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fw_cfg: Use ERRP_GUARD() 

If we want to check error after errp-function call, we need to
introduce local_err and then propagate it to errp. Instead, use
the ERRP_GUARD() macro, benefits are:
1. No need of explicit error_propagate call
2. No need of explicit local_err variable: use errp directly
3. ERRP_GUARD() leaves errp as is if it's not NULL or
   &error_fatal, this means that we don't break error_abort
   (we'll abort on error_set, not on error_propagate)

If we want to add some info to errp (by error_prepend() or
error_append_hint()), we must use the ERRP_GUARD() macro.
Otherwise, this info will not be added when errp == &error_fatal
(the program will exit prior to the error_append_hint() or
error_prepend() call).  No such cases are being fixed here.

This commit is generated by command

    sed -n '/^Firmware configuration (fw_cfg)$/,/^$/{s/^F: //p}' \
        MAINTAINERS | \
    xargs git ls-files | grep '\.[hc]$' | \
    xargs spatch \
        --sp-file scripts/coccinelle/errp-guard.cocci \
        --macro-file scripts/cocci-macro-file.h \
        --in-place --no-show-diff --max-width 80

Reported-by: Kevin Wolf <kwolf@redhat.com>
Reported-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
[Commit message tweaked]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200707165037.1026246-6-armbru@redhat.com>
[ERRP_AUTO_PROPAGATE() renamed to ERRP_GUARD(), and
auto-propagated-errp.cocci to errp-guard.cocci.  Commit message
tweaked again.  Coccinelle script rerun for commit 3203148917
"hw/nvram/fw_cfg: Add the FW_CFG_DATA_GENERATOR interface"]
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2020-07-07 18:50:34 +02:00 committed by Markus Armbruster
parent 76612456aa
commit 8b4b52759a
1 changed files with 9 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
hw/nvram/fw_cfg.c
View File

@ -1035,8 +1035,8 @@ void *fw_cfg_modify_file(FWCfgState *s, const char *filename,
void fw_cfg_add_from_generator(FWCfgState *s, const char *filename,
const char *gen_id, Error **errp)
{
ERRP_GUARD();
FWCfgDataGeneratorClass *klass;
Error *local_err = NULL;
GByteArray *array;
Object *obj;
gsize size;
@ -1052,9 +1052,8 @@ void fw_cfg_add_from_generator(FWCfgState *s, const char *filename,
return;
}
klass = FW_CFG_DATA_GENERATOR_GET_CLASS(obj);
array = klass->get_data(obj, &local_err);
if (local_err) {
error_propagate(errp, local_err);
array = klass->get_data(obj, errp);
if (*errp) {
return;
}
size = array->len;
@ -1260,12 +1259,11 @@ static Property fw_cfg_io_properties[] = {
static void fw_cfg_io_realize(DeviceState *dev, Error **errp)
{
ERRP_GUARD();
FWCfgIoState *s = FW_CFG_IO(dev);
Error *local_err = NULL;
fw_cfg_file_slots_allocate(FW_CFG(s), &local_err);
if (local_err) {
error_propagate(errp, local_err);
fw_cfg_file_slots_allocate(FW_CFG(s), errp);
if (*errp) {
return;
}
@ -1311,14 +1309,13 @@ static Property fw_cfg_mem_properties[] = {
static void fw_cfg_mem_realize(DeviceState *dev, Error **errp)
{
ERRP_GUARD();
FWCfgMemState *s = FW_CFG_MEM(dev);
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
const MemoryRegionOps *data_ops = &fw_cfg_data_mem_ops;
Error *local_err = NULL;
fw_cfg_file_slots_allocate(FW_CFG(s), &local_err);
if (local_err) {
error_propagate(errp, local_err);
fw_cfg_file_slots_allocate(FW_CFG(s), errp);
if (*errp) {
return;
}