target-core: don't use "const char*" for a buffer that is written to

iscsi_parse_pr_out_transport_id launders the const away via a call to
strstr(), and then modifies the buffer (writing a nul byte) through
the return value. It's cleaner to be honest and simply declare the
parameter as "char*", fixing up the call chain, and allowing us to
drop the cast in the return statement.

Amusingly, the two current callers found it necessary to cast a
non-const pointer to a const.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

3 files changed, 6 insertions, 6 deletions

diff --git a/drivers/target/target_core_fabric_lib.c b/drivers/target/target_core_fabric_lib.c
index 508da345b73f..71a80257a052 100644
--- a/drivers/target/target_core_fabric_lib.c
+++ b/drivers/target/target_core_fabric_lib.c
@@ -273,7 +273,7 @@ static int iscsi_get_pr_transport_id_len(
 
 static char *iscsi_parse_pr_out_transport_id(
         struct se_portal_group *se_tpg,
-        const char *buf,
+        char *buf,
         u32 *out_tid_len,
         char **port_nexus_ptr)
 {
@@ -356,7 +356,7 @@ static char *iscsi_parse_pr_out_transport_id(
                 }
         }
 
-        return (char *)&buf[4];
+        return &buf[4];
 }
 
 int target_get_pr_transport_id_len(struct se_node_acl *nacl,
@@ -405,7 +405,7 @@ int target_get_pr_transport_id(struct se_node_acl *nacl,
 }
 
 const char *target_parse_pr_out_transport_id(struct se_portal_group *tpg,
-                const char *buf, u32 *out_tid_len, char **port_nexus_ptr)
+                char *buf, u32 *out_tid_len, char **port_nexus_ptr)
 {
         u32 offset;
 
diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h
index 9384d19a7326..6d53d9fcb883 100644
--- a/drivers/target/target_core_internal.h
+++ b/drivers/target/target_core_internal.h
@@ -102,7 +102,7 @@ int	target_get_pr_transport_id(struct se_node_acl *nacl,
                 struct t10_pr_registration *pr_reg, int *format_code,
                 unsigned char *buf);
 const char *target_parse_pr_out_transport_id(struct se_portal_group *tpg,
-                const char *buf, u32 *out_tid_len, char **port_nexus_ptr);
+                char *buf, u32 *out_tid_len, char **port_nexus_ptr);
 
 /* target_core_hba.c */
 struct se_hba *core_alloc_hba(const char *, u32, u32);
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index b024613f9217..01ac306131c1 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -1601,7 +1601,7 @@ core_scsi3_decode_spec_i_port(
                         dest_rtpi = tmp_lun->lun_rtpi;
 
                         i_str = target_parse_pr_out_transport_id(tmp_tpg,
-                                        (const char *)ptr, &tid_len, &iport_ptr);
+                                        ptr, &tid_len, &iport_ptr);
                         if (!i_str)
                                 continue;
 
@@ -3287,7 +3287,7 @@ core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
                 goto out;
         }
         initiator_str = target_parse_pr_out_transport_id(dest_se_tpg,
-                        (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
+                        &buf[24], &tmp_tid_len, &iport_ptr);
         if (!initiator_str) {
                 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
                         " initiator_str from Transport ID\n");