[Qemu-devel] [PATCH] Return contorl to host on usb_del monitor command

[Shahar Havivi <shaharh@redhat.com>]

When removing usb on guest via usb_del monitor command, qemu does
not return the control to the host, the only solution user have is to
unplug/plug the device again in order to get the device back to the host

Signed-off-by: Shahar Havivi <shaharh@redhat.com>
---
 hw/usb-bus.c |    4 ++++
 hw/usb.h     |    1 +
 usb-linux.c  |   11 +++++++++++
 3 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/hw/usb-bus.c b/hw/usb-bus.c
index ee0e9e3..9781ac6 100644
--- a/hw/usb-bus.c
+++ b/hw/usb-bus.c
@@ -208,6 +208,10 @@ int usb_device_delete_addr(int busnr, int addr)
         return -1;
     dev = port->dev;
 
+    if (!strcmp(dev->info->usbdevice_name, "host")) {
+        usb_host_device_release(dev);
+    }
+
     qdev_free(&dev->qdev);
     return 0;
 }
diff --git a/hw/usb.h b/hw/usb.h
index 00d2802..f6f7cc4 100644
--- a/hw/usb.h
+++ b/hw/usb.h
@@ -258,6 +258,7 @@ void usb_send_msg(USBDevice *dev, int msg);
 USBDevice *usb_host_device_open(const char *devname);
 int usb_host_device_close(const char *devname);
 void usb_host_info(Monitor *mon);
+int usb_host_device_release(USBDevice *dev);
 
 /* usb-hid.c */
 void usb_hid_datain_cb(USBDevice *dev, void *opaque, void (*datain)(void *));
diff --git a/usb-linux.c b/usb-linux.c
index d0d7cff..9db94dd 100644
--- a/usb-linux.c
+++ b/usb-linux.c
@@ -284,6 +284,17 @@ static void async_cancel(USBPacket *unused, void *opaque)
     }
 }
 
+/* release usb device, return control to host */
+int usb_host_device_release(USBDevice *dev)
+{
+    int ret;
+
+    USBHostDevice *s = DO_UPCAST(USBHostDevice, dev, dev);
+    ret = ioctl(s->fd, USBDEVFS_RESET);
+
+    return ret;
+}
+
 static int usb_host_claim_interfaces(USBHostDevice *dev, int configuration)
 {
     int dev_descr_len, config_descr_len;
-- 
1.6.3.3