1.问题现象：

打开wifi的图标，wifi加载后又自动卸载。

2.问题分析

驱动能正常加载，但是又自动卸载，说明驱动没有完全满足安卓的要求，查看wifi加载的源码“hardware/libhardware_legacy/wifi/wifi.”可知wifi要正确加载必须满足“wlan0和p2p”两个条件

int wifi_load_driver()

{

char driver_status[PROPERTY_VALUE_MAX];

int  count = 0;

char tmp_buf[512] = {0};

char *p_strstr_wlan  = NULL;

char *p_strstr_p2p   = NULL;

int  ret        = 0;

FILE *fp        = NULL;

ALOGD("Start to insmod %s.ko\n", WIFI_DRIVER_MODULE_NAME);

if (insmod(DRIVER_MODULE_PATH, DRIVER_MODULE_ARG) < 0) {

ALOGE("insmod %s ko failed!", WIFI_DRIVER_MODULE_NAME);

rmmod(DRIVER_MODULE_NAME); //it may be load driver already,try remove it.

return -1;

}

do{

fp=fopen("/proc/net/wireless", "r");

if (!fp) {

ALOGE("failed to fopen file: /proc/net/wireless\n");

property_set(DRIVER_PROP_NAME, "failed");

rmmod(DRIVER_MODULE_NAME); //try remove it.

return -1;

}

ret = fread(tmp_buf, sizeof(tmp_buf), 1, fp);

if (ret==0){

ALOGD("faied to read proc/net/wireless");

}

fclose(fp);

ALOGD("loading wifi driver...");

p_strstr_wlan = strstr(tmp_buf, "wlan0");

p_strstr_p2p  = strstr(tmp_buf, "p2p0");

if (p_strstr_wlan != NULL && p_strstr_p2p != NULL) {

property_set(DRIVER_PROP_NAME, "ok");

break;

}

usleep(200000);// 200ms

} while (count++ <= TIME_COUNT);

if(count > TIME_COUNT) {

ALOGE("timeout, register netdevice wlan0 failed.");

property_set(DRIVER_PROP_NAME, "timeout");

rmmod(DRIVER_MODULE_NAME);

return -1;

}

return 0;

}

利用命令查询wifi驱动加载后的状态

255|shell@tulip-t1:/vendor/modules # cat /proc/net/wireless

Inter-| sta-| Quality | Discarded packets | Missed | WE

face | tus | link level noise | nwid crypt frag retry misc | beacon | 22

wlan0: 0000 0 0 0 0 0 0 0 0 0

发现只有一个wlan0的接口，没有p2p的接口，出现这个问题是由于wifi驱动的配置参数出问题了，增加p2p支持后就能解决问题，再次查看wifi状态就正常了。

shell@tulip-t1:/ $ cat /proc/net/wireless

Inter-| sta-| Quality | Discarded packets | Missed | WE

face | tus | link level noise | nwid crypt frag retry misc | beacon | 22

wlan0: 0000 50. -60. -256 0 0 0 0 0 0

p2p0: 0000 0 0 0 0 0 0 0 0 0