| Message ID | 20190507163416.24647-14-philmd@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | hw: Use object_initialize_child for correct reference counting | expand |
On 07/05/19 11:34, Philippe Mathieu-Daudé wrote: > As explained in commit aff39be0ed97: > > Both functions, object_initialize() and object_property_add_child() > increase the reference counter of the new object, so one of the > references has to be dropped afterwards to get the reference > counting right. Otherwise the child object will not be properly > cleaned up when the parent gets destroyed. > Thus let's use now object_initialize_child() instead to get the > reference counting here right. > > This patch was generated using the following Coccinelle script > (then manually modified to use numbered IPI name) > > @use_sysbus_init_child_obj_missing_parent@ > expression child_ptr; > expression child_type; > expression child_size; > @@ > - object_initialize(child_ptr, child_size, child_type); > ... > - qdev_set_parent_bus(DEVICE(child_ptr), sysbus_get_default()); > ... > ?- object_unref(OBJECT(child_ptr)); > + sysbus_init_child_obj(OBJECT(PARENT_OBJ), "CHILD_NAME", child_ptr, > + child_size, child_type); > > We let the SoC adopt the IPI children. > > While the object_initialize() function doesn't take an > 'Error *errp' argument, the object_initialize_child() does. > Since this code is used when a machine is created (and is not > yet running), we deliberately choose to use the &error_abort > argument instead of ignoring errors if an object creation failed. > This choice also matches when using sysbus_init_child_obj(), > since its code is: > > void sysbus_init_child_obj(Object *parent, > const char *childname, void *child, > size_t childsize, const char *childtype) > { > object_initialize_child(parent, childname, child, childsize, > childtype, &error_abort, NULL); > > qdev_set_parent_bus(DEVICE(child), sysbus_get_default()); > } > > Suggested-by: Eduardo Habkost <ehabkost@redhat.com> > Inspired-by: Thomas Huth <thuth@redhat.com> > Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> > --- > hw/microblaze/xlnx-zynqmp-pmu.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/hw/microblaze/xlnx-zynqmp-pmu.c b/hw/microblaze/xlnx-zynqmp-pmu.c > index 20e973edf5f..0948b1fd5f2 100644 > --- a/hw/microblaze/xlnx-zynqmp-pmu.c > +++ b/hw/microblaze/xlnx-zynqmp-pmu.c > @@ -71,9 +71,10 @@ static void xlnx_zynqmp_pmu_soc_init(Object *obj) > > /* Create the IPI device */ > for (int i = 0; i < XLNX_ZYNQMP_PMU_NUM_IPIS; i++) { > - object_initialize(&s->ipi[i], sizeof(XlnxZynqMPIPI), > - TYPE_XLNX_ZYNQMP_IPI); > - qdev_set_parent_bus(DEVICE(&s->ipi[i]), sysbus_get_default()); > + char *name = g_strdup_printf("ipi%d", i); > + sysbus_init_child_obj(obj, name, &s->ipi[i], > + sizeof(XlnxZynqMPIPI), TYPE_XLNX_ZYNQMP_IPI); > + g_free(name); > } > } > > Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
On Tue, May 7, 2019 at 9:46 AM Philippe Mathieu-Daudé <philmd@redhat.com> wrote: > > As explained in commit aff39be0ed97: > > Both functions, object_initialize() and object_property_add_child() > increase the reference counter of the new object, so one of the > references has to be dropped afterwards to get the reference > counting right. Otherwise the child object will not be properly > cleaned up when the parent gets destroyed. > Thus let's use now object_initialize_child() instead to get the > reference counting here right. > > This patch was generated using the following Coccinelle script > (then manually modified to use numbered IPI name) > > @use_sysbus_init_child_obj_missing_parent@ > expression child_ptr; > expression child_type; > expression child_size; > @@ > - object_initialize(child_ptr, child_size, child_type); > ... > - qdev_set_parent_bus(DEVICE(child_ptr), sysbus_get_default()); > ... > ?- object_unref(OBJECT(child_ptr)); > + sysbus_init_child_obj(OBJECT(PARENT_OBJ), "CHILD_NAME", child_ptr, > + child_size, child_type); > > We let the SoC adopt the IPI children. > > While the object_initialize() function doesn't take an > 'Error *errp' argument, the object_initialize_child() does. > Since this code is used when a machine is created (and is not > yet running), we deliberately choose to use the &error_abort > argument instead of ignoring errors if an object creation failed. > This choice also matches when using sysbus_init_child_obj(), > since its code is: > > void sysbus_init_child_obj(Object *parent, > const char *childname, void *child, > size_t childsize, const char *childtype) > { > object_initialize_child(parent, childname, child, childsize, > childtype, &error_abort, NULL); > > qdev_set_parent_bus(DEVICE(child), sysbus_get_default()); > } > > Suggested-by: Eduardo Habkost <ehabkost@redhat.com> > Inspired-by: Thomas Huth <thuth@redhat.com> > Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Alistair > --- > hw/microblaze/xlnx-zynqmp-pmu.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/hw/microblaze/xlnx-zynqmp-pmu.c b/hw/microblaze/xlnx-zynqmp-pmu.c > index 20e973edf5f..0948b1fd5f2 100644 > --- a/hw/microblaze/xlnx-zynqmp-pmu.c > +++ b/hw/microblaze/xlnx-zynqmp-pmu.c > @@ -71,9 +71,10 @@ static void xlnx_zynqmp_pmu_soc_init(Object *obj) > > /* Create the IPI device */ > for (int i = 0; i < XLNX_ZYNQMP_PMU_NUM_IPIS; i++) { > - object_initialize(&s->ipi[i], sizeof(XlnxZynqMPIPI), > - TYPE_XLNX_ZYNQMP_IPI); > - qdev_set_parent_bus(DEVICE(&s->ipi[i]), sysbus_get_default()); > + char *name = g_strdup_printf("ipi%d", i); > + sysbus_init_child_obj(obj, name, &s->ipi[i], > + sizeof(XlnxZynqMPIPI), TYPE_XLNX_ZYNQMP_IPI); > + g_free(name); > } > } > > -- > 2.20.1 > >
diff --git a/hw/microblaze/xlnx-zynqmp-pmu.c b/hw/microblaze/xlnx-zynqmp-pmu.c index 20e973edf5f..0948b1fd5f2 100644 --- a/hw/microblaze/xlnx-zynqmp-pmu.c +++ b/hw/microblaze/xlnx-zynqmp-pmu.c @@ -71,9 +71,10 @@ static void xlnx_zynqmp_pmu_soc_init(Object *obj) /* Create the IPI device */ for (int i = 0; i < XLNX_ZYNQMP_PMU_NUM_IPIS; i++) { - object_initialize(&s->ipi[i], sizeof(XlnxZynqMPIPI), - TYPE_XLNX_ZYNQMP_IPI); - qdev_set_parent_bus(DEVICE(&s->ipi[i]), sysbus_get_default()); + char *name = g_strdup_printf("ipi%d", i); + sysbus_init_child_obj(obj, name, &s->ipi[i], + sizeof(XlnxZynqMPIPI), TYPE_XLNX_ZYNQMP_IPI); + g_free(name); } }
As explained in commit aff39be0ed97: Both functions, object_initialize() and object_property_add_child() increase the reference counter of the new object, so one of the references has to be dropped afterwards to get the reference counting right. Otherwise the child object will not be properly cleaned up when the parent gets destroyed. Thus let's use now object_initialize_child() instead to get the reference counting here right. This patch was generated using the following Coccinelle script (then manually modified to use numbered IPI name) @use_sysbus_init_child_obj_missing_parent@ expression child_ptr; expression child_type; expression child_size; @@ - object_initialize(child_ptr, child_size, child_type); ... - qdev_set_parent_bus(DEVICE(child_ptr), sysbus_get_default()); ... ?- object_unref(OBJECT(child_ptr)); + sysbus_init_child_obj(OBJECT(PARENT_OBJ), "CHILD_NAME", child_ptr, + child_size, child_type); We let the SoC adopt the IPI children. While the object_initialize() function doesn't take an 'Error *errp' argument, the object_initialize_child() does. Since this code is used when a machine is created (and is not yet running), we deliberately choose to use the &error_abort argument instead of ignoring errors if an object creation failed. This choice also matches when using sysbus_init_child_obj(), since its code is: void sysbus_init_child_obj(Object *parent, const char *childname, void *child, size_t childsize, const char *childtype) { object_initialize_child(parent, childname, child, childsize, childtype, &error_abort, NULL); qdev_set_parent_bus(DEVICE(child), sysbus_get_default()); } Suggested-by: Eduardo Habkost <ehabkost@redhat.com> Inspired-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> --- hw/microblaze/xlnx-zynqmp-pmu.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)