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

Web:        https://git.kernel.org/torvalds/c/094bb5d766cfcdae47e332c6d6713c7029241be1
Commit:     094bb5d766cfcdae47e332c6d6713c7029241be1
Parent:     30a7acd573899fd8b8ac39236eff6468b195ac7d
Refname:    refs/heads/master
Author:     Rasmus Villemoes <[email protected]>
AuthorDate: Tue Nov 21 01:12:43 2017 +0100
Committer:  Nicholas Bellinger <[email protected]>
CommitDate: Fri Jan 12 15:07:09 2018 -0800

    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 <[email protected]>
    Signed-off-by: Nicholas Bellinger <[email protected]>
---
 drivers/target/target_core_fabric_lib.c | 6 +++---
 drivers/target/target_core_internal.h   | 2 +-
 drivers/target/target_core_pr.c         | 4 ++--
 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");
--
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