[C] error : static declaration follows non-static declaration (1)

error message

error: static declaration of 'call80211ioctl' follows non-static declaration
call80211ioctl ( struct atheros_driver_data *drv, int op, struct iwreq *iwr )
 ^

error code

static int get80211param ( struct atheros_driver_data *drv, char *ifname, int op, int *data )
{
     if ( call80211ioctl ( drv, IEEE80211_IOCTL_GETPARAM, &iwr) < 0 )
          return -1;
}

static int call80211ioctl ( struct atheros_driver_data *drv, int op, struct iwreq *iwr )
{
     ...
}

explain

因爲在檔案的最前面沒有先宣告 call80211ioctl(),
且 call80211ioctl() 寫在 get80211param() 後面,
所以在 get80211param 要呼叫 call80211ioctl() 時, 並不知道有 call80211ioctl()