rng: remove the unused request cancellation code

rng_backend_cancel_requests had no callers and none of the code
deleted in this commit ever ran.
Signed-off-by: NLadi Prosek <lprosek@redhat.com>
Reviewed-by: NAmit Shah <amit.shah@redhat.com>
Message-Id: <1456994238-9585-2-git-send-email-lprosek@redhat.com>
Signed-off-by: NAmit Shah <amit.shah@redhat.com>

backends/rng-egd.c

@@ -125,17 +125,6 @@ static void rng_egd_free_requests(RngEgd *s)
     s->requests = NULL;
 }
 
-static void rng_egd_cancel_requests(RngBackend *b)
-{
-    RngEgd *s = RNG_EGD(b);
-
-    /* We simply delete the list of pending requests.  If there is data in the 
-     * queue waiting to be read, this is okay, because there will always be
-     * more data than we requested originally
-     */
-    rng_egd_free_requests(s);
-}
-
 static void rng_egd_opened(RngBackend *b, Error **errp)
 {
     RngEgd *s = RNG_EGD(b);
@@ -213,7 +202,6 @@ static void rng_egd_class_init(ObjectClass *klass, void *data)
     RngBackendClass *rbc = RNG_BACKEND_CLASS(klass);
 
     rbc->request_entropy = rng_egd_request_entropy;
-    rbc->cancel_requests = rng_egd_cancel_requests;
     rbc->opened = rng_egd_opened;
 }
 

backends/rng.c

@@ -26,15 +26,6 @@ void rng_backend_request_entropy(RngBackend *s, size_t size,
     }
 }
 
-void rng_backend_cancel_requests(RngBackend *s)
-{
-    RngBackendClass *k = RNG_BACKEND_GET_CLASS(s);
-
-    if (k->cancel_requests) {
-        k->cancel_requests(s);
-    }
-}
-
 static bool rng_backend_prop_get_opened(Object *obj, Error **errp)
 {
     RngBackend *s = RNG_BACKEND(obj);

include/sysemu/rng.h

@@ -37,7 +37,6 @@ struct RngBackendClass
 
     void (*request_entropy)(RngBackend *s, size_t size,
                             EntropyReceiveFunc *receive_entropy, void *opaque);
-    void (*cancel_requests)(RngBackend *s);
 
     void (*opened)(RngBackend *s, Error **errp);
 };
@@ -68,14 +67,4 @@ struct RngBackend
 void rng_backend_request_entropy(RngBackend *s, size_t size,
                                  EntropyReceiveFunc *receive_entropy,
                                  void *opaque);
-
-/**
- * rng_backend_cancel_requests:
- * @s: the backend to cancel all pending requests in
- *
- * Cancels all pending requests submitted by @rng_backend_request_entropy.  This
- * should be used by a device during reset or in preparation for live migration
- * to stop tracking any request.
- */
-void rng_backend_cancel_requests(RngBackend *s);
 #endif