hw/arm/palm.c: Encapsulate misc GPIO handling in a device

Replace the free-floating set of IRQs and palmte_onoff_gpios()
function with a simple QOM device that encapsulates this
behaviour.

This fixes Coverity issue CID 1421944, which points out that
the memory returned by qemu_allocate_irqs() is leaked.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20200628214230.2592-3-peter.maydell@linaro.org

hw/arm/palm.c

@@ -124,6 +124,21 @@ static void palmte_button_event(void *opaque, int keycode)
                         !(keycode & 0x80));
 }
 
+/*
+ * Encapsulation of some GPIO line behaviour for the Palm board
+ *
+ * QEMU interface:
+ *  + unnamed GPIO inputs 0..6: for the various miscellaneous input lines
+ */
+
+#define TYPE_PALM_MISC_GPIO "palm-misc-gpio"
+#define PALM_MISC_GPIO(obj) \
+    OBJECT_CHECK(PalmMiscGPIOState, (obj), TYPE_PALM_MISC_GPIO)
+
+typedef struct PalmMiscGPIOState {
+    SysBusDevice parent_obj;
+} PalmMiscGPIOState;
+
 static void palmte_onoff_gpios(void *opaque, int line, int level)
 {
     switch (line) {
@@ -151,23 +166,44 @@ static void palmte_onoff_gpios(void *opaque, int line, int level)
     }
 }
 
+static void palm_misc_gpio_init(Object *obj)
+{
+    DeviceState *dev = DEVICE(obj);
+
+    qdev_init_gpio_in(dev, palmte_onoff_gpios, 7);
+}
+
+static const TypeInfo palm_misc_gpio_info = {
+    .name = TYPE_PALM_MISC_GPIO,
+    .parent = TYPE_SYS_BUS_DEVICE,
+    .instance_size = sizeof(PalmMiscGPIOState),
+    .instance_init = palm_misc_gpio_init,
+    /*
+     * No class init required: device has no internal state so does not
+     * need to set up reset or vmstate, and has no realize method.
+     */
+};
+
 static void palmte_gpio_setup(struct omap_mpu_state_s *cpu)
 {
-    qemu_irq *misc_gpio;
+    DeviceState *misc_gpio;
+
+    misc_gpio = sysbus_create_simple(TYPE_PALM_MISC_GPIO, -1, NULL);
 
     omap_mmc_handlers(cpu->mmc,
                     qdev_get_gpio_in(cpu->gpio, PALMTE_MMC_WP_GPIO),
                     qemu_irq_invert(omap_mpuio_in_get(cpu->mpuio)
                             [PALMTE_MMC_SWITCH_GPIO]));
 
-    misc_gpio = qemu_allocate_irqs(palmte_onoff_gpios, cpu, 7);
-    qdev_connect_gpio_out(cpu->gpio, PALMTE_MMC_POWER_GPIO,     misc_gpio[0]);
-    qdev_connect_gpio_out(cpu->gpio, PALMTE_SPEAKER_GPIO,       misc_gpio[1]);
-    qdev_connect_gpio_out(cpu->gpio, 11,                        misc_gpio[2]);
-    qdev_connect_gpio_out(cpu->gpio, 12,                        misc_gpio[3]);
-    qdev_connect_gpio_out(cpu->gpio, 13,                        misc_gpio[4]);
-    omap_mpuio_out_set(cpu->mpuio, 1,                           misc_gpio[5]);
-    omap_mpuio_out_set(cpu->mpuio, 3,                           misc_gpio[6]);
+    qdev_connect_gpio_out(cpu->gpio, PALMTE_MMC_POWER_GPIO,
+                          qdev_get_gpio_in(misc_gpio, 0));
+    qdev_connect_gpio_out(cpu->gpio, PALMTE_SPEAKER_GPIO,
+                          qdev_get_gpio_in(misc_gpio, 1));
+    qdev_connect_gpio_out(cpu->gpio, 11, qdev_get_gpio_in(misc_gpio, 2));
+    qdev_connect_gpio_out(cpu->gpio, 12, qdev_get_gpio_in(misc_gpio, 3));
+    qdev_connect_gpio_out(cpu->gpio, 13, qdev_get_gpio_in(misc_gpio, 4));
+    omap_mpuio_out_set(cpu->mpuio, 1, qdev_get_gpio_in(misc_gpio, 5));
+    omap_mpuio_out_set(cpu->mpuio, 3, qdev_get_gpio_in(misc_gpio, 6));
 
     /* Reset some inputs to initial state.  */
     qemu_irq_lower(qdev_get_gpio_in(cpu->gpio, PALMTE_USBDETECT_GPIO));
@@ -276,3 +312,10 @@ static void palmte_machine_init(MachineClass *mc)
 }
 
 DEFINE_MACHINE("cheetah", palmte_machine_init)
+
+static void palm_register_types(void)
+{
+    type_register_static(&palm_misc_gpio_info);
+}
+
+type_init(palm_register_types)