xenbus: simplify xenbus_dev_request_and_reply()

No need to retain a local copy of the full request message, only the
type is really needed.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

diff --git a/drivers/xen/xenbus/xenbus_xs.c b/drivers/xen/xenbus/xenbus_xs.c
index 0bd3d47..22f7cd7 100644 (file)
--- a/drivers/xen/xenbus/xenbus_xs.c
+++ b/drivers/xen/xenbus/xenbus_xs.c
@@ -232,10 +232,10 @@ static void transaction_resume(void)
 void *xenbus_dev_request_and_reply(struct xsd_sockmsg *msg)
 {
        void *ret;
-       struct xsd_sockmsg req_msg = *msg;
+       enum xsd_sockmsg_type type = msg->type;
        int err;
 
-       if (req_msg.type == XS_TRANSACTION_START)
+       if (type == XS_TRANSACTION_START)
                transaction_start();
 
        mutex_lock(&xs_state.request_mutex);
@@ -250,8 +250,7 @@ void *xenbus_dev_request_and_reply(struct xsd_sockmsg *msg)
        mutex_unlock(&xs_state.request_mutex);
 
        if ((msg->type == XS_TRANSACTION_END) ||
-           ((req_msg.type == XS_TRANSACTION_START) &&
-            (msg->type == XS_ERROR)))
+           ((type == XS_TRANSACTION_START) && (msg->type == XS_ERROR)))
                transaction_end();
 
        return ret;