This patch is submitted upstream and can be removed when it hits compat-wireless.

--mb



--- a/drivers/net/wireless/b43/b43.h
+++ b/drivers/net/wireless/b43/b43.h
@@ -624,9 +624,11 @@ struct b43_wl {
 	/* Stats about the wireless interface */
 	struct ieee80211_low_level_stats ieee_stats;
 
+#ifdef CONFIG_B43_HWRNG
 	struct hwrng rng;
-	u8 rng_initialized;
+	bool rng_initialized;
 	char rng_name[30 + 1];
+#endif /* CONFIG_B43_HWRNG */
 
 	/* The RF-kill button */
 	struct b43_rfkill rfkill;
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -2982,6 +2982,7 @@ static void b43_security_init(struct b43
 	b43_clear_keys(dev);
 }
 
+#ifdef CONFIG_B43_HWRNG
 static int b43_rng_read(struct hwrng *rng, u32 *data)
 {
 	struct b43_wl *wl = (struct b43_wl *)rng->priv;
@@ -2997,17 +2998,21 @@ static int b43_rng_read(struct hwrng *rn
 
 	return (sizeof(u16));
 }
+#endif /* CONFIG_B43_HWRNG */
 
 static void b43_rng_exit(struct b43_wl *wl)
 {
+#ifdef CONFIG_B43_HWRNG
 	if (wl->rng_initialized)
 		hwrng_unregister(&wl->rng);
+#endif /* CONFIG_B43_HWRNG */
 }
 
 static int b43_rng_init(struct b43_wl *wl)
 {
-	int err;
+	int err = 0;
 
+#ifdef CONFIG_B43_HWRNG
 	snprintf(wl->rng_name, ARRAY_SIZE(wl->rng_name),
 		 "%s_%s", KBUILD_MODNAME, wiphy_name(wl->hw->wiphy));
 	wl->rng.name = wl->rng_name;
@@ -3020,6 +3025,7 @@ static int b43_rng_init(struct b43_wl *w
 		b43err(wl, "Failed to register the random "
 		       "number generator (%d)\n", err);
 	}
+#endif /* CONFIG_B43_HWRNG */
 
 	return err;
 }
--- a/config.mk
+++ b/config.mk
@@ -148,6 +148,7 @@ CONFIG_ATH9K_DEBUG=y
 # CONFIG_B43_PIO=y
 # CONFIG_B43_LEDS=y
 # CONFIG_B43_RFKILL=y
+# CONFIG_B43_HWRNG=y
 # CONFIG_B43_DEBUG=y
 # CONFIG_B43_FORCE_PIO=y