monitor: Clean up around monitor_handle_fd_param()

monitor_handle_fd_param() is a wrapper around
monitor_handle_fd_param2() that feeds errors to qerror_report_err()
instead of returning them.  qerror_report_err() is inappropriate in
many contexts.  monitor_handle_fd_param() looks simpler than
monitor_handle_fd_param2(), which tempts use.  Remove the temptation:
drop the wrapper and open-code the (trivial) error handling instead.

Replace the open-coded qerror_report_err() by error_report_err() in
places that already use error_report().  Turns out that's everywhere.

While there, rename monitor_handle_fd_param2() to monitor_fd_param().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

hw/i386/kvm/pci-assign.c

@@ -552,9 +552,8 @@ static void get_real_device(AssignedDevice *pci_dev, Error **errp)
     snprintf(name, sizeof(name), "%sconfig", dir);
 
     if (pci_dev->configfd_name && *pci_dev->configfd_name) {
-        dev->config_fd = monitor_handle_fd_param2(cur_mon,
-                                                  pci_dev->configfd_name,
-                                                  &local_err);
+        dev->config_fd = monitor_fd_param(cur_mon, pci_dev->configfd_name,
+                                          &local_err);
         if (local_err) {
             error_propagate(errp, local_err);
             return;

hw/scsi/vhost-scsi.c

@@ -214,7 +214,7 @@ static void vhost_scsi_realize(DeviceState *dev, Error **errp)
     }
 
     if (vs->conf.vhostfd) {
-        vhostfd = monitor_handle_fd_param2(cur_mon, vs->conf.vhostfd, &err);
+        vhostfd = monitor_fd_param(cur_mon, vs->conf.vhostfd, &err);
         if (vhostfd == -1) {
             error_setg(errp, "vhost-scsi: unable to parse vhostfd: %s",
                        error_get_pretty(err));

include/monitor/monitor.h

@@ -34,8 +34,7 @@ int monitor_read_block_device_key(Monitor *mon, const char *device,
                                   void *opaque);
 
 int monitor_get_fd(Monitor *mon, const char *fdname, Error **errp);
-int monitor_handle_fd_param(Monitor *mon, const char *fdname);
-int monitor_handle_fd_param2(Monitor *mon, const char *fdname, Error **errp);
+int monitor_fd_param(Monitor *mon, const char *fdname, Error **errp);
 
 void monitor_vprintf(Monitor *mon, const char *fmt, va_list ap)
     GCC_FMT_ATTR(2, 0);

monitor.c

@@ -2570,20 +2570,7 @@ void monitor_fdset_dup_fd_remove(int dup_fd)
     monitor_fdset_dup_fd_find_remove(dup_fd, true);
 }
 
-int monitor_handle_fd_param(Monitor *mon, const char *fdname)
-{
-    int fd;
-    Error *local_err = NULL;
-
-    fd = monitor_handle_fd_param2(mon, fdname, &local_err);
-    if (local_err) {
-        qerror_report_err(local_err);
-        error_free(local_err);
-    }
-    return fd;
-}
-
-int monitor_handle_fd_param2(Monitor *mon, const char *fdname, Error **errp)
+int monitor_fd_param(Monitor *mon, const char *fdname, Error **errp)
 {
     int fd;
     Error *local_err = NULL;

net/socket.c

@@ -695,6 +695,7 @@ static int net_socket_udp_init(NetClientState *peer,
 int net_init_socket(const NetClientOptions *opts, const char *name,
                     NetClientState *peer)
 {
+    Error *err = NULL;
     const NetdevSocketOptions *sock;
 
     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_SOCKET);
@@ -715,8 +716,9 @@ int net_init_socket(const NetClientOptions *opts, const char *name,
     if (sock->has_fd) {
         int fd;
 
-        fd = monitor_handle_fd_param(cur_mon, sock->fd);
+        fd = monitor_fd_param(cur_mon, sock->fd, &err);
         if (fd == -1) {
+            error_report_err(err);
             return -1;
         }
         qemu_set_nonblock(fd);

net/tap.c

@@ -605,6 +605,7 @@ static int net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
                             const char *downscript, const char *vhostfdname,
                             int vnet_hdr, int fd)
 {
+    Error *err = NULL;
     TAPState *s;
     int vhostfd;
 
@@ -643,8 +644,9 @@ static int net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
         options.force = tap->has_vhostforce && tap->vhostforce;
 
         if (tap->has_vhostfd || tap->has_vhostfds) {
-            vhostfd = monitor_handle_fd_param(cur_mon, vhostfdname);
+            vhostfd = monitor_fd_param(cur_mon, vhostfdname, &err);
             if (vhostfd == -1) {
+                error_report_err(err);
                 return -1;
             }
         } else {
@@ -704,6 +706,7 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
     /* for the no-fd, no-helper case */
     const char *script = NULL; /* suppress wrong "uninit'd use" gcc warning */
     const char *downscript = NULL;
+    Error *err = NULL;
     const char *vhostfdname;
     char ifname[128];
 
@@ -729,8 +732,9 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
             return -1;
         }
 
-        fd = monitor_handle_fd_param(cur_mon, tap->fd);
+        fd = monitor_fd_param(cur_mon, tap->fd, &err);
         if (fd == -1) {
+            error_report_err(err);
             return -1;
         }
 
@@ -768,8 +772,9 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
         }
 
         for (i = 0; i < nfds; i++) {
-            fd = monitor_handle_fd_param(cur_mon, fds[i]);
+            fd = monitor_fd_param(cur_mon, fds[i], &err);
             if (fd == -1) {
+                error_report_err(err);
                 return -1;
             }