --git a/drivers/target/iscsi/iscsi_target_nego.c b/drivers/target/iscsi/iscsi_target_nego.c
index 37a20baa1a88..2dba448cac19 100644
--- a/drivers/target/iscsi/iscsi_target_nego.c
+++ b/drivers/target/iscsi/iscsi_target_nego.c
@@ -173,13 +173,11 @@ static int iscsi_target_check_login_request(
         struct iscsi_conn *conn,
         struct iscsi_login *login)
 {
-        int req_csg, req_nsg, rsp_csg, rsp_nsg;
+        int req_csg, req_nsg;
         u32 payload_length;
         struct iscsi_login_req *login_req;
-        struct iscsi_login_rsp *login_rsp;
 
         login_req = (struct iscsi_login_req *) login->req;
-        login_rsp = (struct iscsi_login_rsp *) login->rsp;
         payload_length = ntoh24(login_req->dlength);
 
         switch (login_req->opcode & ISCSI_OPCODE_MASK) {
@@ -203,9 +201,7 @@ static int iscsi_target_check_login_request(
         }
 
         req_csg = (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2;
-        rsp_csg = (login_rsp->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2;
         req_nsg = (login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK);
-        rsp_nsg = (login_rsp->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK);
 
         if (req_csg != login->current_stage) {
                 pr_err("Initiator unexpectedly changed login stage"
@@ -753,12 +749,10 @@ static int iscsi_target_locate_portal(
         struct iscsi_session *sess = conn->sess;
         struct iscsi_tiqn *tiqn;
         struct iscsi_login_req *login_req;
-        struct iscsi_targ_login_rsp *login_rsp;
         u32 payload_length;
         int sessiontype = 0, ret = 0;
 
         login_req = (struct iscsi_login_req *) login->req;
-        login_rsp = (struct iscsi_targ_login_rsp *) login->rsp;
         payload_length = ntoh24(login_req->dlength);
 
         login->first_request    = 1;
diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index 026dffa0ed5a..22f4fe77237b 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -1312,7 +1312,6 @@ static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
 static int tcm_loop_register_configfs(void)
 {
         struct target_fabric_configfs *fabric;
-        struct config_group *tf_cg;
         int ret;
         /*
          * Set the TCM Loop HBA counter to zero
@@ -1379,7 +1378,6 @@ static int tcm_loop_register_configfs(void)
         fabric->tf_ops.set_fabric_sense_len = &tcm_loop_set_fabric_sense_len;
         fabric->tf_ops.get_fabric_sense_len = &tcm_loop_get_fabric_sense_len;
 
-        tf_cg = &fabric->tf_group;
         /*
          * Setup function pointers for generic logic in target_core_fabric_configfs.c
          */
diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index 72bd7f5d6795..cbb66537d230 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -2853,7 +2853,6 @@ static void target_core_drop_subdev(
         struct se_subsystem_dev *se_dev = container_of(to_config_group(item),
                                 struct se_subsystem_dev, se_dev_group);
         struct se_hba *hba;
-        struct se_subsystem_api *t;
         struct config_item *df_item;
         struct config_group *dev_cg, *tg_pt_gp_cg, *dev_stat_grp;
         int i;
@@ -2861,7 +2860,6 @@ static void target_core_drop_subdev(
         hba = item_to_hba(&se_dev->se_dev_hba->hba_group.cg_item);
 
         mutex_lock(&hba->hba_access_mutex);
-        t = hba->transport;
 
         dev_stat_grp = &se_dev->dev_stat_grps.stat_group;
         for (i = 0; dev_stat_grp->default_groups[i]; i++) {
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 3be7279865b1..aa6267746383 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -647,7 +647,6 @@ int target_report_luns(struct se_task *se_task)
 {
         struct se_cmd *se_cmd = se_task->task_se_cmd;
         struct se_dev_entry *deve;
-        struct se_lun *se_lun;
         struct se_session *se_sess = se_cmd->se_sess;
         unsigned char *buf;
         u32 lun_count = 0, offset = 8, i;
@@ -672,7 +671,6 @@ int target_report_luns(struct se_task *se_task)
                 deve = se_sess->se_node_acl->device_list[i];
                 if (!(deve->lun_flags & TRANSPORT_LUNFLAGS_INITIATOR_ACCESS))
                         continue;
-                se_lun = deve->se_lun;
                 /*
                  * We determine the correct LUN LIST LENGTH even once we
                  * have reached the initial allocation length.
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index de3e4f2f60bd..5926b171dba0 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -2416,9 +2416,7 @@ static int core_scsi3_pro_reserve(
         u64 res_key)
 {
         struct se_session *se_sess = cmd->se_sess;
-        struct se_dev_entry *se_deve;
         struct se_lun *se_lun = cmd->se_lun;
-        struct se_portal_group *se_tpg;
         struct t10_pr_registration *pr_reg, *pr_res_holder;
         struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
         char i_buf[PR_REG_ISID_ID_LEN];
@@ -2431,8 +2429,6 @@ static int core_scsi3_pro_reserve(
                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
                 return -EINVAL;
         }
-        se_tpg = se_sess->se_tpg;
-        se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
         /*
          * Locate the existing *pr_reg via struct se_node_acl pointers
          */
@@ -2990,7 +2986,6 @@ static int core_scsi3_pro_preempt(
         int abort)
 {
         struct se_device *dev = cmd->se_dev;
-        struct se_dev_entry *se_deve;
         struct se_node_acl *pr_reg_nacl;
         struct se_session *se_sess = cmd->se_sess;
         LIST_HEAD(preempt_and_abort_list);
@@ -3005,7 +3000,6 @@ static int core_scsi3_pro_preempt(
                 return -EINVAL;
         }
 
-        se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
         pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
                                 se_sess);
         if (!pr_reg_n) {
@@ -3341,7 +3335,7 @@ static int core_scsi3_emulate_pro_register_and_move(
 {
         struct se_session *se_sess = cmd->se_sess;
         struct se_device *dev = cmd->se_dev;
-        struct se_dev_entry *se_deve, *dest_se_deve = NULL;
+        struct se_dev_entry *dest_se_deve = NULL;
         struct se_lun *se_lun = cmd->se_lun;
         struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
         struct se_port *se_port;
@@ -3366,7 +3360,6 @@ static int core_scsi3_emulate_pro_register_and_move(
         memset(i_buf, 0, PR_REG_ISID_ID_LEN);
         se_tpg = se_sess->se_tpg;
         tf_ops = se_tpg->se_tpg_tfo;
-        se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
         /*
          * Follow logic from spc4r17 Section 5.7.8, Table 50 --
          *      Register behaviors for a REGISTER AND MOVE service action
diff --git a/drivers/target/target_core_stat.c b/drivers/target/target_core_stat.c
index 7ce1bfa5c542..3d44beb0cf1f 100644
--- a/drivers/target/target_core_stat.c
+++ b/drivers/target/target_core_stat.c
@@ -954,7 +954,6 @@ static ssize_t target_stat_scsi_tgt_port_show_attr_in_cmds(
 {
         struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
         struct se_port *sep;
-        struct se_portal_group *tpg;
         ssize_t ret;
 
         spin_lock(&lun->lun_sep_lock);
@@ -963,7 +962,6 @@ static ssize_t target_stat_scsi_tgt_port_show_attr_in_cmds(
                 spin_unlock(&lun->lun_sep_lock);
                 return -ENODEV;
         }
-        tpg = sep->sep_tpg;
 
         ret = snprintf(page, PAGE_SIZE, "%llu\n", sep->sep_stats.cmd_pdus);
         spin_unlock(&lun->lun_sep_lock);
@@ -976,7 +974,6 @@ static ssize_t target_stat_scsi_tgt_port_show_attr_write_mbytes(
 {
         struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
         struct se_port *sep;
-        struct se_portal_group *tpg;
         ssize_t ret;
 
         spin_lock(&lun->lun_sep_lock);
@@ -985,7 +982,6 @@ static ssize_t target_stat_scsi_tgt_port_show_attr_write_mbytes(
                 spin_unlock(&lun->lun_sep_lock);
                 return -ENODEV;
         }
-        tpg = sep->sep_tpg;
 
         ret = snprintf(page, PAGE_SIZE, "%u\n",
                         (u32)(sep->sep_stats.rx_data_octets >> 20));
@@ -999,7 +995,6 @@ static ssize_t target_stat_scsi_tgt_port_show_attr_read_mbytes(
 {
         struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
         struct se_port *sep;
-        struct se_portal_group *tpg;
         ssize_t ret;
 
         spin_lock(&lun->lun_sep_lock);
@@ -1008,7 +1003,6 @@ static ssize_t target_stat_scsi_tgt_port_show_attr_read_mbytes(
                 spin_unlock(&lun->lun_sep_lock);
                 return -ENODEV;
         }
-        tpg = sep->sep_tpg;
 
         ret = snprintf(page, PAGE_SIZE, "%u\n",
                         (u32)(sep->sep_stats.tx_data_octets >> 20));
@@ -1022,7 +1016,6 @@ static ssize_t target_stat_scsi_tgt_port_show_attr_hs_in_cmds(
 {
         struct se_lun *lun = container_of(pgrps, struct se_lun, port_stat_grps);
         struct se_port *sep;
-        struct se_portal_group *tpg;
         ssize_t ret;
 
         spin_lock(&lun->lun_sep_lock);
@@ -1031,7 +1024,6 @@ static ssize_t target_stat_scsi_tgt_port_show_attr_hs_in_cmds(
                 spin_unlock(&lun->lun_sep_lock);
                 return -ENODEV;
         }
-        tpg = sep->sep_tpg;
 
         /* FIXME: scsiTgtPortHsInCommands */
         ret = snprintf(page, PAGE_SIZE, "%u\n", 0);
@@ -1275,7 +1267,6 @@ static ssize_t target_stat_scsi_auth_intr_show_attr_dev(
         struct se_node_acl *nacl = lacl->se_lun_nacl;
         struct se_dev_entry *deve;
         struct se_lun *lun;
-        struct se_portal_group *tpg;
         ssize_t ret;
 
         spin_lock_irq(&nacl->device_list_lock);
@@ -1284,7 +1275,6 @@ static ssize_t target_stat_scsi_auth_intr_show_attr_dev(
                 spin_unlock_irq(&nacl->device_list_lock);
                 return -ENODEV;
         }
-        tpg = nacl->se_tpg;
         lun = deve->se_lun;
         /* scsiDeviceIndex */
         ret = snprintf(page, PAGE_SIZE, "%u\n", lun->lun_se_dev->dev_index);
@@ -1643,7 +1633,6 @@ static ssize_t target_stat_scsi_att_intr_port_show_attr_dev(
         struct se_node_acl *nacl = lacl->se_lun_nacl;
         struct se_dev_entry *deve;
         struct se_lun *lun;
-        struct se_portal_group *tpg;
         ssize_t ret;
 
         spin_lock_irq(&nacl->device_list_lock);
@@ -1652,7 +1641,6 @@ static ssize_t target_stat_scsi_att_intr_port_show_attr_dev(
                 spin_unlock_irq(&nacl->device_list_lock);
                 return -ENODEV;
         }
-        tpg = nacl->se_tpg;
         lun = deve->se_lun;
         /* scsiDeviceIndex */
         ret = snprintf(page, PAGE_SIZE, "%u\n", lun->lun_se_dev->dev_index);
diff --git a/drivers/target/target_core_tpg.c b/drivers/target/target_core_tpg.c
index c0fecde02fd0..70c3ffb981e7 100644
--- a/drivers/target/target_core_tpg.c
+++ b/drivers/target/target_core_tpg.c
@@ -359,7 +359,7 @@ void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
 
 void core_tpg_clear_object_luns(struct se_portal_group *tpg)
 {
-        int i, ret;
+        int i;
         struct se_lun *lun;
 
         spin_lock(&tpg->tpg_lun_lock);
@@ -371,7 +371,7 @@ void core_tpg_clear_object_luns(struct se_portal_group *tpg)
                         continue;
 
                 spin_unlock(&tpg->tpg_lun_lock);
-                ret = core_dev_del_lun(tpg, lun->unpacked_lun);
+                core_dev_del_lun(tpg, lun->unpacked_lun);
                 spin_lock(&tpg->tpg_lun_lock);
         }
         spin_unlock(&tpg->tpg_lun_lock);
@@ -483,12 +483,11 @@ int core_tpg_del_initiator_node_acl(
         LIST_HEAD(sess_list);
         struct se_session *sess, *sess_tmp;
         unsigned long flags;
-        int dynamic_acl = 0, rc;
+        int rc;
 
         spin_lock_irq(&tpg->acl_node_lock);
         if (acl->dynamic_node_acl) {
                 acl->dynamic_node_acl = 0;
-                dynamic_acl = 1;
         }
         list_del(&acl->acl_list);
         tpg->num_node_acls--;
diff --git a/drivers/target/tcm_fc/tfc_sess.c b/drivers/target/tcm_fc/tfc_sess.c
index a1d1f3c86447..b30f92bdc1a4 100644
--- a/drivers/target/tcm_fc/tfc_sess.c
+++ b/drivers/target/tcm_fc/tfc_sess.c
@@ -319,11 +319,9 @@ int ft_sess_shutdown(struct se_session *se_sess)
 void ft_sess_close(struct se_session *se_sess)
 {
         struct ft_sess *sess = se_sess->fabric_sess_ptr;
-        struct fc_lport *lport;
         u32 port_id;
 
         mutex_lock(&ft_lport_lock);
-        lport = sess->tport->lport;
         port_id = sess->port_id;
         if (port_id == -1) {
                 mutex_unlock(&ft_lport_lock);