vfio/iommufd: add vfio_device_free_name

Define vfio_device_free_name to free the name created by
vfio_device_get_name.  A subsequent patch will do more there.
No functional change.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/1751493538-202042-11-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

Author: Steve Sistare

hw/vfio/ap.c

@@ -265,7 +265,7 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp)
 
 error:
     error_prepend(errp, VFIO_MSG_PREFIX, vbasedev->name);
-    g_free(vbasedev->name);
+    vfio_device_free_name(vbasedev);
 }
 
 static void vfio_ap_unrealize(DeviceState *dev)
@@ -275,7 +275,7 @@ static void vfio_ap_unrealize(DeviceState *dev)
     vfio_ap_unregister_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX);
     vfio_ap_unregister_irq_notifier(vapdev, VFIO_AP_CFG_CHG_IRQ_INDEX);
     vfio_device_detach(&vapdev->vdev);
-    g_free(vapdev->vdev.name);
+    vfio_device_free_name(&vapdev->vdev);
 }
 
 static const Property vfio_ap_properties[] = {

hw/vfio/ccw.c

@@ -619,7 +619,7 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
 out_region_err:
     vfio_device_detach(vbasedev);
 out_attach_dev_err:
-    g_free(vbasedev->name);
+    vfio_device_free_name(vbasedev);
 out_unrealize:
     if (cdc->unrealize) {
         cdc->unrealize(cdev);
@@ -637,7 +637,7 @@ static void vfio_ccw_unrealize(DeviceState *dev)
     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
     vfio_ccw_put_region(vcdev);
     vfio_device_detach(&vcdev->vdev);
-    g_free(vcdev->vdev.name);
+    vfio_device_free_name(&vcdev->vdev);
 
     if (cdc->unrealize) {
         cdc->unrealize(cdev);

hw/vfio/device.c

@@ -333,6 +333,11 @@ bool vfio_device_get_name(VFIODevice *vbasedev, Error **errp)
     return true;
 }
 
+void vfio_device_free_name(VFIODevice *vbasedev)
+{
+    g_clear_pointer(&vbasedev->name, g_free);
+}
+
 void vfio_device_set_fd(VFIODevice *vbasedev, const char *str, Error **errp)
 {
     ERRP_GUARD();

hw/vfio/pci.c

@@ -2996,7 +2996,7 @@ void vfio_pci_put_device(VFIOPCIDevice *vdev)
 
     vfio_device_detach(&vdev->vbasedev);
 
-    g_free(vdev->vbasedev.name);
+    vfio_device_free_name(&vdev->vbasedev);
     g_free(vdev->msix);
 }
 

hw/vfio/platform.c

@@ -530,7 +530,7 @@ static bool vfio_base_device_init(VFIODevice *vbasedev, Error **errp)
 {
     /* @fd takes precedence over @sysfsdev which takes precedence over @host */
     if (vbasedev->fd < 0 && vbasedev->sysfsdev) {
-        g_free(vbasedev->name);
+        vfio_device_free_name(vbasedev);
         vbasedev->name = g_path_get_basename(vbasedev->sysfsdev);
     } else if (vbasedev->fd < 0) {
         if (!vbasedev->name || strchr(vbasedev->name, '/')) {

include/hw/vfio/vfio-device.h

@@ -279,6 +279,7 @@ int vfio_device_get_irq_info(VFIODevice *vbasedev, int index,
 
 /* Returns 0 on success, or a negative errno. */
 bool vfio_device_get_name(VFIODevice *vbasedev, Error **errp);
+void vfio_device_free_name(VFIODevice *vbasedev);
 void vfio_device_set_fd(VFIODevice *vbasedev, const char *str, Error **errp);
 void vfio_device_init(VFIODevice *vbasedev, int type, VFIODeviceOps *ops,
                       DeviceState *dev, bool ram_discard);