diff mbox series

[RFC,v5,044/126] Network devices: introduce ERRP_AUTO_PROPAGATE

Message ID 20191011160552.22907-45-vsementsov@virtuozzo.com
State New
Headers show
Series error: auto propagated local_err | expand

Commit Message

Vladimir Sementsov-Ogievskiy Oct. 11, 2019, 4:04 p.m. UTC
If we want to add some info to errp (by error_prepend() or
error_append_hint()), we must use the ERRP_AUTO_PROPAGATE macro.
Otherwise, this info will not be added when errp == &fatal_err
(the program will exit prior to the error_append_hint() or
error_prepend() call).  Fix such cases.

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

This commit (together with its neighbors) was generated by

for f in $(git grep -l errp \*.[ch]); do \
    spatch --sp-file scripts/coccinelle/auto-propagated-errp.cocci \
    --macro-file scripts/cocci-macro-file.h --in-place --no-show-diff $f; \
done;

then fix a bit of compilation problems: coccinelle for some reason
leaves several
f() {
    ...
    goto out;
    ...
    out:
}
patterns, with "out:" at function end.

then
./python/commit-per-subsystem.py MAINTAINERS "$(< auto-msg)"

(auto-msg was a file with this commit message)

Still, for backporting it may be more comfortable to use only the first
command and then do one huge commit.

Reported-by: Kevin Wolf <kwolf@redhat.com>
Reported-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 hw/net/dp8393x.c    |  7 +++----
 hw/net/ne2000-isa.c | 17 +++++++----------
 2 files changed, 10 insertions(+), 14 deletions(-)
diff mbox series

Patch

diff --git a/hw/net/dp8393x.c b/hw/net/dp8393x.c
index a5678e11fa..4def282da5 100644
--- a/hw/net/dp8393x.c
+++ b/hw/net/dp8393x.c
@@ -874,10 +874,10 @@  static void dp8393x_instance_init(Object *obj)
 
 static void dp8393x_realize(DeviceState *dev, Error **errp)
 {
+    ERRP_AUTO_PROPAGATE();
     dp8393xState *s = DP8393X(dev);
     int i, checksum;
     uint8_t *prom;
-    Error *local_err = NULL;
 
     address_space_init(&s->as, s->dma_mr, "dp8393x");
     memory_region_init_io(&s->mmio, OBJECT(dev), &dp8393x_ops, s,
@@ -891,9 +891,8 @@  static void dp8393x_realize(DeviceState *dev, Error **errp)
     s->regs[SONIC_SR] = 0x0004; /* only revision recognized by Linux */
 
     memory_region_init_ram(&s->prom, OBJECT(dev),
-                           "dp8393x-prom", SONIC_PROM_SIZE, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+                           "dp8393x-prom", SONIC_PROM_SIZE, errp);
+    if (*errp) {
         return;
     }
     memory_region_set_readonly(&s->prom, true);
diff --git a/hw/net/ne2000-isa.c b/hw/net/ne2000-isa.c
index 6fcf3d5cd9..73c88a907e 100644
--- a/hw/net/ne2000-isa.c
+++ b/hw/net/ne2000-isa.c
@@ -108,25 +108,22 @@  static void isa_ne2000_set_bootindex(Object *obj, Visitor *v,
                                      const char *name, void *opaque,
                                      Error **errp)
 {
+    ERRP_AUTO_PROPAGATE();
     ISANE2000State *isa = ISA_NE2000(obj);
     NE2000State *s = &isa->ne2000;
     int32_t boot_index;
-    Error *local_err = NULL;
 
-    visit_type_int32(v, name, &boot_index, &local_err);
-    if (local_err) {
-        goto out;
+    visit_type_int32(v, name, &boot_index, errp);
+    if (*errp) {
+        return;
     }
     /* check whether bootindex is present in fw_boot_order list  */
-    check_boot_index(boot_index, &local_err);
-    if (local_err) {
-        goto out;
+    check_boot_index(boot_index, errp);
+    if (*errp) {
+        return;
     }
     /* change bootindex to a new one */
     s->c.bootindex = boot_index;
-
-out:
-    error_propagate(errp, local_err);
 }
 
 static void isa_ne2000_instance_init(Object *obj)