error: Remove NULL checks on error_propagate() calls

error_propagate() already ignores local_err==NULL, so there's no
need to check it before calling.

Coccinelle patch used to perform the changes added to
scripts/coccinelle/error_propagate_null.cocci.

Reviewed-by: Eric Blake <eblake@redhat.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <1465855078-19435-2-git-send-email-ehabkost@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

block.c

@@ -301,9 +301,7 @@ static void coroutine_fn bdrv_create_co_entry(void *opaque)
     assert(cco->drv);
 
     ret = cco->drv->bdrv_create(cco->filename, cco->opts, &local_err);
-    if (local_err) {
     error_propagate(&cco->err, local_err);
-    }
     cco->ret = ret;
 }
 
@@ -364,9 +362,7 @@ int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp)
     }
 
     ret = bdrv_create(drv, filename, opts, &local_err);
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
     return ret;
 }
 
@@ -1763,18 +1759,14 @@ fail:
     QDECREF(options);
     bs->options = NULL;
     bdrv_unref(bs);
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
     return NULL;
 
 close_and_fail:
     bdrv_unref(bs);
     QDECREF(snapshot_options);
     QDECREF(options);
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
     return NULL;
 }
 
@@ -3599,9 +3591,7 @@ void bdrv_img_create(const char *filename, const char *fmt,
 out:
     qemu_opts_del(opts);
     qemu_opts_free(create_opts);
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
 }
 
 AioContext *bdrv_get_aio_context(BlockDriverState *bs)

block/qcow2.c

@@ -2403,9 +2403,7 @@ static int qcow2_create(const char *filename, QemuOpts *opts, Error **errp)
     ret = qcow2_create2(filename, size, backing_file, backing_fmt, flags,
                         cluster_size, prealloc, opts, version, refcount_order,
                         &local_err);
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
 
 finish:
     g_free(backing_file);

block/quorum.c

@@ -971,9 +971,7 @@ close_exit:
 exit:
     qemu_opts_del(opts);
     /* propagate error */
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
     return ret;
 }
 

block/raw-posix.c

@@ -587,9 +587,7 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
 
     s->type = FTYPE_FILE;
     ret = raw_open_common(bs, options, flags, 0, &local_err);
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
     return ret;
 }
 
@@ -2236,9 +2234,7 @@ hdev_open_Mac_error:
 
     ret = raw_open_common(bs, options, flags, 0, &local_err);
     if (ret < 0) {
-        if (local_err) {
         error_propagate(errp, local_err);
-        }
 #if defined(__APPLE__) && defined(__MACH__)
         if (*bsd_path) {
             filename = bsd_path;
@@ -2450,9 +2446,7 @@ static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
 
     /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
     ret = raw_open_common(bs, options, flags, O_NONBLOCK, &local_err);
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
     return ret;
 }
 
@@ -2571,9 +2565,7 @@ static int cdrom_open(BlockDriverState *bs, QDict *options, int flags,
 
     ret = raw_open_common(bs, options, flags, 0, &local_err);
     if (ret) {
-        if (local_err) {
         error_propagate(errp, local_err);
-        }
         return ret;
     }
 

block/raw_bsd.c

@@ -194,9 +194,7 @@ static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
     int ret;
 
     ret = bdrv_create_file(filename, opts, &local_err);
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
     return ret;
 }
 

block/snapshot.c

@@ -358,9 +358,7 @@ int bdrv_snapshot_load_tmp_by_id_or_name(BlockDriverState *bs,
         ret = bdrv_snapshot_load_tmp(bs, NULL, id_or_name, &local_err);
     }
 
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
 
     return ret;
 }

blockdev.c

@@ -3644,9 +3644,7 @@ void qmp_drive_mirror(const char *device, const char *target,
                            has_unmap, unmap,
                            &local_err);
     bdrv_unref(target_bs);
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
 out:
     aio_context_release(aio_context);
 }
@@ -3701,9 +3699,7 @@ void qmp_blockdev_mirror(const char *device, const char *target,
                            has_on_target_error, on_target_error,
                            true, true,
                            &local_err);
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
 
     aio_context_release(aio_context);
 }
@@ -3913,9 +3909,7 @@ void qmp_change_backing_file(const char *device,
 
     if (ro) {
         bdrv_reopen(image_bs, open_flags, &local_err);
-        if (local_err) {
+        error_propagate(errp, local_err);
-            error_propagate(errp, local_err); /* will preserve prior errp */
-        }
     }
 
 out:

bootdevice.c

@@ -302,9 +302,7 @@ static void device_set_bootindex(Object *obj, Visitor *v, const char *name,
     add_boot_device_path(*prop->bootindex, prop->dev, prop->suffix);
 
 out:
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
 }
 
 static void property_release_bootindex(Object *obj, const char *name,

dump.c

@@ -918,9 +918,7 @@ static void write_dump_header(DumpState *s, Error **errp)
     } else {
         create_header64(s, &local_err);
     }
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
 }
 
 static size_t dump_bitmap_get_bufsize(DumpState *s)

hw/ide/qdev.c

@@ -233,9 +233,7 @@ static void ide_dev_set_bootindex(Object *obj, Visitor *v, const char *name,
                              d->unit ? "/disk@1" : "/disk@0");
     }
 out:
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
 }
 
 static void ide_dev_instance_init(Object *obj)

hw/net/ne2000-isa.c

@@ -127,9 +127,7 @@ static void isa_ne2000_set_bootindex(Object *obj, Visitor *v,
     s->c.bootindex = boot_index;
 
 out:
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
 }
 
 static void isa_ne2000_instance_init(Object *obj)

hw/s390x/virtio-ccw.c

@@ -890,9 +890,7 @@ static void virtio_ccw_net_realize(VirtioCcwDevice *ccw_dev, Error **errp)
                                   object_get_typename(OBJECT(qdev)));
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
     error_propagate(errp, err);
-    }
 }
 
 static void virtio_ccw_net_instance_init(Object *obj)
@@ -913,9 +911,7 @@ static void virtio_ccw_blk_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
     error_propagate(errp, err);
-    }
 }
 
 static void virtio_ccw_blk_instance_init(Object *obj)
@@ -950,9 +946,7 @@ static void virtio_ccw_serial_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
     error_propagate(errp, err);
-    }
 }
 
 
@@ -972,9 +966,7 @@ static void virtio_ccw_balloon_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
     error_propagate(errp, err);
-    }
 }
 
 static void virtio_ccw_balloon_instance_init(Object *obj)
@@ -1010,9 +1002,7 @@ static void virtio_ccw_scsi_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
     error_propagate(errp, err);
-    }
 }
 
 static void virtio_ccw_scsi_instance_init(Object *obj)
@@ -1034,9 +1024,7 @@ static void vhost_ccw_scsi_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
     error_propagate(errp, err);
-    }
 }
 
 static void vhost_ccw_scsi_instance_init(Object *obj)
@@ -1858,9 +1846,7 @@ static void virtio_ccw_9p_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
     object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
     error_propagate(errp, err);
-    }
 }
 
 static void virtio_ccw_9p_class_init(ObjectClass *klass, void *data)

hw/usb/dev-storage.c

@@ -818,9 +818,7 @@ static void usb_msd_set_bootindex(Object *obj, Visitor *v, const char *name,
     }
 
 out:
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
 }
 
 static const TypeInfo usb_storage_dev_type_info = {

qga/commands-win32.c

@@ -247,9 +247,7 @@ out:
     if (token) {
         CloseHandle(token);
     }
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
 }
 
 static void execute_async(DWORD WINAPI (*func)(LPVOID), LPVOID opaque,
@@ -882,9 +880,7 @@ static void check_suspend_mode(GuestSuspendMode mode, Error **errp)
     }
 
 out:
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
 }
 
 static DWORD WINAPI do_suspend(LPVOID opaque)

qom/object.c

@@ -549,9 +549,7 @@ Object *object_new_with_propv(const char *typename,
     return obj;
 
  error:
-    if (local_err) {
     error_propagate(errp, local_err);
-    }
     object_unref(obj);
     return NULL;
 }

scripts/coccinelle/error_propagate_null.cocci

@@ -0,0 +1,10 @@
+// error_propagate() already ignores local_err==NULL, so there's
+// no need to check it before calling.
+
+@@
+identifier L;
+expression E;
+@@
+-if (L) {
+     error_propagate(E, L);
+-}