[RFC v5 056/126] virtio-ccw: introduce ERRP_AUTO_PROPAGATE

[Vladimir Sementsov-Ogievskiy]

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 <address@hidden>
Reported-by: Greg Kurz <address@hidden>
Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
---
 hw/s390x/virtio-ccw-crypto.c |  7 +++----
 hw/s390x/virtio-ccw-rng.c    |  7 +++----
 hw/s390x/virtio-ccw.c        | 13 ++++++-------
 3 files changed, 12 insertions(+), 15 deletions(-)

diff --git a/hw/s390x/virtio-ccw-crypto.c b/hw/s390x/virtio-ccw-crypto.c
index 086b397ad2..b942179f3f 100644
--- a/hw/s390x/virtio-ccw-crypto.c
+++ b/hw/s390x/virtio-ccw-crypto.c
@@ -17,14 +17,13 @@
 
 static void virtio_ccw_crypto_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 {
+    ERRP_AUTO_PROPAGATE();
     VirtIOCryptoCcw *dev = VIRTIO_CRYPTO_CCW(ccw_dev);
     DeviceState *vdev = DEVICE(&dev->vdev);
-    Error *err = NULL;
 
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
-    object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
-        error_propagate(errp, err);
+    object_property_set_bool(OBJECT(vdev), true, "realized", errp);
+    if (*errp) {
         return;
     }
 
diff --git a/hw/s390x/virtio-ccw-rng.c b/hw/s390x/virtio-ccw-rng.c
index 854254dd50..bc242f1fc6 100644
--- a/hw/s390x/virtio-ccw-rng.c
+++ b/hw/s390x/virtio-ccw-rng.c
@@ -18,14 +18,13 @@
 
 static void virtio_ccw_rng_realize(VirtioCcwDevice *ccw_dev, Error **errp)
 {
+    ERRP_AUTO_PROPAGATE();
     VirtIORNGCcw *dev = VIRTIO_RNG_CCW(ccw_dev);
     DeviceState *vdev = DEVICE(&dev->vdev);
-    Error *err = NULL;
 
     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
-    object_property_set_bool(OBJECT(vdev), true, "realized", &err);
-    if (err) {
-        error_propagate(errp, err);
+    object_property_set_bool(OBJECT(vdev), true, "realized", errp);
+    if (*errp) {
         return;
     }
 
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index 6580ce5907..3d80b27ef5 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -692,18 +692,18 @@ static void virtio_sch_disable_cb(SubchDev *sch)
 
 static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp)
 {
+    ERRP_AUTO_PROPAGATE();
     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
     CcwDevice *ccw_dev = CCW_DEVICE(dev);
     CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
     SubchDev *sch;
-    Error *err = NULL;
 
     sch = css_create_sch(ccw_dev->devno, errp);
     if (!sch) {
         return;
     }
     if (!virtio_ccw_rev_max(dev) && dev->force_revision_1) {
-        error_setg(&err, "Invalid value of property max_rev "
+        error_setg(errp, "Invalid value of property max_rev "
                    "(is %d expected >= 1)", virtio_ccw_rev_max(dev));
         goto out_err;
     }
@@ -728,21 +728,20 @@ static void virtio_ccw_device_realize(VirtioCcwDevice 
*dev, Error **errp)
     }
 
     if (k->realize) {
-        k->realize(dev, &err);
-        if (err) {
+        k->realize(dev, errp);
+        if (*errp) {
             goto out_err;
         }
     }
 
-    ck->realize(ccw_dev, &err);
-    if (err) {
+    ck->realize(ccw_dev, errp);
+    if (*errp) {
         goto out_err;
     }
 
     return;
 
 out_err:
-    error_propagate(errp, err);
     css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
     ccw_dev->sch = NULL;
     g_free(sch);
-- 
2.21.0