[Qemu-devel] [PATCH for-2.3 3/3] sysbus: Contain drive_get_next() misuse

[Markus Armbruster <armbru@redhat.com>]

A number of sysbus devices abuse drive_get_next(): sl-nand,
milkymist-memcard, pl181, generic-sdhci.  If you can't see what's
wrong with their use of drive_get_next(), check out the FIXMEs in
their init() methods and the commit that added them.

We're in luck, though: only machines ppce500 and pseries-* support
-device with sysbus devices, and none of the devices above is
available with these machines.

Set cannot_instantiate_with_device_add_yet to preserve our luck.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 hw/arm/spitz.c            | 2 ++
 hw/sd/milkymist-memcard.c | 2 ++
 hw/sd/pl181.c             | 2 ++
 hw/sd/sdhci.c             | 3 +++
 4 files changed, 9 insertions(+)

diff --git a/hw/arm/spitz.c b/hw/arm/spitz.c
index da02932..5bf032a 100644
--- a/hw/arm/spitz.c
+++ b/hw/arm/spitz.c
@@ -1036,6 +1036,8 @@ static void sl_nand_class_init(ObjectClass *klass, void *data)
     k->init = sl_nand_init;
     dc->vmsd = &vmstate_sl_nand_info;
     dc->props = sl_nand_properties;
+    /* Reason: init() method uses drive_get() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo sl_nand_info = {
diff --git a/hw/sd/milkymist-memcard.c b/hw/sd/milkymist-memcard.c
index 0cc53d9..2209ef1 100644
--- a/hw/sd/milkymist-memcard.c
+++ b/hw/sd/milkymist-memcard.c
@@ -297,6 +297,8 @@ static void milkymist_memcard_class_init(ObjectClass *klass, void *data)
     k->init = milkymist_memcard_init;
     dc->reset = milkymist_memcard_reset;
     dc->vmsd = &vmstate_milkymist_memcard;
+    /* Reason: init() method uses drive_get_next() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo milkymist_memcard_info = {
diff --git a/hw/sd/pl181.c b/hw/sd/pl181.c
index bf37da6..11fcd47 100644
--- a/hw/sd/pl181.c
+++ b/hw/sd/pl181.c
@@ -508,6 +508,8 @@ static void pl181_class_init(ObjectClass *klass, void *data)
     sdc->init = pl181_init;
     k->vmsd = &vmstate_pl181;
     k->reset = pl181_reset;
+    /* Reason: init() method uses drive_get_next() */
+    k->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo pl181_info = {
diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index ab13505..e4c70b5 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -1297,12 +1297,15 @@ static void sdhci_sysbus_class_init(ObjectClass *klass, void *data)
     dc->vmsd = &sdhci_vmstate;
     dc->props = sdhci_properties;
     dc->realize = sdhci_sysbus_realize;
+    /* Reason: instance_init() method uses drive_get_next() */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo sdhci_sysbus_info = {
     .name = TYPE_SYSBUS_SDHCI,
     .parent = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(SDHCIState),
+    /* FIXME SysBusDeviceClass init() instead of .instance_init */
     .instance_init = sdhci_sysbus_init,
     .instance_finalize = sdhci_sysbus_finalize,
     .class_init = sdhci_sysbus_class_init,
-- 
1.9.3