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[Qemu-devel] [PATCH] sd: Fix "info qtree" on boards with SD cards

From: Peter Maydell
Subject: [Qemu-devel] [PATCH] sd: Fix "info qtree" on boards with SD cards
Date: Tue, 15 Mar 2016 16:56:49 +0000

The SD card object is not a SysBusDevice, so don't create it with
qdev_create() if we're not assigning it to a specific bus; use
object_new() instead.

This was causing 'info qtree' to segfault on boards with SD cards,
because qdev_create(NULL, TYPE_FOO) puts the created object on the
system bus, and then we may try to run functions like sysbus_dev_print()
on it, which fail when casting the object to SysBusDevice.

(This is the same mistake that we made with the NAND device
and fixed in commit 6749695eaaf346c1.)

Reported-by: hitmoon <address@hidden>
Signed-off-by: Peter Maydell <address@hidden>
I assume that using qdev_create() for non-SysBus devices is
OK if we are passing in a specific bus pointer, because we do
this already for various things including PCI devices. The
various "properly QOMified" uses of TYPE_SD_CARD do that; only
this sd_init() function for the legacy uses doesn't.
 hw/sd/sd.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index 00c320d..1568057 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -563,17 +563,19 @@ static const VMStateDescription sd_vmstate = {
 /* Legacy initialization function for use by non-qdevified callers */
 SDState *sd_init(BlockBackend *blk, bool is_spi)
+    Object *obj;
     DeviceState *dev;
     Error *err = NULL;
-    dev = qdev_create(NULL, TYPE_SD_CARD);
+    obj = object_new(TYPE_SD_CARD);
+    dev = DEVICE(obj);
     qdev_prop_set_drive(dev, "drive", blk, &err);
     if (err) {
         error_report("sd_init failed: %s", error_get_pretty(err));
         return NULL;
     qdev_prop_set_bit(dev, "spi", is_spi);
-    object_property_set_bool(OBJECT(dev), true, "realized", &err);
+    object_property_set_bool(obj, true, "realized", &err);
     if (err) {
         error_report("sd_init failed: %s", error_get_pretty(err));
         return NULL;

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