QemuOpts: Drop qemu_opts_foreach() parameter abort_on_failure

When the argument is non-zero, qemu_opts_foreach() stops on callback
returning non-zero, and returns that value.

When the argument is zero, it doesn't stop, and returns the bit-wise
inclusive or of all the return values.  Funky :)

The callers that pass zero could just as well pass one, because their
callbacks can't return anything but zero:

* qemu_add_globals()'s callback qdev_add_one_global()

* qemu_config_write()'s callback config_write_opts()

* main()'s callbacks default_driver_check(), drive_enable_snapshot(),
  vnc_init_func()

Drop the parameter, and always stop.

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

block/blkdebug.c

@@ -320,7 +320,7 @@ static int read_config(BDRVBlkdebugState *s, const char *filename,
     d.s = s;
     d.action = ACTION_INJECT_ERROR;
     d.errp = &local_err;
-    qemu_opts_foreach(&inject_error_opts, add_rule, &d, 1);
+    qemu_opts_foreach(&inject_error_opts, add_rule, &d);
     if (local_err) {
         error_propagate(errp, local_err);
         ret = -EINVAL;
@@ -328,7 +328,7 @@ static int read_config(BDRVBlkdebugState *s, const char *filename,
     }
 
     d.action = ACTION_SET_STATE;
-    qemu_opts_foreach(&set_state_opts, add_rule, &d, 1);
+    qemu_opts_foreach(&set_state_opts, add_rule, &d);
     if (local_err) {
         error_propagate(errp, local_err);
         ret = -EINVAL;

hw/core/qdev-properties-system.c

@@ -404,5 +404,5 @@ static int qdev_add_one_global(QemuOpts *opts, void *opaque)
 
 void qemu_add_globals(void)
 {
-    qemu_opts_foreach(qemu_find_opts("global"), qdev_add_one_global, NULL, 0);
+    qemu_opts_foreach(qemu_find_opts("global"), qdev_add_one_global, NULL);
 }

include/qemu/option.h

@@ -126,9 +126,9 @@ QDict *qemu_opts_to_qdict(QemuOpts *opts, QDict *qdict);
 void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict, Error **errp);
 
 typedef int (*qemu_opts_loopfunc)(QemuOpts *opts, void *opaque);
+int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func,
+                      void *opaque);
 void qemu_opts_print(QemuOpts *opts, const char *sep);
-int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
-                      int abort_on_failure);
 void qemu_opts_print_help(QemuOptsList *list);
 void qemu_opts_free(QemuOptsList *list);
 QemuOptsList *qemu_opts_append(QemuOptsList *dst, QemuOptsList *list);

net/net.c

@@ -1373,10 +1373,11 @@ int net_init_clients(void)
 
     QTAILQ_INIT(&net_clients);
 
-    if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
+    if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL)) {
         return -1;
+    }
 
-    if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
+    if (qemu_opts_foreach(net, net_init_client, NULL)) {
         return -1;
     }
 

net/vhost-user.c

@@ -245,7 +245,7 @@ int net_init_vhost_user(const NetClientOptions *opts, const char *name,
 
     /* verify net frontend */
     if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net,
-                          (char *)name, true) == -1) {
+                          (char *)name)) {
         return -1;
     }
 

numa.c

@@ -216,8 +216,7 @@ void parse_numa_opts(MachineClass *mc)
 {
     int i;
 
-    if (qemu_opts_foreach(qemu_find_opts("numa"), parse_numa,
-                          NULL, 1) != 0) {
+    if (qemu_opts_foreach(qemu_find_opts("numa"), parse_numa, NULL)) {
         exit(1);
     }
 

tpm.c

@@ -207,8 +207,7 @@ void tpm_cleanup(void)
  */
 int tpm_init(void)
 {
-    if (qemu_opts_foreach(qemu_find_opts("tpmdev"),
-                          tpm_init_tpmdev, NULL, 1) != 0) {
+    if (qemu_opts_foreach(qemu_find_opts("tpmdev"), tpm_init_tpmdev, NULL)) {
         return -1;
     }
 

util/qemu-config.c

@@ -367,7 +367,7 @@ void qemu_config_write(FILE *fp)
     fprintf(fp, "# qemu config file\n\n");
     for (i = 0; lists[i] != NULL; i++) {
         data.list = lists[i];
-        qemu_opts_foreach(data.list, config_write_opts, &data, 0);
+        qemu_opts_foreach(data.list, config_write_opts, &data);
     }
 }
 

util/qemu-option.c

@@ -1046,22 +1046,29 @@ void qemu_opts_validate(QemuOpts *opts, const QemuOptDesc *desc, Error **errp)
     }
 }
 
-int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func, void *opaque,
-                      int abort_on_failure)
+/**
+ * For each member of @list, call @func(member, @opaque).
+ * Call it with the current location temporarily set to the member's.
+ * When @func() returns non-zero, break the loop and return that value.
+ * Return zero when the loop completes.
+ */
+int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func,
+                      void *opaque)
 {
     Location loc;
     QemuOpts *opts;
-    int rc = 0;
+    int rc;
 
     loc_push_none(&loc);
     QTAILQ_FOREACH(opts, &list->head, next) {
         loc_restore(&opts->loc);
-        rc |= func(opts, opaque);
-        if (abort_on_failure  &&  rc != 0)
-            break;
+        rc = func(opts, opaque);
+        if (rc) {
+            return rc;
+        }
     }
     loc_pop(&loc);
-    return rc;
+    return 0;
 }
 
 static size_t count_opts_list(QemuOptsList *list)

vl.c

@@ -3797,20 +3797,20 @@ int main(int argc, char **argv, char **envp)
         exit(1);
     }
 
-    if (qemu_opts_foreach(qemu_find_opts("sandbox"), parse_sandbox, NULL, 1)) {
+    if (qemu_opts_foreach(qemu_find_opts("sandbox"), parse_sandbox, NULL)) {
         exit(1);
     }
 
-    if (qemu_opts_foreach(qemu_find_opts("name"), parse_name, NULL, 1)) {
+    if (qemu_opts_foreach(qemu_find_opts("name"), parse_name, NULL)) {
         exit(1);
     }
 
 #ifndef _WIN32
-    if (qemu_opts_foreach(qemu_find_opts("add-fd"), parse_add_fd, NULL, 1)) {
+    if (qemu_opts_foreach(qemu_find_opts("add-fd"), parse_add_fd, NULL)) {
         exit(1);
     }
 
-    if (qemu_opts_foreach(qemu_find_opts("add-fd"), cleanup_add_fd, NULL, 1)) {
+    if (qemu_opts_foreach(qemu_find_opts("add-fd"), cleanup_add_fd, NULL)) {
         exit(1);
     }
 #endif
@@ -3897,8 +3897,8 @@ int main(int argc, char **argv, char **envp)
                                machine_class->default_machine_opts, 0);
     }
 
-    qemu_opts_foreach(qemu_find_opts("device"), default_driver_check, NULL, 0);
-    qemu_opts_foreach(qemu_find_opts("global"), default_driver_check, NULL, 0);
+    qemu_opts_foreach(qemu_find_opts("device"), default_driver_check, NULL);
+    qemu_opts_foreach(qemu_find_opts("global"), default_driver_check, NULL);
 
     if (!vga_model && !default_vga) {
         vga_interface_type = VGA_DEVICE;
@@ -4036,10 +4036,12 @@ int main(int argc, char **argv, char **envp)
 
     socket_init();
 
-    if (qemu_opts_foreach(qemu_find_opts("chardev"), chardev_init_func, NULL, 1) != 0)
+    if (qemu_opts_foreach(qemu_find_opts("chardev"), chardev_init_func, NULL)) {
         exit(1);
+    }
+
 #ifdef CONFIG_VIRTFS
-    if (qemu_opts_foreach(qemu_find_opts("fsdev"), fsdev_init_func, NULL, 1) != 0) {
+    if (qemu_opts_foreach(qemu_find_opts("fsdev"), fsdev_init_func, NULL)) {
         exit(1);
     }
 #endif
@@ -4049,13 +4051,11 @@ int main(int argc, char **argv, char **envp)
         exit(1);
     }
 
-    if (qemu_opts_foreach(qemu_find_opts("device"), device_help_func, NULL, 1)
-        != 0) {
+    if (qemu_opts_foreach(qemu_find_opts("device"), device_help_func, NULL)) {
         exit(0);
     }
 
-    if (qemu_opts_foreach(qemu_find_opts("object"),
-                          object_create, NULL, 1) != 0) {
+    if (qemu_opts_foreach(qemu_find_opts("object"), object_create, NULL)) {
         exit(1);
     }
 
@@ -4189,9 +4189,9 @@ int main(int argc, char **argv, char **envp)
 
     /* open the virtual block devices */
     if (snapshot)
-        qemu_opts_foreach(qemu_find_opts("drive"), drive_enable_snapshot, NULL, 0);
+        qemu_opts_foreach(qemu_find_opts("drive"), drive_enable_snapshot, NULL);
     if (qemu_opts_foreach(qemu_find_opts("drive"), drive_init_func,
-                          &machine_class->block_default_type, 1) != 0) {
+                          &machine_class->block_default_type)) {
         exit(1);
     }
 
@@ -4202,7 +4202,7 @@ int main(int argc, char **argv, char **envp)
 
     parse_numa_opts(machine_class);
 
-    if (qemu_opts_foreach(qemu_find_opts("mon"), mon_init_func, NULL, 1) != 0) {
+    if (qemu_opts_foreach(qemu_find_opts("mon"), mon_init_func, NULL)) {
         exit(1);
     }
 
@@ -4268,8 +4268,9 @@ int main(int argc, char **argv, char **envp)
     }
 
     /* init generic devices */
-    if (qemu_opts_foreach(qemu_find_opts("device"), device_init_func, NULL, 1) != 0)
+    if (qemu_opts_foreach(qemu_find_opts("device"), device_init_func, NULL)) {
         exit(1);
+    }
 
     /* Did we create any drives that we failed to create a device for? */
     drive_check_orphaned();
@@ -4321,7 +4322,7 @@ int main(int argc, char **argv, char **envp)
 
 #ifdef CONFIG_VNC
     /* init remote displays */
-    qemu_opts_foreach(qemu_find_opts("vnc"), vnc_init_func, NULL, 0);
+    qemu_opts_foreach(qemu_find_opts("vnc"), vnc_init_func, NULL);
     if (show_vnc_port) {
         char *ret = vnc_display_local_addr("default");
         printf("VNC server running on `%s'\n", ret);