[PATCH spice-gtk v2 02/33] fixup! usb-redir: define interfaces to support emulated devices

[Frediano Ziglio <fziglio@xxxxxxxxxx>]

Change reference counting semantic for emulated devices.
Make the same as not emulated.
This fix a leak if spice_usb_backend_device_eject is not called.
Consistently the reference counter for SpiceUsbBackendDevice is
now the number of owning pointers.
---
 src/usb-backend.c   | 19 ++++++++++---------
 src/usb-emulation.h |  2 +-
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/src/usb-backend.c b/src/usb-backend.c
index d80da177..de2b55ec 100644
--- a/src/usb-backend.c
+++ b/src/usb-backend.c
@@ -852,17 +852,17 @@ void spice_usb_backend_device_report_change(SpiceUsbBackend *be,
 
 void spice_usb_backend_device_eject(SpiceUsbBackend *be, SpiceUsbBackendDevice *dev)
 {
-    g_return_if_fail(dev && dev->edev);
+    g_return_if_fail(dev);
 
+    if (dev->edev) {
+        be->own_devices_mask &= ~(1 << dev->device_info.address);
+    }
     if (be->hotplug_callback) {
         be->hotplug_callback(be->hotplug_user_data, dev, FALSE);
     }
-    be->own_devices_mask &= ~(1 << dev->device_info.address);
-
-    spice_usb_backend_device_unref(dev);
 }
 
-SpiceUsbBackendDevice*
+gboolean
 spice_usb_backend_create_emulated_device(SpiceUsbBackend *be,
                                          SpiceUsbEmulatedDeviceCreate create_proc,
                                          void *create_params,
@@ -877,7 +877,7 @@ spice_usb_backend_create_emulated_device(SpiceUsbBackend *be,
     if (be->own_devices_mask == 0xffffffff) {
         g_set_error(err, SPICE_CLIENT_ERROR, SPICE_CLIENT_ERROR_FAILED,
                     _("can't create device - limit reached"));
-        return NULL;
+        return FALSE;
     }
     for (address = 0; address < 32; ++address) {
         if (~be->own_devices_mask & (1 << address)) {
@@ -893,7 +893,7 @@ spice_usb_backend_create_emulated_device(SpiceUsbBackend *be,
     dev->edev = edev = create_proc(be, dev, create_params, err);
     if (edev == NULL) {
         spice_usb_backend_device_unref(dev);
-        return NULL;
+        return FALSE;
     }
 
     if (!device_ops(edev)->get_descriptor(edev, LIBUSB_DT_DEVICE, 0,
@@ -903,7 +903,7 @@ spice_usb_backend_create_emulated_device(SpiceUsbBackend *be,
         spice_usb_backend_device_unref(dev);
         g_set_error(err, SPICE_CLIENT_ERROR, SPICE_CLIENT_ERROR_FAILED,
                     _("can't create device - internal error"));
-        return NULL;
+        return FALSE;
     }
 
     be->own_devices_mask |= 1 << address;
@@ -918,8 +918,9 @@ spice_usb_backend_create_emulated_device(SpiceUsbBackend *be,
     if (be->hotplug_callback) {
         be->hotplug_callback(be->hotplug_user_data, dev, TRUE);
     }
+    spice_usb_backend_device_unref(dev);
 
-    return dev;
+    return TRUE;
 }
 
 #endif /* USB_REDIR */
diff --git a/src/usb-emulation.h b/src/usb-emulation.h
index 9e626a24..46d54d47 100644
--- a/src/usb-emulation.h
+++ b/src/usb-emulation.h
@@ -80,7 +80,7 @@ static inline const UsbDeviceOps *device_ops(SpiceUsbEmulatedDevice *dev)
     return (const UsbDeviceOps *)dev;
 }
 
-SpiceUsbBackendDevice*
+gboolean
 spice_usb_backend_create_emulated_device(SpiceUsbBackend *be,
                                          SpiceUsbEmulatedDeviceCreate create_proc,
                                          void *create_params,
-- 
2.20.1

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