[PATCH v9 03/10] hw/sd/ssi-sd: fix error handling in ssi_sd_realize

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

It's wrong to use same err object as errp parameter for several
function calls without intermediate checking for error: we'll crash if
try to set err object twice.

Fix that, using new ERRP_AUTO_PROPAGATE macro.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 hw/sd/ssi-sd.c | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)

diff --git a/hw/sd/ssi-sd.c b/hw/sd/ssi-sd.c
index 91db069212..bc44e1a0f5 100644
--- a/hw/sd/ssi-sd.c
+++ b/hw/sd/ssi-sd.c
@@ -241,10 +241,10 @@ static const VMStateDescription vmstate_ssi_sd = {
 
 static void ssi_sd_realize(SSISlave *d, Error **errp)
 {
+    ERRP_AUTO_PROPAGATE();
     ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, d);
     DeviceState *carddev;
     DriveInfo *dinfo;
-    Error *err = NULL;
 
     qbus_create_inplace(&s->sdbus, sizeof(s->sdbus), TYPE_SD_BUS,
                         DEVICE(d), "sd-bus");
@@ -254,14 +254,26 @@ static void ssi_sd_realize(SSISlave *d, Error **errp)
     dinfo = drive_get_next(IF_SD);
     carddev = qdev_create(BUS(&s->sdbus), TYPE_SD_CARD);
     if (dinfo) {
-        qdev_prop_set_drive(carddev, "drive", blk_by_legacy_dinfo(dinfo), &err);
+        qdev_prop_set_drive(carddev, "drive", blk_by_legacy_dinfo(dinfo), errp);
+        if (*errp) {
+            goto fail;
+        }
+    }
+
+    object_property_set_bool(OBJECT(carddev), true, "spi", errp);
+    if (*errp) {
+        goto fail;
     }
-    object_property_set_bool(OBJECT(carddev), true, "spi", &err);
-    object_property_set_bool(OBJECT(carddev), true, "realized", &err);
-    if (err) {
-        error_setg(errp, "failed to init SD card: %s", error_get_pretty(err));
-        return;
+
+    object_property_set_bool(OBJECT(carddev), true, "realized", errp);
+    if (*errp) {
+        goto fail;
     }
+
+    return;
+
+fail:
+    error_prepend(errp, "failed to init SD card: ");
 }
 
 static void ssi_sd_reset(DeviceState *dev)
-- 
2.21.0