b43legacy: Do not select HW_RANDOM

Auto-depend on HW_RANDOM, rather than "select"ing it.
This way the user has the choice to enable or disable HWRNG support.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43legacy/Kconfig

@@ -3,7 +3,6 @@ config B43LEGACY
 	depends on SSB_POSSIBLE && MAC80211 && WLAN_80211 && HAS_DMA
 	select SSB
 	select FW_LOADER
-	select HW_RANDOM
 	---help---
 	  b43legacy is a driver for 802.11b devices from Broadcom (BCM4301 and
 	  BCM4303) and early model 802.11g chips (BCM4306 Ver. 2) used in the
@@ -51,6 +50,13 @@ config B43LEGACY_RFKILL
 	depends on B43LEGACY && (RFKILL = y || RFKILL = B43LEGACY) && RFKILL_INPUT && (INPUT_POLLDEV = y || INPUT_POLLDEV = B43LEGACY)
 	default y
 
+# This config option automatically enables b43 HW-RNG support,
+# if the HW-RNG core is enabled.
+config B43LEGACY_HWRNG
+	bool
+	depends on B43LEGACY && (HW_RANDOM = y || HW_RANDOM = B43LEGACY)
+	default y
+
 config B43LEGACY_DEBUG
 	bool "Broadcom 43xx-legacy debugging"
 	depends on B43LEGACY

drivers/net/wireless/b43legacy/b43legacy.h

@@ -596,9 +596,11 @@ struct b43legacy_wl {
 	/* Stats about the wireless interface */
 	struct ieee80211_low_level_stats ieee_stats;
 
+#ifdef CONFIG_B43LEGACY_HWRNG
 	struct hwrng rng;
 	u8 rng_initialized;
 	char rng_name[30 + 1];
+#endif
 
 	/* The RF-kill button */
 	struct b43legacy_rfkill rfkill;

drivers/net/wireless/b43legacy/main.c

@@ -2297,6 +2297,7 @@ static void b43legacy_security_init(struct b43legacy_wldev *dev)
 				  dev->max_nr_keys - 8);
 }
 
+#ifdef CONFIG_B43LEGACY_HWRNG
 static int b43legacy_rng_read(struct hwrng *rng, u32 *data)
 {
 	struct b43legacy_wl *wl = (struct b43legacy_wl *)rng->priv;
@@ -2312,17 +2313,21 @@ static int b43legacy_rng_read(struct hwrng *rng, u32 *data)
 
 	return (sizeof(u16));
 }
+#endif
 
 static void b43legacy_rng_exit(struct b43legacy_wl *wl)
 {
+#ifdef CONFIG_B43LEGACY_HWRNG
 	if (wl->rng_initialized)
 		hwrng_unregister(&wl->rng);
+#endif
 }
 
 static int b43legacy_rng_init(struct b43legacy_wl *wl)
 {
-	int err;
+	int err = 0;
 
+#ifdef CONFIG_B43LEGACY_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;
@@ -2336,6 +2341,7 @@ static int b43legacy_rng_init(struct b43legacy_wl *wl)
 		       "number generator (%d)\n", err);
 	}
 
+#endif
 	return err;
 }