ath9k: Fix crash on module unload
Make sure that any open relayfs files are closed before
unregistering with mac80211, otherwise this crash is seen:
[ 1331.097846] BUG: unable to handle kernel paging request at
6b6b6b8b
[ 1331.098170] IP: [<
c063d0d6>] debugfs_remove+0x26/0x80
[ 1331.098170] *pdpt =
000000002f9aa001 *pde =
0000000000000000
[ 1331.098170] Oops: 0000 [#1] PREEMPT SMP
[ 1331.098170] Modules linked in: iptable_raw xt_CT nf_conntrack_ipv4 nf_defrag]
[ 1331.098170] Pid: 4794, comm: rmmod Tainted: G WC 3.9.1+ #5 To Be Fi.
[ 1331.098170] EIP: 0060:[<
c063d0d6>] EFLAGS:
00010202 CPU: 0
[ 1331.098170] EIP is at debugfs_remove+0x26/0x80
[ 1331.098170] EAX:
f2f3acd0 EBX:
f2f3acd0 ECX:
00000006 EDX:
f8622348
[ 1331.098170] ESI:
6b6b6b6b EDI:
00000001 EBP:
ee251e14 ESP:
ee251e0c
[ 1331.098170] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[ 1331.098170] CR0:
8005003b CR2:
6b6b6b8b CR3:
2e7b7000 CR4:
000007e0
[ 1331.098170] DR0:
00000000 DR1:
00000000 DR2:
00000000 DR3:
00000000
[ 1331.098170] DR6:
ffff0ff0 DR7:
00000400
[ 1331.098170] Process rmmod (pid: 4794, ti=
ee250000 task=
efaa2560 task.ti=ee25)
[ 1331.098170] Stack:
[ 1331.098170]
f241e170 0000000a ee251e1c f861394d ee251e28 c04e3088 f241e170 4
[ 1331.098170]
c04e30fe f45482b0 ee251e54 c04e3187 f25e86b0 ee251e54 f8618748 0
[ 1331.098170]
0000000a 00000001 ee251e68 f860065b f2509e20 f25085a0 f5b6e8a4 8
[ 1331.098170] Call Trace:
[ 1331.098170] [<
f861394d>] remove_buf_file_handler+0xd/0x20 [ath9k]
[ 1331.098170] [<
c04e3088>] relay_remove_buf+0x18/0x30
[ 1331.098170] [<
c04e30fe>] relay_close_buf+0x2e/0x40
[ 1331.098170] [<
c04e3187>] relay_close+0x77/0xf0
[ 1331.098170] [<
f8618748>] ? dpd_exit+0x38/0x40 [ath9k]
[ 1331.098170] [<
f860065b>] ath9k_deinit_softc+0x8b/0xa0 [ath9k]
[ 1331.098170] [<
f86006b8>] ath9k_deinit_device+0x48/0x60 [ath9k]
[ 1331.098170] [<
f86107f1>] ath_pci_remove+0x31/0x50 [ath9k]
[ 1331.098170] [<
c06dbff8>] pci_device_remove+0x38/0xc0
[ 1331.098170] [<
c079daa4>] __device_release_driver+0x64/0xc0
[ 1331.098170] [<
c079db97>] driver_detach+0x97/0xa0
[ 1331.098170] [<
c079cacc>] bus_remove_driver+0x6c/0xe0
[ 1331.098170] [<
c079c197>] ? bus_put+0x17/0x20
[ 1331.098170] [<
c079cae3>] ? bus_remove_driver+0x83/0xe0
[ 1331.098170] [<
c079e709>] driver_unregister+0x49/0x80
[ 1331.098170] [<
c06dc138>] pci_unregister_driver+0x18/0x80
[ 1331.098170] [<
f8610602>] ath_pci_exit+0x12/0x20 [ath9k]
[ 1331.098170] [<
f8619ce0>] ath9k_exit+0x17/0x337 [ath9k]
[ 1331.098170] [<
c09e537d>] ? mutex_unlock+0xd/0x10
[ 1331.098170] [<
c04bd36c>] sys_delete_module+0x17c/0x250
[ 1331.098170] [<
c0540dc4>] ? do_munmap+0x244/0x2d0
[ 1331.098170] [<
c0540e96>] ? vm_munmap+0x46/0x60
[ 1331.098170] [<
c09e8dc4>] ? restore_all+0xf/0xf
[ 1331.098170] [<
c09ebf50>] ? __do_page_fault+0x4c0/0x4c0
[ 1331.098170] [<
c04b18e4>] ? trace_hardirqs_on_caller+0xf4/0x180
[ 1331.098170] [<
c09ef28d>] sysenter_do_call+0x12/0x38
[ 1331.098170] Code: 90 8d 74 26 00 55 89 e5 83 ec 08 89 1c 24 89 74 24 04 3e 82
[ 1331.098170] EIP: [<
c063d0d6>] debugfs_remove+0x26/0x80 SS:ESP 0068:
ee251e0c
[ 1331.098170] CR2:
000000006b6b6b8b
[ 1331.727971] ---[ end trace
b5bb9f2066cef7f9 ]---
Cc: <stable@vger.kernel.org>
Acked-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Tested-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>