From: Owen Smith <owen.smith@citrix.com>
Date: Fri, 2 Mar 2018 13:23:37 +0000 (+0000)
Subject: Fail FrontendPrepare if backend	doesn't re-initialize
X-Git-Tag: 9.0.0-rc1~16
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=cbb284d59dcca77fe1e47be4d5dba474d5c798a2;p=pvdrivers%2Fwin%2Fxencons.git

Fail FrontendPrepare if backend	doesn't re-initialize

Current backend will crash (taking out the VM) if any attempt is
made to reconnect to a backend that has transitioned to the
Closed state. Forces the frontend offline, which will fail the
frontend state transitions, and its initiating IRP.

Signed-off-by: Owen Smith <owen.smith@citrix.com>
---

diff --git a/src/xencons/frontend.c b/src/xencons/frontend.c
index eb8e3fe..6965092 100644
--- a/src/xencons/frontend.c
+++ b/src/xencons/frontend.c
@@ -652,6 +652,12 @@ FrontendPrepare(
         case XenbusStateClosed:
             FrontendSetXenbusState(Frontend,
                                    XenbusStateClosed);
+            // There is currently a bug in the backend.
+            // Once the backend reaches Closed, it will crash the
+            // frontend attempts to make any state transition.
+            // Avoid the bug by forcing the frontend offline and
+            // failing FrontendPrepare
+            FrontendSetOffline(Frontend);
             break;
         default:
             FrontendSetXenbusState(Frontend,