usb: Improve companion configuration error messages

The previous commit broke the additional messages explaining the error
messages.  Improve the error messages, so they don't need explaining
so much.  Helps QMP users as well, unlike additional explanations.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

2 files changed, 14 insertions, 25 deletions

diff --git a/hw/usb/bus.c b/hw/usb/bus.c
index 98e33ea..3751675 100644
--- a/hw/usb/bus.c
+++ b/hw/usb/bus.c
@@ -374,16 +374,14 @@ void usb_register_companion(const char *masterbus, USBPort *ports[],
         }
     }
 
-    if (!bus || !bus->ops->register_companion) {
-        error_set(errp, QERR_INVALID_PARAMETER_VALUE, "masterbus",
-                  "an USB masterbus");
-#if 0 /* conversion from qerror_report() to error_set() broke this: */
-        if (bus) {
-            error_printf_unless_qmp(
-                "USB bus '%s' does not allow companion controllers\n",
-                masterbus);
-        }
-#endif
+    if (!bus) {
+        error_setg(errp, "USB bus '%s' not found", masterbus);
+        return;
+    }
+    if (!bus->ops->register_companion) {
+        error_setg(errp, "Can't use USB bus '%s' as masterbus,"
+                   " it doesn't support companion controllers",
+                   masterbus);
         return;
     }
 
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 7d16ba8..5c2a452 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -777,26 +777,17 @@ static void ehci_register_companion(USBBus *bus, USBPort *ports[],
     uint32_t i;
 
     if (firstport + portcount > NB_PORTS) {
-        error_set(errp, QERR_INVALID_PARAMETER_VALUE, "firstport",
-                  "firstport on masterbus");
-#if 0 /* conversion from qerror_report() to error_set() broke this: */
-        error_printf_unless_qmp(
-            "firstport value of %u makes companion take ports %u - %u, which "
-            "is outside of the valid range of 0 - %u\n", firstport, firstport,
-            firstport + portcount - 1, NB_PORTS - 1);
-#endif
+        error_setg(errp, "firstport must be between 0 and %u",
+                   NB_PORTS - portcount);
         return;
     }
 
     for (i = 0; i < portcount; i++) {
         if (s->companion_ports[firstport + i]) {
-            error_set(errp, QERR_INVALID_PARAMETER_VALUE, "masterbus",
-                      "an USB masterbus");
-#if 0 /* conversion from qerror_report() to error_set() broke this: */
-            error_printf_unless_qmp(
-                "port %u on masterbus %s already has a companion assigned\n",
-                firstport + i, bus->qbus.name);
-#endif
+            error_setg(errp, "firstport %u asks for ports %u-%u,"
+                       " but port %u has a companion assigned already",
+                       firstport, firstport, firstport + portcount - 1,
+                       firstport + i);
             return;
         }
     }