Leave migration_ioc_process_incoming to do only the channel
identification process and move the migration start into
channel.c. Both routines will be renamed in the next patches to better
reflect their usage.

Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Prasad Pandit <pjp@fedoraproject.org>
Link: https://lore.kernel.org/qemu-devel/20260123141656.6765-16-farosas@suse.de
Signed-off-by: Fabiano Rosas <farosas@suse.de>
---
 migration/channel.c   | 12 ++++++++++--
 migration/channel.h   |  5 +++--
 migration/migration.c | 13 +++++--------
 migration/migration.h |  3 ++-
 4 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/migration/channel.c b/migration/channel.c
index 6acce7b2a2..b8d757c17b 100644
--- a/migration/channel.c
+++ b/migration/channel.c
@@ -33,6 +33,7 @@ void migration_channel_process_incoming(QIOChannel *ioc)
 {
     MigrationIncomingState *mis = migration_incoming_get_current();
     Error *local_err = NULL;
+    MigChannelType ch;
 
     trace_migration_set_incoming_channel(
         ioc, object_get_typename(OBJECT(ioc)));
@@ -41,9 +42,16 @@ void migration_channel_process_incoming(QIOChannel *ioc)
         migration_tls_channel_process_incoming(ioc, &local_err);
     } else {
         migration_ioc_register_yank(ioc);
-        migration_ioc_process_incoming(ioc, &local_err);
-    }
+        ch = migration_ioc_process_incoming(ioc, &local_err);
+        if (!ch) {
+            goto out;
+        }
 
+        if (migration_incoming_setup(ioc, ch, &local_err)) {
+            migration_incoming_process();
+        }
+    }
+out:
     if (local_err) {
         error_report_err(local_err);
         migrate_set_state(&mis->state, mis->state, MIGRATION_STATUS_FAILED);
diff --git a/migration/channel.h b/migration/channel.h
index 93dedbf52b..b361e1c838 100644
--- a/migration/channel.h
+++ b/migration/channel.h
@@ -19,11 +19,12 @@
 #include "io/channel.h"
 
 /* Migration channel types */
-enum {
+typedef enum {
+    CH_NONE,
     CH_MAIN,
     CH_MULTIFD,
     CH_POSTCOPY
-};
+} MigChannelType;
 
 void migration_channel_process_incoming(QIOChannel *ioc);
 
diff --git a/migration/migration.c b/migration/migration.c
index 93ebed5f8e..8a27d93498 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1037,10 +1037,10 @@ static bool migration_has_main_and_multifd_channels(void)
     return true;
 }
 
-void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp)
+MigChannelType migration_ioc_process_incoming(QIOChannel *ioc, Error **errp)
 {
     MigrationIncomingState *mis = migration_incoming_get_current();
-    uint8_t channel;
+    MigChannelType channel = CH_NONE;
     uint32_t channel_magic = 0;
     int ret = 0;
 
@@ -1059,7 +1059,7 @@ void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp)
             ret = migration_channel_read_peek(ioc, (void *)&channel_magic,
                                               sizeof(channel_magic), errp);
             if (ret != 0) {
-                return;
+                goto out;
             }
 
             channel_magic = be32_to_cpu(channel_magic);
@@ -1074,7 +1074,6 @@ void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp)
                 channel = CH_MAIN;
             } else {
                 error_setg(errp, "unknown channel magic: %u", channel_magic);
-                return;
             }
         } else if (mis->from_src_file && migrate_multifd()) {
             /*
@@ -1086,16 +1085,14 @@ void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp)
             channel = CH_MAIN;
         } else {
             error_setg(errp, "non-peekable channel used without multifd");
-            return;
         }
     } else {
         assert(migrate_postcopy_preempt());
         channel = CH_POSTCOPY;
     }
 
-    if (migration_incoming_setup(ioc, channel, errp)) {
-        migration_incoming_process();
-    }
+out:
+    return channel;
 }
 
 /**
diff --git a/migration/migration.h b/migration/migration.h
index cd6cfd62ba..b55cc40613 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -28,6 +28,7 @@
 #include "postcopy-ram.h"
 #include "system/runstate.h"
 #include "migration/misc.h"
+#include "channel.h"
 
 #define  MIGRATION_THREAD_SNAPSHOT          "mig/snapshot"
 #define  MIGRATION_THREAD_DIRTY_RATE        "mig/dirtyrate"
@@ -527,7 +528,7 @@ struct MigrationState {
 void migrate_set_state(MigrationStatus *state, MigrationStatus old_state,
                        MigrationStatus new_state);
 
-void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp);
+MigChannelType migration_ioc_process_incoming(QIOChannel *ioc, Error **errp);
 void migration_incoming_process(void);
 bool migration_incoming_setup(QIOChannel *ioc, uint8_t channel, Error **errp);
 void migration_outgoing_setup(QIOChannel *ioc);
-- 
2.51.0