This bug seems to be due to commit 27ae60f8f7aac ("ipw2x00: replace
"ieee80211" with "libipw" where appropriate"), where Pavel did this:

-       libipw_proc = proc_mkdir(DRV_NAME, init_net.proc_net);
+       libipw_proc = proc_mkdir("ieee80211", init_net.proc_net);

but then the cleanup was kept as

        remove_proc_entry(DRV_NAME, init_net.proc_net);

in both places (both in the failure case and in the unload case). The
error string is also total crap, and says

     "Unable to create " DRV_NAME " proc directory\n");

Even though it doesn't actually create a proc directory named DRV_NAME at all.

So that patch looks like total and utter crap to me. The commit message says

  "Keep /proc/net/ieee80211 under the original name to avoid breaking user
    interface."

but the thing is, it really didn't fix anything but that one create
thing. It needs to fix all the other cases too.

Totally UNTESTED patch attached. It may or may not compile. And maybe
it doesn't catch all cases, but it should catch the obvious ones.

                           Linus

On Wed, Nov 3, 2010 at 4:18 PM, Randy Dunlap <randy.dunlap@oracle.com> wrote:
quoted text
>
> Nov  3 16:03:11 control kernel: [   74.701367]     (5170000[   74.846676] calling  libipw_init+0x0/0xe4 [libipw] @ 2992
> [   74.852356] libipw: 802.11 data/management/control stack, git-1.1.13
> [   74.858790] libipw: Copyright (C) 2004-2005 Intel Corporation <jketreno@linux.intel.com>
> [   74.866977] initcall libipw_init+0x0/0xe4 [libipw] returned 0 after 14318 usecs
> Nov  3 16:03:11 control kernel: [   74.846676] calling  libipw_iNov  3 16:03:11 control kernel: [   74.852356] libipw: 802.11 data/management/control stack, git-1.1.13
> Nov  3 16:03:11 control kernel: [   74.858790] libipw: C
>
>
> [   78.273409] ------------[ cut here ]------------
> [   78.278210] WARNING: at /local/linsrc/lnx-2637-rc1/fs/proc/generic.c:816 remove_proc_entry+0x156/0x35e()
> Nov  3 16:03:14 [   78.288314] Hardware name: OptiPlex GX620
> control kernel: [   78.294870] name 'libipw'
> [   78.298520] Modules linked in: libipw(-) lib80211 cfg80211 ipt_MASQUERADE iptable_nat nf_nat af_packet nfsd lockd nfs_acl auth_rpcgss exportfs sco bridge stp llc bnep l2cap crc16 bluetoothNov  3 16:03:14  rfkillcontrol kernel:  sunrpc[   78.278210] W ipt_REJECTARNING: at /loca nf_conntrack_ipv4l/linsrc/lnx-263 nf_defrag_ipv47-rc1/fs/proc/ge iptable_filterneric.c:816 remo ip_tablesve_proc_entry+0x ip6t_REJECT156/0x35e()
> Nov  xt_tcpudp 3 16:03:14 cont nf_conntrack_ipv6rol kernel: [    nf_defrag_ipv678.288314] Hardw xt_stateare name: OptiPl nf_conntrackex GX620         ip6table_filter
> Nov  3 1 ip6_tables6:03:14 control  x_tableskernel: [   78.2 ipv694870] name 'lib p4_clockmodipw'
>  freq_table speedstep_lib binfmt_misc dm_mirror dm_region_hash dm_log dm_multipath scsi_dh dm_mod kvm uinput mousedev joydev snd_intel8x0 snd_ac97_codec ac97_bus ppdev snd_seq snd_seq_device usbmouse snd_pcm led_class usbkbd snd_timer usbhid iTCO_wdt hid snd iTCO_vendor_support tg3 sr_mod dcdbas cdrom soundcore i2c_i801 rtc_cmos sg pcspkr rng_core parport_pc snd_page_alloc rtc_core shpchp evdev rtc_lib parport 8250_pnp pci_hotplug mac_hid unix ide_pci_generic ide_core ata_generic pata_acpi ata_piix sd_mod crc_t10dif ext3 jbd mbcache uhci_hcd ohci_hcd ssb mmc_core pcmcia pcmcia_core firmware_class ehci_hcd usbcore nls_base i915 drm_kms_helper intel_agp button intel_gtt video thermal_sys hwmon output [last unloaded: mperf]
> [   78.429364] Pid: 3067, comm: rmmod Not tainted 2.6.37-rc1 #10
> [   78.435209] Call Trace:
> [   78.437982]  [<ffffffff8107e1ed>] warn_slowpath_common+0xc6/0xf3
> [   78.444119]  [<ffffffff8107e30a>] warn_slowpath_fmt+0x5b/0x6b
> [   78.449973]  [<ffffffff81550dbb>] ? _raw_spin_unlock+0x40/0x4b
> [   78.456247]  [<ffffffff8123d37e>] remove_proc_entry+0x156/0x35e
> Nov  3 16:03:14 [   78.462289]  [<ffffffff81017d29>] ? native_sched_clock+0x3b/0x6d
> control kernel: [   78.470047]  [<ffffffff810b067f>] ? sched_clock_cpu+0x147/0x160
> [   78.298520] M[   78.477041]  [<ffffffff81137479>] ? trace_hardirqs_off+0x10/0x4a
> odules linked in: libipw(-) lib80211 cfg80211 ip[   78.487138]  [<ffffffff810b0742>] ? local_clock+0xaa/0xf4
> t_MASQUERADE iptable_nat nf_nat [   78.496297]  [<ffffffff810c0ab9>] ? lock_release_holdtime+0x41/0x177
> Nov  3 16:03:14 [   78.505725]  [<ffffffff810c3a1b>] ? lock_release_nested+0xfb/0x133
> Nov  3 16:03:14 [   78.514477]  [<ffffffffa0c39cad>] libipw_exit+0x49/0x5d [libipw]
> Nov  3 16:03:14 [   78.523311]  [<ffffffff810d3310>] sys_delete_module+0x2d6/0x368
> [   78.531755]  [<ffffffff8154f9cb>] ? lockdep_sys_exit_thunk+0x35/0x67
> Nov  3 16:03:14 Nov  3 16:03:14 [   78.540954]  [<ffffffff810fd60f>] ? audit_syscall_entry+0x172/0x1a5
> Nov  3 16:03:14 [   78.550029]  [<ffffffff8154f955>] ? trace_hardirqs_on_thunk+0x3a/0x3f
> Nov  3 16:03:14 [   78.559196]  [<ffffffff8100ea72>] system_call_fastpath+0x16/0x1b
> Nov  3 16:03:14 [   78.567700] ---[ end trace b9ae9f3ab8d89ea5 ]---
>
>
> ---
> ~Randy
> *** Remember to use Documentation/SubmitChecklist when testing your code ***
>