husb: support for USB host device auto disconnect (Max Krasnyansky)

I got really annoyed by the fact that you have to manually do
usb_del in the monitor when host device is unplugged and decided
to fix it :)

Basically we now automatically remove guest USB device
when the actual host device is disconnected.

At first I've extended set_fd_handlerX() stuff to support checking
for exceptions on fds. But unfortunately usbfs code does not wake up
user-space process when device is removed, which means we need a
timer to periodically check if device is still there. So I removed
fd exception stuff and implemented it with the timer.

Signed-off-by: Max Krasnyansky <maxk@kernel.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5047 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 18 insertions, 8 deletions

diff --git a/vl.c b/vl.c
index 39503a3929..22242489dd 100644
--- a/vl.c
+++ b/vl.c
@@ -5809,22 +5809,15 @@ static int usb_device_add(const char *devname)
     return 0;
 }
 
-static int usb_device_del(const char *devname)
+int usb_device_del_addr(int bus_num, int addr)
 {
     USBPort *port;
     USBPort **lastp;
     USBDevice *dev;
-    int bus_num, addr;
-    const char *p;
 
     if (!used_usb_ports)
         return -1;
 
-    p = strchr(devname, '.');
-    if (!p)
-        return -1;
-    bus_num = strtoul(devname, NULL, 0);
-    addr = strtoul(p + 1, NULL, 0);
     if (bus_num != 0)
         return -1;
 
@@ -5847,6 +5840,23 @@ static int usb_device_del(const char *devname)
     return 0;
 }
 
+static int usb_device_del(const char *devname)
+{
+    int bus_num, addr;
+    const char *p;
+
+    if (!used_usb_ports)
+        return -1;
+
+    p = strchr(devname, '.');
+    if (!p)
+        return -1;
+    bus_num = strtoul(devname, NULL, 0);
+    addr = strtoul(p + 1, NULL, 0);
+
+    return usb_device_del_addr(bus_num, addr);
+}
+
 void do_usb_add(const char *devname)
 {
     int ret;