pflash: 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 '/^Parallel NOR Flash devices$/,/^$/{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: <20200707165037.1026246-5-armbru@redhat.com>
[ERRP_AUTO_PROPAGATE() renamed to ERRP_GUARD(), and
auto-propagated-errp.cocci to errp-guard.cocci.  Commit message
tweaked again.]

2 files changed, 6 insertions, 8 deletions

diff --git a/hw/block/pflash_cfi01.c b/hw/block/pflash_cfi01.c
index cddc3a5..8ab1d66 100644
--- a/hw/block/pflash_cfi01.c
+++ b/hw/block/pflash_cfi01.c
@@ -696,12 +696,12 @@ static const MemoryRegionOps pflash_cfi01_ops = {
 
 static void pflash_cfi01_realize(DeviceState *dev, Error **errp)
 {
+    ERRP_GUARD();
     PFlashCFI01 *pfl = PFLASH_CFI01(dev);
     uint64_t total_len;
     int ret;
     uint64_t blocks_per_device, sector_len_per_device, device_len;
     int num_devices;
-    Error *local_err = NULL;
 
     if (pfl->sector_len == 0) {
         error_setg(errp, "attribute \"sector-length\" not specified or zero.");
@@ -735,9 +735,8 @@ static void pflash_cfi01_realize(DeviceState *dev, Error **errp)
         &pfl->mem, OBJECT(dev),
         &pflash_cfi01_ops,
         pfl,
-        pfl->name, total_len, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+        pfl->name, total_len, errp);
+    if (*errp) {
         return;
     }
 
diff --git a/hw/block/pflash_cfi02.c b/hw/block/pflash_cfi02.c
index b40ce23..eb02fcc 100644
--- a/hw/block/pflash_cfi02.c
+++ b/hw/block/pflash_cfi02.c
@@ -724,9 +724,9 @@ static const MemoryRegionOps pflash_cfi02_ops = {
 
 static void pflash_cfi02_realize(DeviceState *dev, Error **errp)
 {
+    ERRP_GUARD();
     PFlashCFI02 *pfl = PFLASH_CFI02(dev);
     int ret;
-    Error *local_err = NULL;
 
     if (pfl->uniform_sector_len == 0 && pfl->sector_len[0] == 0) {
         error_setg(errp, "attribute \"sector-length\" not specified or zero.");
@@ -792,9 +792,8 @@ static void pflash_cfi02_realize(DeviceState *dev, Error **errp)
 
     memory_region_init_rom_device(&pfl->orig_mem, OBJECT(pfl),
                                   &pflash_cfi02_ops, pfl, pfl->name,
-                                  pfl->chip_len, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+                                  pfl->chip_len, errp);
+    if (*errp) {
         return;
     }