heshanxingzhe 发表于 2011-06-13 22:51

wifi移植后,连接几分钟后自动断开,郁闷中。。。

最近移植了一个sdio的wifi驱动,能够正常启动。
iwconfig wlan2 essid "China-2205"和/sbin/udhcpc -i wlan2可以正确的连接,然后ping 192.168.0.1也可以ping通(wificfg是自己写的一个wifi登陆脚本)root@J2534:/# modprobe libertas_sdio
[   22.315000] libertas_sdio: Libertas SDIO driver
[   22.315000] libertas_sdio: Copyright Pierre Ossman
[   23.610000] libertas: 00:0b:6c:b6:d6:e3, fw 9.70.3p24, cap 0x00000303
[   23.610000] libertas: unidentified region code; using the default (USA)
[   23.660000] cfg80211: Calling CRDA for country: US
[   23.685000] libertas: wlan2: Marvell WLAN 802.11 adapter
root@J2534:/# wificfg
[   37.790000] ADDRCONF(NETDEV_UP): wlan2: link is not ready

Searching wireless AP,please wait...
Scanning result:
      ESSID               key on/off
(1)    "ChinaNet-CFEb"            on
(2)    "chinaNet"                   off
(3)    "router-China 2205"         on

you can also enter r/q for:
                           Rescanning(r)
                           quit(q)

Pls enter the Router's number[(1)?]:3
Pls enter key:79376
The key is 79376 are you sure?
cfg80211: Calling CRDA for country: GB
udhcpc (v1.18.4) started
Setting IP address 0.0.0.0 on wlan2
Sending discover...
Sending select for 192.168.0.101...
Lease of 192.168.0.101 obtained, lease time 168000
Setting IP address 192.168.0.101 on wlan2
Deleting routers
route: SIOCDELRT: No such process
Adding router 192.168.0.1
Recreating /etc/resolv.conf
Adding DNS server 202.96.134.133
Adding DNS server 202.96.128.68

Connecting is successful!
root@J2534:/# ifconfig
wlan2   Link encap:EthernetHWaddr 00:0B:6C:B6:D6:E3
          inet addr:192.168.0.101Bcast:255.255.255.255Mask:255.255.255.0
          inet6 addr: fe80::20b:6cff:feb6:d6e3/64 Scope:Link
          UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
          RX packets:115 errors:0 dropped:0 overruns:0 frame:0
          TX packets:14 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:11378 (11.1 KiB)TX bytes:3104 (3.0 KiB)但过了一阵后(3 minutes~10 minutes),就自动断开了连接。
root@J2534:/# cfg80211: Calling CRDA to update world regulatory domain

root@J2534:/# dmesg|grep cfg80211
cfg80211: Calling CRDA for country: GB
cfg80211: All devices are disconnected, going to restore regulatory settings
cfg80211: Restoring regulatory settings
cfg80211: Calling CRDA to update world regulatory domain
看内核里的代码net/wireless/reg.c中,应该是到了这里:
static int call_crda(const char *alpha2)
{
        char country_env = "COUNTRY=";
        char *envp[] = {
                country_env,
                NULL
        };

        if (!is_world_regdom((char *) alpha2))
                printk(KERN_INFO "cfg80211: Calling CRDA for country: %c%c\n",
                        alpha2, alpha2);
        else
                printk(KERN_INFO "cfg80211: Calling CRDA to update world "
                        "regulatory domain\n");

        /* query internal regulatory database (if it exists) */
        reg_regdb_query(alpha2);

        country_env = alpha2;
        country_env = alpha2;

        return kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, envp);
}
但一直看不懂究竟是啥意思?


从man crda中得知,crda是由kernel触发和发出的udev事件给userspace。
下面是摘自man crda中的一段:
Description
       crda is the Linux wireless central regulatory domain agent.crda is intended to be used by udev scripts and
       should not be run manually unless debugging udev scripts.crda is triggered to run by the kernel by sending a
       udev event upon a new regulatory domain change. Regulatory domain changes are triggered by the wireless kernel
       subsystem (upon initialization and on reception of country IEs), wireless drivers, or userspace (see iw ). Upon a
       regulatory domain change the kernel sends a udev change event for the regulatory platform. The kernel ignores reg‐
       ulatory domains sent to it if it does not expect them. The regulatory domain is read by crda from the regula‐
       tory.bin file.
哪位大侠对mdev比较了解或遇见过类似情况的,麻烦指点下,感谢了!
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