Changeset 4960 in vbox for trunk/src/VBox/HostDrivers/Support/win

Timestamp:

Sep 21, 2007 2:58:57 PM (18 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

24719

Message:

Raise IRQL to DISPATCH_LEVEL to prevent Windows from rescheduling us to a different CPU.

File:

• trunk/src/VBox/HostDrivers/Support/win/SUPDrv-win.cpp (modified) (1 diff)

trunk/src/VBox/HostDrivers/Support/win/SUPDrv-win.cpp

@@ -280 +280 @@
         ||  ulCmd == SUP_IOCTL_FAST_DO_NOP)
     {
-        int rc = supdrvIOCtlFast(ulCmd, pDevExt, pSession);
+        KIRQL oldIrql;
+        int   rc;
+
+                /* Raise the IRQL to DISPATCH_LEVEl to prevent Windows from rescheduling us to another CPU/core. */ 
+                Assert(KeGetCurrentIrql() <= DISPATCH_LEVEL);
+                KeRaiseIrql(DISPATCH_LEVEL, &oldIrql);        
+        rc = supdrvIOCtlFast(ulCmd, pDevExt, pSession);
+        KeLowerIrql(oldIrql);
 
         /* Complete the I/O request. */