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[PULL,02/11] hw/arm/collie: Put StrongARMState* into a CollieMachineState struct

Message ID 20200406101205.23027-3-peter.maydell@linaro.org
State Accepted
Commit 8a2b76ffc9ff610c3439617e19f1eb9be02be50f
Headers show
Series target-arm queue | expand

Commit Message

Peter Maydell April 6, 2020, 10:11 a.m. UTC 
Coverity complains that the collie_init() function leaks the memory
allocated in sa1110_init().  This is true but not significant since
the function is called only once on machine init and the memory must
remain in existence until QEMU exits anyway.

Still, we can avoid the technical memory leak by keeping the pointer
to the StrongARMState inside the machine state struct.  Switch from
the simple DEFINE_MACHINE() style to defining a subclass of
TYPE_MACHINE which extends the MachineState struct, and keep the
pointer there.

Fixes: CID 1421921
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

Message-id: 20200326204919.22006-1-peter.maydell@linaro.org
---
 hw/arm/collie.c | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

-- 
2.20.1
diff mbox series

Patch

diff --git a/hw/arm/collie.c b/hw/arm/collie.c
index 4992084a3f6..4b35ef4bed6 100644
--- a/hw/arm/collie.c
+++ b/hw/arm/collie.c
@@ -19,6 +19,16 @@ 
 #include "exec/address-spaces.h"
 #include "cpu.h"
 
+typedef struct {
+    MachineState parent;
+
+    StrongARMState *sa1110;
+} CollieMachineState;
+
+#define TYPE_COLLIE_MACHINE MACHINE_TYPE_NAME("collie")
+#define COLLIE_MACHINE(obj) \
+    OBJECT_CHECK(CollieMachineState, obj, TYPE_COLLIE_MACHINE)
+
 static struct arm_boot_info collie_binfo = {
     .loader_start = SA_SDCS0,
     .ram_size = 0x20000000,
@@ -26,9 +36,9 @@  static struct arm_boot_info collie_binfo = {
 
 static void collie_init(MachineState *machine)
 {
-    StrongARMState *s;
     DriveInfo *dinfo;
     MachineClass *mc = MACHINE_GET_CLASS(machine);
+    CollieMachineState *cms = COLLIE_MACHINE(machine);
 
     if (machine->ram_size != mc->default_ram_size) {
         char *sz = size_to_str(mc->default_ram_size);
@@ -37,7 +47,7 @@  static void collie_init(MachineState *machine)
         exit(EXIT_FAILURE);
     }
 
-    s = sa1110_init(machine->cpu_type);
+    cms->sa1110 = sa1110_init(machine->cpu_type);
 
     memory_region_add_subregion(get_system_memory(), SA_SDCS0, machine->ram);
 
@@ -54,11 +64,13 @@  static void collie_init(MachineState *machine)
     sysbus_create_simple("scoop", 0x40800000, NULL);
 
     collie_binfo.board_id = 0x208;
-    arm_load_kernel(s->cpu, machine, &collie_binfo);
+    arm_load_kernel(cms->sa1110->cpu, machine, &collie_binfo);
 }
 
-static void collie_machine_init(MachineClass *mc)
+static void collie_machine_class_init(ObjectClass *oc, void *data)
 {
+    MachineClass *mc = MACHINE_CLASS(oc);
+
     mc->desc = "Sharp SL-5500 (Collie) PDA (SA-1110)";
     mc->init = collie_init;
     mc->ignore_memory_transaction_failures = true;
@@ -67,4 +79,15 @@  static void collie_machine_init(MachineClass *mc)
     mc->default_ram_id = "strongarm.sdram";
 }
 
-DEFINE_MACHINE("collie", collie_machine_init)
+static const TypeInfo collie_machine_typeinfo = {
+    .name = TYPE_COLLIE_MACHINE,
+    .parent = TYPE_MACHINE,
+    .class_init = collie_machine_class_init,
+    .instance_size = sizeof(CollieMachineState),
+};
+
+static void collie_machine_register_types(void)
+{
+    type_register_static(&collie_machine_typeinfo);
+}
+type_init(collie_machine_register_types);