Changeset 55657 in vbox for trunk/src

Timestamp:

May 5, 2015 11:22:57 AM (10 years ago)

Author:

vboxsync

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

100043

Message:

NetShaper: Fallback to R3 if there is no underlying R0 (#5582).

File:

• trunk/src/VBox/Devices/Network/DrvNetShaper.cpp (modified) (1 diff)

trunk/src/VBox/Devices/Network/DrvNetShaper.cpp

@@ -297 +297 @@
 {
     PDRVNETSHAPER pThis = RT_FROM_MEMBER(pInterface, DRVNETSHAPER, IBaseR0);
-    PDMIBASER0_RETURN_INTERFACE(pThis->pDrvInsR3, pszIID, PDMINETWORKUP, &pThis->INetworkUpR0);
+    /*
+     * We need to check if the underlying driver supports R0. If it does not,
+     * then it is useless and even harmful to support R0 here, as we will end up
+     * returning errors when a network adapter tries to allocate a buffer in R0.
+     */
+    if (pThis->pIBelowNetR0)
+        PDMIBASER0_RETURN_INTERFACE(pThis->pDrvInsR3, pszIID, PDMINETWORKUP, &pThis->INetworkUpR0);
     return NIL_RTR0PTR;
 }