Idea copied from Arch broadcom-wl package:
http://aur.archlinux.org/packages.php?ID=19514

diff -Naur broadcom-sta-5.100.82.112.orig/src/wl/sys/wl_linux.c broadcom-sta-5.100.82.112/src/wl/sys/wl_linux.c
--- broadcom-sta-5.100.82.112.orig/src/wl/sys/wl_linux.c	2011-10-23 01:56:55.000000000 +0900
+++ broadcom-sta-5.100.82.112/src/wl/sys/wl_linux.c	2011-11-22 00:56:07.021520421 +0900
@@ -385,7 +385,11 @@
 #endif
 	.ndo_get_stats = wl_get_stats,
 	.ndo_set_mac_address = wl_set_mac_address,
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0)
 	.ndo_set_multicast_list = wl_set_multicast_list,
+#else
+	.ndo_set_rx_mode = wl_set_multicast_list,
+#endif
 	.ndo_do_ioctl = wl_ioctl
 };