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    Subject[PATCH 4.19 341/346] xen/xenbus/xen_bus_type: Support will_handle watch callback
    Date
    From: SeongJae Park <sjpark@amazon.de>

    commit be987200fbaceaef340872841d4f7af2c5ee8dc3 upstream.

    This commit adds support of the 'will_handle' watch callback for
    'xen_bus_type' users.

    This is part of XSA-349

    Cc: stable@vger.kernel.org
    Signed-off-by: SeongJae Park <sjpark@amazon.de>
    Reported-by: Michael Kurth <mku@amazon.de>
    Reported-by: Pawel Wieczorkiewicz <wipawel@amazon.de>
    Reviewed-by: Juergen Gross <jgross@suse.com>
    Signed-off-by: Juergen Gross <jgross@suse.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/xen/xenbus/xenbus.h | 2 ++
    drivers/xen/xenbus/xenbus_probe.c | 3 ++-
    2 files changed, 4 insertions(+), 1 deletion(-)

    --- a/drivers/xen/xenbus/xenbus.h
    +++ b/drivers/xen/xenbus/xenbus.h
    @@ -44,6 +44,8 @@ struct xen_bus_type {
    int (*get_bus_id)(char bus_id[XEN_BUS_ID_SIZE], const char *nodename);
    int (*probe)(struct xen_bus_type *bus, const char *type,
    const char *dir);
    + bool (*otherend_will_handle)(struct xenbus_watch *watch,
    + const char *path, const char *token);
    void (*otherend_changed)(struct xenbus_watch *watch, const char *path,
    const char *token);
    struct bus_type bus;
    --- a/drivers/xen/xenbus/xenbus_probe.c
    +++ b/drivers/xen/xenbus/xenbus_probe.c
    @@ -136,7 +136,8 @@ static int watch_otherend(struct xenbus_
    container_of(dev->dev.bus, struct xen_bus_type, bus);

    return xenbus_watch_pathfmt(dev, &dev->otherend_watch,
    - NULL, bus->otherend_changed,
    + bus->otherend_will_handle,
    + bus->otherend_changed,
    "%s/%s", dev->otherend, "state");
    }


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