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staging: rtl8188eu: Fix incorrect response to SIOCGIWESSID

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When not associated with an AP, wifi device drivers should respond to the
SIOCGIWESSID ioctl with a zero-length string for the SSID, which is the
behavior expected by dhcpcd.

Currently, this driver returns an error code (-1) from the ioctl call,
which causes dhcpcd to assume that the device is not a wireless interface
and therefore it fails to work correctly with it thereafter.

This problem was reported and tested at
https://github.com/lwfinger/rtl8188eu/issues/234.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Larry Finger 2017-11-25 13:32:38 -06:00 committed by Greg Kroah-Hartman
parent c5f39d0786
commit b77992d2df
1 changed files with 4 additions and 10 deletions
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14
drivers/staging/rtl8188eu/os_dep/ioctl_linux.c
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@ -1395,19 +1395,13 @@ static int rtw_wx_get_essid(struct net_device *dev,
if ((check_fwstate(pmlmepriv, _FW_LINKED)) ||
(check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE))) {
len = pcur_bss->Ssid.SsidLength;
wrqu->essid.length = len;
memcpy(extra, pcur_bss->Ssid.Ssid, len);
wrqu->essid.flags = 1;
} else {
ret = -1;
goto exit;
len = 0;
*extra = 0;
}
exit:
wrqu->essid.length = len;
wrqu->essid.flags = 1;
return ret;
}