[libvirt] PATCH: Fix thread safety with HAL driver restart

[Daniel P. Berrange]

The restart method of the HAL implementation of node device is not 
currently threadsafe, because it destroys and creates the entire
driver, including its mutexes. This patch changes it to simply throw
away all existing devices, and re-load them from dbus.

Daniel

diff -r 625ffe1918a4 src/node_device_hal.c
--- a/src/node_device_hal.c	Thu May 21 15:56:27 2009 +0100
+++ b/src/node_device_hal.c	Thu May 21 15:56:33 2009 +0100
@@ -785,10 +785,28 @@ static int halDeviceMonitorShutdown(void
 
 static int halDeviceMonitorReload(void)
 {
-    /* XXX This isn't thread safe because its free'ing the thing
-     * we're locking */
-    (void)halDeviceMonitorShutdown();
-    return halDeviceMonitorStartup();
+    DBusError err;
+    char **udi = NULL;
+    int num_devs, i;
+    LibHalContext *hal_ctx;
+
+    nodeDeviceLock(driverState);
+    virNodeDeviceObjListFree(&driverState->devs);
+    nodeDeviceUnlock(driverState);
+
+    hal_ctx = DRV_STATE_HAL_CTX(driverState);
+    udi = libhal_get_all_devices(hal_ctx, &num_devs, &err);
+    if (udi == NULL) {
+        fprintf(stderr, "%s: libhal_get_all_devices failed\n", __FUNCTION__);
+        return -1;
+    }
+    for (i = 0; i < num_devs; i++) {
+        dev_create(udi[i]);
+        VIR_FREE(udi[i]);
+    }
+    VIR_FREE(udi);
+
+    return 0;
 }
 
 


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