Re: [Qemu-devel] [PATCH] Fix hanging user monitor when using balloon command

[Adam Litke <agl@us.ibm.com>]

On Fri, 2010-02-19 at 15:47 -0600, Anthony Liguori wrote:
> On 02/12/2010 02:55 PM, Adam Litke wrote:
> > Arghh... Adding missing S-O-B
> >
> > Hi Anthony.  I wonder if there was a problem when importing my async
> > command handler patchset.  Since the 'balloon' command completes
> > immediately, it must call the completion callback before returning.
> > That call was missing but is added by the patch below.
> >
> > Signed-off-by: Adam Litke<agl@us.ibm.com>
> >    
> 
> Applied.  Thanks.

This patch application failed.  My patch adds a cb() call in
do_balloon(), but the change in git has added the cb() call to
do_info_balloon().  That is causing qemu segfaults.  Applying the
following should correct the damage.  Thanks.

Fix for commit: 5c366a8a3d7ac71beda8499caa815cb3ea95eb58

The cb() call is needed in do_balloon(), not do_info_balloon().

Signed-off-by: Adam Litke <agl@us.ibm.com>

diff --git a/monitor.c b/monitor.c
index b1a6edc..c7d2117 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2309,7 +2309,6 @@ static int do_info_balloon(Monitor *mon, MonitorCompletion cb, void *opaque)
         return -1;
     }
 
-    cb(opaque, NULL);
     return 0;
 }
 
@@ -2332,6 +2331,7 @@ static int do_balloon(Monitor *mon, const QDict *params,
         return -1;
     }
 
+    cb(opaque, NULL);
     return 0;
 }
 



-- 
Thanks,
Adam