[Xen-devel] [PATCH for-4.6 2/2] libxl: fix the cleanup of the backend path when using driver domains

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

With the current libxl implementation the control domain will remove both
the frontend and the backend xenstore paths of a device that's handled by a
driver domain. This is incorrect, since the driver domain possibly needs to
access the backend path in order to perform the disconnection and cleanup of
the device.

Fix this by making sure the control domain only cleans the frontend path,
leaving the backend path to be cleaned by the driver domain. Note that if
the device is not handled by a driver domain the control domain will perform
the removal of both the frontend and the backend paths.

Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
Reported-by: Alex Velazquez <alex.j.velazquez@xxxxxxxxx>
Cc: Alex Velazquez <alex.j.velazquez@xxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 tools/libxl/libxl_device.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c
index 51da10e..6035c6e 100644
--- a/tools/libxl/libxl_device.c
+++ b/tools/libxl/libxl_device.c
@@ -595,8 +595,8 @@ int libxl__device_destroy(libxl__gc *gc, libxl__device *dev)
              * frontend and the backend path
              */
             libxl__xs_path_cleanup(gc, t, fe_path);
-            libxl__xs_path_cleanup(gc, t, be_path);
-        } else if (dev->backend_domid == domid) {
+        }
+        if (dev->backend_domid == domid) {
             /*
              * The driver domain is in charge for removing what it can
              * from the backend path
-- 
1.9.5 (Apple Git-50.3)


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