diff mbox series

[PULL,50/53] fw_cfg: Use ERRP_GUARD()

Message ID 20200707212503.1495927-51-armbru@redhat.com
State New
Headers show
Series [PULL,01/53] error: Fix examples in error.h's big comment | expand

Commit Message

Markus Armbruster July 7, 2020, 9:25 p.m. UTC 
From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

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.]
---
 hw/nvram/fw_cfg.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)
diff mbox series

Patch

diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index 0408a31f8e..61b00d765a 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -1231,12 +1231,11 @@  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;
     }
 
@@ -1282,14 +1281,13 @@  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;
     }