[Xen-changelog] [xen stable-4.6] libxl: fix the cleanup of the backend path when using driver domains

[patchbot@xxxxxxx]

commit 7472ced461b4c4480a6dee2753a266f98e791456
Author:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
AuthorDate: Wed Sep 23 12:06:56 2015 +0200
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Thu Sep 24 11:43:31 2015 +0100

    libxl: fix the cleanup of the backend path when using driver domains

    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 Monné <roger.pau@xxxxxxxxxx>
    Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
    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>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    (cherry picked from commit 546678c6a60f64fb186640460dfa69a837c8fba5)
---
 tools/libxl/libxl_device.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c
index 85a3662..8bb5e93 100644
--- a/tools/libxl/libxl_device.c
+++ b/tools/libxl/libxl_device.c
@@ -591,15 +591,15 @@ int libxl__device_destroy(libxl__gc *gc, libxl__device 
*dev)

         if (domid == LIBXL_TOOLSTACK_DOMID) {
             /*
-             * The toolstack domain is in charge for removing both the
-             * frontend and the backend path
+             * The toolstack domain is in charge of removing the
+             * frontend 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
+             * The driver domain is in charge of removing what it can
+             * from the backend path.
              */
             libxl__xs_path_cleanup(gc, t, be_path);
         }
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.6

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