[RFC v5 043/126] ACPI/SMBIOS: introduce ERRP_AUTO_PROPAGATE

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

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/acpi/core.c           | 18 ++++++++---------
 hw/acpi/cpu_hotplug.c    |  2 +-
 hw/acpi/memory_hotplug.c |  7 +++----
 hw/mem/memory-device.c   | 20 +++++++++----------
 hw/mem/pc-dimm.c         | 23 ++++++++++------------
 hw/smbios/smbios.c       | 42 ++++++++++++++++------------------------
 6 files changed, 48 insertions(+), 64 deletions(-)

diff --git a/hw/acpi/core.c b/hw/acpi/core.c
index 45cbed49ab..2ade3d45e4 100644
--- a/hw/acpi/core.c
+++ b/hw/acpi/core.c
@@ -238,8 +238,8 @@ static void acpi_table_install(const char unsigned *blob, size_t bloblen,
 
 void acpi_table_add(const QemuOpts *opts, Error **errp)
 {
+    ERRP_AUTO_PROPAGATE();
     AcpiTableOptions *hdrs = NULL;
-    Error *err = NULL;
     char **pathnames = NULL;
     char **cur;
     size_t bloblen = 0;
@@ -249,21 +249,21 @@ void acpi_table_add(const QemuOpts *opts, Error **errp)
         Visitor *v;
 
         v = opts_visitor_new(opts);
-        visit_type_AcpiTableOptions(v, NULL, &hdrs, &err);
+        visit_type_AcpiTableOptions(v, NULL, &hdrs, errp);
         visit_free(v);
     }
 
-    if (err) {
+    if (*errp) {
         goto out;
     }
     if (hdrs->has_file == hdrs->has_data) {
-        error_setg(&err, "'-acpitable' requires one of 'data' or 'file'");
+        error_setg(errp, "'-acpitable' requires one of 'data' or 'file'");
         goto out;
     }
 
     pathnames = g_strsplit(hdrs->has_file ? hdrs->file : hdrs->data, ":", 0);
     if (pathnames == NULL || pathnames[0] == NULL) {
-        error_setg(&err, "'-acpitable' requires at least one pathname");
+        error_setg(errp, "'-acpitable' requires at least one pathname");
         goto out;
     }
 
@@ -272,7 +272,7 @@ void acpi_table_add(const QemuOpts *opts, Error **errp)
         int fd = open(*cur, O_RDONLY | O_BINARY);
 
         if (fd < 0) {
-            error_setg(&err, "can't open file %s: %s", *cur, strerror(errno));
+            error_setg(errp, "can't open file %s: %s", *cur, strerror(errno));
             goto out;
         }
 
@@ -288,7 +288,7 @@ void acpi_table_add(const QemuOpts *opts, Error **errp)
                 memcpy(blob + bloblen, data, r);
                 bloblen += r;
             } else if (errno != EINTR) {
-                error_setg(&err, "can't read file %s: %s",
+                error_setg(errp, "can't read file %s: %s",
                            *cur, strerror(errno));
                 close(fd);
                 goto out;
@@ -298,14 +298,12 @@ void acpi_table_add(const QemuOpts *opts, Error **errp)
         close(fd);
     }
 
-    acpi_table_install(blob, bloblen, hdrs->has_file, hdrs, &err);
+    acpi_table_install(blob, bloblen, hdrs->has_file, hdrs, errp);
 
 out:
     g_free(blob);
     g_strfreev(pathnames);
     qapi_free_AcpiTableOptions(hdrs);
-
-    error_propagate(errp, err);
 }
 
 unsigned acpi_table_len(void *current)
diff --git a/hw/acpi/cpu_hotplug.c b/hw/acpi/cpu_hotplug.c
index 6e8293aac9..cef72139fa 100644
--- a/hw/acpi/cpu_hotplug.c
+++ b/hw/acpi/cpu_hotplug.c
@@ -75,7 +75,7 @@ void legacy_acpi_cpu_plug_cb(HotplugHandler *hotplug_dev,
                              AcpiCpuHotplug *g, DeviceState *dev, Error **errp)
 {
     acpi_set_cpu_present_bit(g, CPU(dev), errp);
-    if (*errp != NULL) {
+    if (*errp) {
         return;
     }
     acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
diff --git a/hw/acpi/memory_hotplug.c b/hw/acpi/memory_hotplug.c
index 9483d66e86..b127040613 100644
--- a/hw/acpi/memory_hotplug.c
+++ b/hw/acpi/memory_hotplug.c
@@ -241,12 +241,11 @@ static MemStatus *
 acpi_memory_slot_status(MemHotplugState *mem_st,
                         DeviceState *dev, Error **errp)
 {
-    Error *local_err = NULL;
+    ERRP_AUTO_PROPAGATE();
     int slot = object_property_get_int(OBJECT(dev), PC_DIMM_SLOT_PROP,
-                                       &local_err);
+                                       errp);
 
-    if (local_err) {
-        error_propagate(errp, local_err);
+    if (*errp) {
         return NULL;
     }
 
diff --git a/hw/mem/memory-device.c b/hw/mem/memory-device.c
index 53953fdc3a..f2b8de52aa 100644
--- a/hw/mem/memory-device.c
+++ b/hw/mem/memory-device.c
@@ -253,30 +253,28 @@ uint64_t get_plugged_memory_size(void)
 void memory_device_pre_plug(MemoryDeviceState *md, MachineState *ms,
                             const uint64_t *legacy_align, Error **errp)
 {
+    ERRP_AUTO_PROPAGATE();
     const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md);
-    Error *local_err = NULL;
     uint64_t addr, align;
     MemoryRegion *mr;
 
-    mr = mdc->get_memory_region(md, &local_err);
-    if (local_err) {
-        goto out;
+    mr = mdc->get_memory_region(md, errp);
+    if (*errp) {
+        return;
     }
 
     align = legacy_align ? *legacy_align : memory_region_get_alignment(mr);
     addr = mdc->get_addr(md);
     addr = memory_device_get_free_addr(ms, !addr ? NULL : &addr, align,
-                                       memory_region_size(mr), &local_err);
-    if (local_err) {
-        goto out;
+                                       memory_region_size(mr), errp);
+    if (*errp) {
+        return;
     }
-    mdc->set_addr(md, addr, &local_err);
-    if (!local_err) {
+    mdc->set_addr(md, addr, errp);
+    if (!*errp) {
         trace_memory_device_pre_plug(DEVICE(md)->id ? DEVICE(md)->id : "",
                                      addr);
     }
-out:
-    error_propagate(errp, local_err);
 }
 
 void memory_device_plug(MemoryDeviceState *md, MachineState *ms)
diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
index 99e2faf01b..f1ffb7b225 100644
--- a/hw/mem/pc-dimm.c
+++ b/hw/mem/pc-dimm.c
@@ -37,31 +37,29 @@ static int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp);
 void pc_dimm_pre_plug(PCDIMMDevice *dimm, MachineState *machine,
                       const uint64_t *legacy_align, Error **errp)
 {
-    Error *local_err = NULL;
+    ERRP_AUTO_PROPAGATE();
     int slot;
 
     slot = object_property_get_int(OBJECT(dimm), PC_DIMM_SLOT_PROP,
                                    &error_abort);
     if ((slot < 0 || slot >= machine->ram_slots) &&
          slot != PC_DIMM_UNASSIGNED_SLOT) {
-        error_setg(&local_err, "invalid slot number, valid range is [0-%"
+        error_setg(errp, "invalid slot number, valid range is [0-%"
                    PRIu64 "]", machine->ram_slots - 1);
-        goto out;
+        return;
     }
 
     slot = pc_dimm_get_free_slot(slot == PC_DIMM_UNASSIGNED_SLOT ? NULL : &slot,
-                                 machine->ram_slots, &local_err);
-    if (local_err) {
-        goto out;
+                                 machine->ram_slots, errp);
+    if (*errp) {
+        return;
     }
     object_property_set_int(OBJECT(dimm), slot, PC_DIMM_SLOT_PROP,
                             &error_abort);
     trace_mhp_pc_dimm_assigned_slot(slot);
 
     memory_device_pre_plug(MEMORY_DEVICE(dimm), machine, legacy_align,
-                           &local_err);
-out:
-    error_propagate(errp, local_err);
+                           errp);
 }
 
 void pc_dimm_plug(PCDIMMDevice *dimm, MachineState *machine, Error **errp)
@@ -150,12 +148,11 @@ static Property pc_dimm_properties[] = {
 static void pc_dimm_get_size(Object *obj, Visitor *v, const char *name,
                              void *opaque, Error **errp)
 {
-    Error *local_err = NULL;
+    ERRP_AUTO_PROPAGATE();
     uint64_t value;
 
-    value = memory_device_get_region_size(MEMORY_DEVICE(obj), &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+    value = memory_device_get_region_size(MEMORY_DEVICE(obj), errp);
+    if (*errp) {
         return;
     }
 
diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
index 11d476c4a2..8dac885173 100644
--- a/hw/smbios/smbios.c
+++ b/hw/smbios/smbios.c
@@ -954,7 +954,7 @@ static void save_opt_list(size_t *ndest, const char ***dest,
 
 void smbios_entry_add(QemuOpts *opts, Error **errp)
 {
-    Error *err = NULL;
+    ERRP_AUTO_PROPAGATE();
     const char *val;
 
     assert(!smbios_immutable);
@@ -965,9 +965,8 @@ void smbios_entry_add(QemuOpts *opts, Error **errp)
         int size;
         struct smbios_table *table; /* legacy mode only */
 
-        qemu_opts_validate(opts, qemu_smbios_file_opts, &err);
-        if (err) {
-            error_propagate(errp, err);
+        qemu_opts_validate(opts, qemu_smbios_file_opts, errp);
+        if (*errp) {
             return;
         }
 
@@ -1052,9 +1051,8 @@ void smbios_entry_add(QemuOpts *opts, Error **errp)
 
         switch (type) {
         case 0:
-            qemu_opts_validate(opts, qemu_smbios_type0_opts, &err);
-            if (err) {
-                error_propagate(errp, err);
+            qemu_opts_validate(opts, qemu_smbios_type0_opts, errp);
+            if (*errp) {
                 return;
             }
             save_opt(&type0.vendor, opts, "vendor");
@@ -1072,9 +1070,8 @@ void smbios_entry_add(QemuOpts *opts, Error **errp)
             }
             return;
         case 1:
-            qemu_opts_validate(opts, qemu_smbios_type1_opts, &err);
-            if (err) {
-                error_propagate(errp, err);
+            qemu_opts_validate(opts, qemu_smbios_type1_opts, errp);
+            if (*errp) {
                 return;
             }
             save_opt(&type1.manufacturer, opts, "manufacturer");
@@ -1094,9 +1091,8 @@ void smbios_entry_add(QemuOpts *opts, Error **errp)
             }
             return;
         case 2:
-            qemu_opts_validate(opts, qemu_smbios_type2_opts, &err);
-            if (err) {
-                error_propagate(errp, err);
+            qemu_opts_validate(opts, qemu_smbios_type2_opts, errp);
+            if (*errp) {
                 return;
             }
             save_opt(&type2.manufacturer, opts, "manufacturer");
@@ -1107,9 +1103,8 @@ void smbios_entry_add(QemuOpts *opts, Error **errp)
             save_opt(&type2.location, opts, "location");
             return;
         case 3:
-            qemu_opts_validate(opts, qemu_smbios_type3_opts, &err);
-            if (err) {
-                error_propagate(errp, err);
+            qemu_opts_validate(opts, qemu_smbios_type3_opts, errp);
+            if (*errp) {
                 return;
             }
             save_opt(&type3.manufacturer, opts, "manufacturer");
@@ -1119,9 +1114,8 @@ void smbios_entry_add(QemuOpts *opts, Error **errp)
             save_opt(&type3.sku, opts, "sku");
             return;
         case 4:
-            qemu_opts_validate(opts, qemu_smbios_type4_opts, &err);
-            if (err) {
-                error_propagate(errp, err);
+            qemu_opts_validate(opts, qemu_smbios_type4_opts, errp);
+            if (*errp) {
                 return;
             }
             save_opt(&type4.sock_pfx, opts, "sock_pfx");
@@ -1132,17 +1126,15 @@ void smbios_entry_add(QemuOpts *opts, Error **errp)
             save_opt(&type4.part, opts, "part");
             return;
         case 11:
-            qemu_opts_validate(opts, qemu_smbios_type11_opts, &err);
-            if (err) {
-                error_propagate(errp, err);
+            qemu_opts_validate(opts, qemu_smbios_type11_opts, errp);
+            if (*errp) {
                 return;
             }
             save_opt_list(&type11.nvalues, &type11.values, opts, "value");
             return;
         case 17:
-            qemu_opts_validate(opts, qemu_smbios_type17_opts, &err);
-            if (err) {
-                error_propagate(errp, err);
+            qemu_opts_validate(opts, qemu_smbios_type17_opts, errp);
+            if (*errp) {
                 return;
             }
             save_opt(&type17.loc_pfx, opts, "loc_pfx");
-- 
2.21.0