[PULL 03/13] hw/cxl: Convert cxl_fmws_link() to Error

[Markus Armbruster <armbru@redhat.com>]

Functions that use an Error **errp parameter to return errors should
not also report them to the user, because reporting is the caller's
job.  When the caller does, the error is reported twice.  When it
doesn't (because it recovered from the error), there is no error to
report, i.e. the report is bogus.

cxl_fmws_link_targets() violates this principle: it calls
error_setg(&error_fatal, ...) via cxl_fmws_link().  Goes back to
commit 584f722eb3ab (hw/cxl: Make the CXL fixed memory windows
devices.)  Currently harmless, because cxl_fmws_link_targets()'s
callers always pass &error_fatal.  Clean this up by converting
cxl_fmws_link() to Error.

Also change its return value on error from 1 to -1 to conform to the
rules laid in qapi/error.h.  It's call chain cxl_fmws_link_targets()
via object_child_foreach_recursive() is fine with that.

Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20250923091000.3180122-4-armbru@redhat.com>
Reviewed-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
---
 hw/cxl/cxl-host.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/hw/cxl/cxl-host.c b/hw/cxl/cxl-host.c
index 5c2ce25a19..0d891c651d 100644
--- a/hw/cxl/cxl-host.c
+++ b/hw/cxl/cxl-host.c
@@ -72,6 +72,7 @@ static void cxl_fixed_memory_window_config(CXLFixedMemoryWindowOptions *object,
 
 static int cxl_fmws_link(Object *obj, void *opaque)
 {
+    Error **errp = opaque;
     struct CXLFixedWindow *fw;
     int i;
 
@@ -87,9 +88,9 @@ static int cxl_fmws_link(Object *obj, void *opaque)
         o = object_resolve_path_type(fw->targets[i], TYPE_PXB_CXL_DEV,
                                      &ambig);
         if (!o) {
-            error_setg(&error_fatal, "Could not resolve CXLFM target %s",
+            error_setg(errp, "Could not resolve CXLFM target %s",
                        fw->targets[i]);
-            return 1;
+            return -1;
         }
         fw->target_hbs[i] = PXB_CXL_DEV(o);
     }
@@ -99,7 +100,7 @@ static int cxl_fmws_link(Object *obj, void *opaque)
 void cxl_fmws_link_targets(Error **errp)
 {
     /* Order doesn't matter for this, so no need to build list */
-    object_child_foreach_recursive(object_get_root(), cxl_fmws_link, NULL);
+    object_child_foreach_recursive(object_get_root(), cxl_fmws_link, errp);
 }
 
 static bool cxl_hdm_find_target(uint32_t *cache_mem, hwaddr addr,
-- 
2.49.0