util/filemonitor-inotify: Use QEMU_LOCK_GUARD()

Replace manual qemu_mutex_(un)lock() calls with
QEMU_LOCK_GUARD() to remove 'goto cleanup' code

Signed-off-by: Evgeny Kolmakov <randomjack94dev@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20260622073647.3721-1-randomjack94dev@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>

util/filemonitor-inotify.c

@@ -21,6 +21,7 @@
 #include "qemu/osdep.h"
 #include "qemu/filemonitor.h"
 #include "qemu/main-loop.h"
+#include "qemu/lockable.h"
 #include "qemu/error-report.h"
 #include "qapi/error.h"
 #include "trace.h"
@@ -59,10 +60,9 @@ static void qemu_file_monitor_watch(void *arg)
     int used = 0;
     int len;
 
-    qemu_mutex_lock(&mon->lock);
+    QEMU_LOCK_GUARD(&mon->lock);
 
     if (mon->fd == -1) {
-        qemu_mutex_unlock(&mon->lock);
         return;
     }
 
@@ -72,11 +72,10 @@ static void qemu_file_monitor_watch(void *arg)
         if (errno != EAGAIN) {
             error_report("Failure monitoring inotify FD '%s',"
                          "disabling events", strerror(errno));
-            goto cleanup;
         }
 
         /* no more events right now */
-        goto cleanup;
+        return;
     }
 
     /* Loop over all events in the buffer */
@@ -151,9 +150,6 @@ static void qemu_file_monitor_watch(void *arg)
             }
         }
     }
-
- cleanup:
-    qemu_mutex_unlock(&mon->lock);
 }
 
 
@@ -257,9 +253,8 @@ qemu_file_monitor_add_watch(QFileMonitor *mon,
 {
     QFileMonitorDir *dir;
     QFileMonitorWatch watch;
-    int64_t ret = -1;
 
-    qemu_mutex_lock(&mon->lock);
+    QEMU_LOCK_GUARD(&mon->lock);
     dir = g_hash_table_lookup(mon->dirs, dirpath);
     if (!dir) {
         int rv = inotify_add_watch(mon->fd, dirpath,
@@ -268,7 +263,7 @@ qemu_file_monitor_add_watch(QFileMonitor *mon,
 
         if (rv < 0) {
             error_setg_errno(errp, errno, "Unable to watch '%s'", dirpath);
-            goto cleanup;
+            return -1;
         }
 
         trace_qemu_file_monitor_enable_watch(mon, dirpath, rv);
@@ -297,11 +292,7 @@ qemu_file_monitor_add_watch(QFileMonitor *mon,
                                       filename ? filename : "<none>",
                                       cb, opaque, watch.id);
 
-    ret = watch.id;
-
- cleanup:
-    qemu_mutex_unlock(&mon->lock);
-    return ret;
+    return watch.id;
 }
 
 
@@ -312,13 +303,13 @@ void qemu_file_monitor_remove_watch(QFileMonitor *mon,
     QFileMonitorDir *dir;
     gsize i;
 
-    qemu_mutex_lock(&mon->lock);
+    QEMU_LOCK_GUARD(&mon->lock);
 
     trace_qemu_file_monitor_remove_watch(mon, dirpath, id);
 
     dir = g_hash_table_lookup(mon->dirs, dirpath);
     if (!dir) {
-        goto cleanup;
+        return;
     }
 
     for (i = 0; i < dir->watches->len; i++) {
@@ -342,7 +333,4 @@ void qemu_file_monitor_remove_watch(QFileMonitor *mon,
             qemu_set_fd_handler(mon->fd, NULL, NULL, NULL);
         }
     }
-
- cleanup:
-    qemu_mutex_unlock(&mon->lock);
 }