diff options
Diffstat (limited to 'libusb/hotplug.c')
| -rw-r--r-- | libusb/hotplug.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/libusb/hotplug.c b/libusb/hotplug.c index 9171f2c..3ac159f 100644 --- a/libusb/hotplug.c +++ b/libusb/hotplug.c @@ -206,6 +206,7 @@ void usbi_hotplug_match(struct libusb_context *ctx, struct libusb_device *dev, void usbi_hotplug_notification(struct libusb_context *ctx, struct libusb_device *dev, libusb_hotplug_event event) { + int pending_events;; libusb_hotplug_message *message = calloc(1, sizeof(*message)); if (!message) { @@ -216,12 +217,14 @@ void usbi_hotplug_notification(struct libusb_context *ctx, struct libusb_device message->event = event; message->device = dev; - /* Take the event data lock and add this message to the list. */ + /* Take the event data lock and add this message to the list. + * Only signal an event if there are no prior pending events. */ usbi_mutex_lock(&ctx->event_data_lock); + pending_events = usbi_pending_events(ctx); list_add_tail(&message->list, &ctx->hotplug_msgs); + if (!pending_events) + usbi_signal_event(ctx); usbi_mutex_unlock(&ctx->event_data_lock); - - usbi_signal_event(ctx); } int API_EXPORTED libusb_hotplug_register_callback(libusb_context *ctx, |