b43: 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: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 17 insertions, 3 deletions

diff --git a/drivers/net/wireless/b43/Kconfig b/drivers/net/wireless/b43/Kconfig
index aab71a70ba7..21572e40b79 100644
--- a/drivers/net/wireless/b43/Kconfig
+++ b/drivers/net/wireless/b43/Kconfig
@@ -3,7 +3,6 @@ config B43
         depends on SSB_POSSIBLE && MAC80211 && WLAN_80211 && HAS_DMA
         select SSB
         select FW_LOADER
-        select HW_RANDOM
         ---help---
           b43 is a driver for the Broadcom 43xx series wireless devices.
 
@@ -106,6 +105,13 @@ config B43_RFKILL
         depends on B43 && (RFKILL = y || RFKILL = B43) && RFKILL_INPUT && (INPUT_POLLDEV = y || INPUT_POLLDEV = B43)
         default y
 
+# This config option automatically enables b43 HW-RNG support,
+# if the HW-RNG core is enabled.
+config B43_HWRNG
+        bool
+        depends on B43 && (HW_RANDOM = y || HW_RANDOM = B43)
+        default y
+
 config B43_DEBUG
         bool "Broadcom 43xx debugging"
         depends on B43
diff --git a/drivers/net/wireless/b43/b43.h b/drivers/net/wireless/b43/b43.h
index beaf18d6e8a..cc1db7e5c66 100644
--- a/drivers/net/wireless/b43/b43.h
+++ b/drivers/net/wireless/b43/b43.h
@@ -625,9 +625,11 @@ 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;
diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index 79b685e300c..09e0c60d96d 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -2980,6 +2980,7 @@ static void b43_security_init(struct b43_wldev *dev)
         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;
@@ -2995,17 +2996,21 @@ static int b43_rng_read(struct hwrng *rng, u32 *data)
 
         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;
@@ -3018,6 +3023,7 @@ static int b43_rng_init(struct b43_wl *wl)
                 b43err(wl, "Failed to register the random "
                        "number generator (%d)\n", err);
         }
+#endif /* CONFIG_B43_HWRNG */
 
         return err;
 }