dm: push error reporting down to dm_register_target()

Simplifies each DM target's init method by making dm_register_target()
responsible for its error reporting (on behalf of targets).

Signed-off-by: Yangtao Li <frank.li@vivo.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

Author: bbkzz

drivers/md/dm-cache-target.c

@@ -3459,7 +3459,6 @@ static int __init dm_cache_init(void)
 
 	r = dm_register_target(&cache_target);
 	if (r) {
-		DMERR("cache target registration failed: %d", r);
 		kmem_cache_destroy(migration_cache);
 		return r;
 	}

drivers/md/dm-clone-target.c

@@ -2204,7 +2204,6 @@ static int __init dm_clone_init(void)
 
 	r = dm_register_target(&clone_target);
 	if (r < 0) {
-		DMERR("Failed to register clone target");
 		kmem_cache_destroy(_hydration_cache);
 		return r;
 	}

drivers/md/dm-crypt.c

@@ -3662,13 +3662,7 @@ static struct target_type crypt_target = {
 
 static int __init dm_crypt_init(void)
 {
-	int r;
-
-	r = dm_register_target(&crypt_target);
-	if (r < 0)
-		DMERR("register failed %d", r);
-
-	return r;
+	return dm_register_target(&crypt_target);
 }
 
 static void __exit dm_crypt_exit(void)

drivers/md/dm-delay.c

@@ -370,18 +370,7 @@ static struct target_type delay_target = {
 
 static int __init dm_delay_init(void)
 {
-	int r;
-
-	r = dm_register_target(&delay_target);
-	if (r < 0) {
-		DMERR("register failed %d", r);
-		goto bad_register;
-	}
-
-	return 0;
-
-bad_register:
-	return r;
+	return dm_register_target(&delay_target);
 }
 
 static void __exit dm_delay_exit(void)

drivers/md/dm-dust.c

@@ -573,12 +573,7 @@ static struct target_type dust_target = {
 
 static int __init dm_dust_init(void)
 {
-	int r = dm_register_target(&dust_target);
-
-	if (r < 0)
-		DMERR("dm_register_target failed %d", r);
-
-	return r;
+	return dm_register_target(&dust_target);
 }
 
 static void __exit dm_dust_exit(void)

drivers/md/dm-ebs-target.c

@@ -455,12 +455,7 @@ static struct target_type ebs_target = {
 
 static int __init dm_ebs_init(void)
 {
-	int r = dm_register_target(&ebs_target);
-
-	if (r < 0)
-		DMERR("register failed %d", r);
-
-	return r;
+	return dm_register_target(&ebs_target);
 }
 
 static void dm_ebs_exit(void)

drivers/md/dm-era-target.c

@@ -1756,15 +1756,7 @@ static struct target_type era_target = {
 
 static int __init dm_era_init(void)
 {
-	int r;
-
-	r = dm_register_target(&era_target);
-	if (r) {
-		DMERR("era target registration failed: %d", r);
-		return r;
-	}
-
-	return 0;
+	return dm_register_target(&era_target);
 }
 
 static void __exit dm_era_exit(void)

drivers/md/dm-flakey.c

@@ -509,12 +509,7 @@ static struct target_type flakey_target = {
 
 static int __init dm_flakey_init(void)
 {
-	int r = dm_register_target(&flakey_target);
-
-	if (r < 0)
-		DMERR("register failed %d", r);
-
-	return r;
+	return dm_register_target(&flakey_target);
 }
 
 static void __exit dm_flakey_exit(void)

drivers/md/dm-integrity.c

@@ -4704,7 +4704,6 @@ static int __init dm_integrity_init(void)
 
 	r = dm_register_target(&integrity_target);
 	if (r < 0) {
-		DMERR("register failed %d", r);
 		kmem_cache_destroy(journal_io_cache);
 		return r;
 	}

drivers/md/dm-log-writes.c

@@ -940,12 +940,7 @@ static struct target_type log_writes_target = {
 
 static int __init dm_log_writes_init(void)
 {
-	int r = dm_register_target(&log_writes_target);
-
-	if (r < 0)
-		DMERR("register failed %d", r);
-
-	return r;
+	return dm_register_target(&log_writes_target);
 }
 
 static void __exit dm_log_writes_exit(void)