打开wifi后系统报以下Oops：
<4>[ 28.323500:0] RTL871X: module init start
<4>[ 28.323523:0] RTL871X: rtl8723bs v4.3.9_12575.20141104_BTCOEX20140929-5443
<4>[ 28.323535:0] RTL871X: build time: Dec 30 2014 15:46:41
<4>[ 28.323547:0] RTL871X: rtl8723bs BT-Coex version = BTCOEX20140929-5443
<6>[ 28.323586:0] bcm_wlan_power_on: WiFi WL_REG_ON GPIO 7, flag 1 >>>>>>>>>
<4>[ 28.323711:0] RICOH61x_LDO7: Failed to create debugfs directory
<1>[ 28.441085:0] Unable to handle kernel NULL pointer dereference at virtual address 00000028
<1>[ 28.441103:0] pgd = dbd38000
<1>[ 28.441111:0] [00000028] *pgd=00000000
<0>[ 28.441131:0] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
<4>[ 28.441141:0] Modules linked in: wlan(+) galcore hx280enc hx170dec mali ump memalloc
<4>[ 28.441174:0] CPU: 0 Tainted: G W (3.4.0 #350)
<4>[ 28.441479:0] PC is at rtw_ndev_notifier_call+0x20/0x74 [wlan]
<4>[ 28.441505:0] LR is at register_netdevice_notifier+0x58/0x18c
<4>[ 28.441517:0] pc : [<bf155664>] lr : [<c03930cc>] psr: 20000113
<4>[ 28.441523:0] sp : dbd3fe48 ip : dbd3fe60 fp : dbd3fe5c
<4>[ 28.441533:0] r10: 00000000 r9 : 00000023 r8 : 00000000
<4>[ 28.441542:0] r7 : c0929c48 r6 : ed97a800 r5 : 00000005 r4 : ed97a800
<4>[ 28.441553:0] r3 : bf164cbc r2 : 00000000 r1 : 00000005 r0 : bf203d50
<4>[ 28.441565:0] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
<4>[ 28.441576:0] Control: 10c53c7d Table: 9dd3804a DAC: 00000015
<4>[ 28.441586:0]
<4>[ 28.441589:0] LR: 0xc039304c:
<4>[ 28.441595:0] 304c e59f301c e2466010 e1560003 1affffdb eb0032af e1a00008 e89da9f8 c092a2dc
<4>[ 28.441621:0] 306c c06fddc4 c06fddb4 e1a0c00d e92dddf0 e24cb004 e1a04000 eb0032b1 e59f0160
<4>[ 28.441647:0] 308c e1a01004 ebf2cedf e2508000 1a000023 e59f3150 e5933008 e3530000 059f3148
<4>[ 28.441672:0] 30ac 05935000 0a000019 ea00001c e1a07005 e5b76068 ea00000d e1a0e00f e594f000
<4>[ 28.441697:0] 30cc e3c0a902 e35a0001 ca000017 e5963124 e3130001 0a000004 e1a02006 e1a00004
<4>[ 28.441722:0] 30ec e3a01001 e1a0e00f e594f000 e5966074 e2466074 e3a01005 e2863074 e1a00004
<4>[ 28.441747:0] 310c e1530007 e1a02006 1affffea e5955010 e59f30d8 e2455010 e1550003 1affffe2
<4>[ 28.441772:0] 312c eb00327b e1a00008 e89dadf0 e59f30b8 e5937000 ea000021 e1a08007 e5b85068
<4>[ 28.441798:0]
<4>[ 28.441801:0] SP: 0xdbd3fdc8:
<4>[ 28.441807:0] fdc8 dbd3fdfc dbd3fdd8 c0010848 c0011b5c dbd3fdfc dbd3fde8 bf155664 20000113
<4>[ 28.441832:0] fde8 ffffffff dbd3fe34 dbd3fe5c dbd3fe00 c000dbd8 c0008398 bf203d50 00000005
<4>[ 28.441857:0] fe08 00000000 bf164cbc ed97a800 00000005 ed97a800 c0929c48 00000000 00000023
<4>[ 28.441882:0] fe28 00000000 dbd3fe5c dbd3fe60 dbd3fe48 c03930cc bf155664 20000113 ffffffff
<4>[ 28.441906:0] fe48 bf203d50 c0929be0 dbd3fe84 dbd3fe60 c03930cc bf155650 bf203d68 bf266000
<4>[ 28.441931:0] fe68 00000001 dbf34ea0 00000001 00000000 dbd3fe94 dbd3fe88 bf1556cc c0393080
<4>[ 28.441956:0] fe88 dbd3feac dbd3fe98 bf266088 bf1556c4 dbd3e000 bf224d40 dbd3fefc dbd3feb0
<4>[ 28.441981:0] fea8 c000856c bf26600c dbd3fedc dbd3fec0 c00a78a4 c00aeeec bf224d40 bf224d40
<4>[ 28.442007:0]
<4>[ 28.442010:0] IP: 0xdbd3fde0:
<4>[ 28.442016:0] fde0 bf155664 20000113 ffffffff dbd3fe34 dbd3fe5c dbd3fe00 c000dbd8 c0008398
<4>[ 28.442041:0] fe00 bf203d50 00000005 00000000 bf164cbc ed97a800 00000005 ed97a800 c0929c48
<4>[ 28.442065:0] fe20 00000000 00000023 00000000 dbd3fe5c dbd3fe60 dbd3fe48 c03930cc bf155664
<4>[ 28.442090:0] fe40 20000113 ffffffff bf203d50 c0929be0 dbd3fe84 dbd3fe60 c03930cc bf155650
<4>[ 28.442115:0] fe60 bf203d68 bf266000 00000001 dbf34ea0 00000001 00000000 dbd3fe94 dbd3fe88
<4>[ 28.442140:0] fe80 bf1556cc c0393080 dbd3feac dbd3fe98 bf266088 bf1556c4 dbd3e000 bf224d40
<4>[ 28.442164:0] fea0 dbd3fefc dbd3feb0 c000856c bf26600c dbd3fedc dbd3fec0 c00a78a4 c00aeeec
<4>[ 28.442189:0] fec0 bf224d40 bf224d40 bf224d88 00000001 dbf34ea0 bf224d40 bf224d88 00000001
<4>[ 28.442215:0]
<4>[ 28.442218:0] FP: 0xdbd3fddc:
<4>[ 28.442223:0] fddc dbd3fde8 bf155664 20000113 ffffffff dbd3fe34 dbd3fe5c dbd3fe00 c000dbd8
<4>[ 28.442248:0] fdfc c0008398 bf203d50 00000005 00000000 bf164cbc ed97a800 00000005 ed97a800
<4>[ 28.442273:0] fe1c c0929c48 00000000 00000023 00000000 dbd3fe5c dbd3fe60 dbd3fe48 c03930cc
<4>[ 28.442298:0] fe3c bf155664 20000113 ffffffff bf203d50 c0929be0 dbd3fe84 dbd3fe60 c03930cc
<4>[ 28.442338:0] fe5c bf15565
其实是缺少如下配置：
CONFIG_FIB_RULES=y
CONFIG_WIRELESS=y
CONFIG_WIRELESS_EXT=y
CONFIG_WEXT_CORE=y
CONFIG_WEXT_PROC=y
CONFIG_WEXT_PRIV=y
CONFIG_CFG80211=y
# CONFIG_NL80211_TESTMODE is not set
# CONFIG_CFG80211_DEVELOPER_WARNINGS is not set
# CONFIG_CFG80211_REG_DEBUG is not set
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