motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-02 23:33:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

qom: Clean up fragile use of error_is_set() in set() methods

Browse source 
Using error_is_set(ERRP) to find out whether a function failed is
either wrong, fragile, or unnecessarily opaque.  It's wrong when ERRP
may be null, because errors go undetected when it is.  It's fragile
when proving ERRP non-null involves a non-local argument.  Else, it's
unnecessarily opaque (see commit 84d18f0).

I guess the error_is_set(errp) in the ObjectProperty set() methods are
merely fragile right now, because I can't find a call chain that
passes a null errp argument.

Make the code more robust and more obviously correct: receive the
error in a local variable, then propagate it through the parameter.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Markus Armbruster 2014-04-25 12:44:22 +02:00 • committed by Andreas Färber
parent a7737e4496
commit 65cd9064e1
6 changed files with 45 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

11
hw/core/qdev-properties.c
View file

@ -751,6 +751,7 @@ static void set_prop_arraylen(Object *obj, Visitor *v, void *opaque,
Property *prop = opaque;
uint32_t *alenptr = qdev_get_prop_ptr(dev, prop);
void **arrayptr = (void *)dev + prop->arrayoffset;
Error *local_err = NULL;
void *eltptr;
const char *arrayname;
int i;
@ -764,8 +765,9 @@ static void set_prop_arraylen(Object *obj, Visitor *v, void *opaque,
name);
return;
}
visit_type_uint32(v, alenptr, name, errp);
if (error_is_set(errp)) {
visit_type_uint32(v, alenptr, name, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (!*alenptr) {
@ -802,8 +804,9 @@ static void set_prop_arraylen(Object *obj, Visitor *v, void *opaque,
arrayprop->prop.info->get,
arrayprop->prop.info->set,
array_element_release,
arrayprop, errp);
if (error_is_set(errp)) {
arrayprop, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}