[Bugme-new] [Bug 16554] New: wl1251 stalls connection completely when being asked to scan while associated

bugzilla-daemon at bugzilla.kernel.org bugzilla-daemon at bugzilla.kernel.org
Tue Aug 10 06:33:47 PDT 2010


https://bugzilla.kernel.org/show_bug.cgi?id=16554

           Summary: wl1251 stalls connection completely when being asked
                    to scan while associated
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.35
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: network-wireless
        AssignedTo: drivers_network-wireless at kernel-bugs.osdl.org
        ReportedBy: ameya.palande at nokia.com
        Regression: No


BUG DETAILED DESCRIPTIONS
===========================================================

When WL1251 is asked to scan while associated, wifi connection breaks down, no
pings go through, also after scan results are done.

While it's natural for active scans to slow down/stop traffic, it is not
supposed to be a permanent effect.

EXACT STEPS LEADING TO PROBLEM:
(Explain in detail what you do (e.g. tap on OK) and what you see (e.g. message
Connection Failed appears))
===========================================================
1. Disable connman, UX startup in inittab. Enable USB networking.
2. SSH in, Set up wpa supplicant config file /etc/wpasupp.conf (values cut out
to protect my local network):

ap_scan=1

network={
    ssid="MYSSID"
    proto=RSN
        key_mgmt=WPA-PSK
        pairwise=CCMP TKIP
        group=CCMP TKIP
    #psk="MYPSK"
    psk=MYHEXPSK
}

3. wpa_supplicant -B -c /etc/wpasupp.conf -iwlan0 -Dnl80211
4. (after few seconds), dhclient wlan0
5. start ping of default gateway, watch ping away [session 1]
6. ssh in with other session, run wpa_cli, write 'scan' and 'scan_results'
afterwards
7. ping in [session 1] now stops working and continues to stop working.
Eventually shows ping: sendmsg: No buffer space available. dmesg states we are
still associated. 

EXPECTED OUTCOME:
===================

Pings continuing after scan results

ACTUAL OUTCOME:
===================

Pings does not continue

USER IMPACT:
===================

User experiences wifi on N900 that does not work when associated.

REPRODUCIBILITY:
(always, less than 1/10, 5/10, 9/10)
=====================================

always

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