Emmanuel Grumbach 43e5885658 iwlwifi: avoid a panic when unloading the module with RF Kill ... When HW RF kill switch is set to kill the radio, our NIC issues an interrupt after we stop the APM module. When we unload the module, the driver disables and cleans the interrupts before stopping the APM. So we have a real interrupt (inta not zero) pending. When this interrupts pops up the tasklet has already been killed and we crash. Here is a logical description of the flow: disable and clean interrupts synchronize interrupts kill the tasklet stop the APM <<== creates an RF kill interrupt free_irq <<== somehow our ISR is called here and we crash Here is the panic message: [ 201.313636] BUG: unable to handle kernel paging request at ffff8800911b7150 [ 201.314541] IP: [<ffffffff8106d652>] tasklet_action+0x62/0x130 [ 201.315149] PGD 1c06063 PUD db37f067 PMD db408067 PTE 80000000911b7160 [ 201.316456] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC [ 201.317324] CPU 1 [ 201.317495] Modules linked in: arc4 iwlwifi(-) mac80211 cfg80211 netconsole configfs binfmt_misc i915 drm_kms_helper drm uvcvideo i2c_algo_bit videodev dell_laptop dcdbas intel_agp dell_wmi intel_ips psmouse intel_gtt v4l2_compat_ioctl32 asix usbnet mii serio_raw video sparse_keymap firewire_ohci sdhci_pci sdhci firewire_core e1000e crc_itu_t [last unloaded: configfs] [ 201.323839] [ 201.324015] Pid: 2061, comm: modprobe Not tainted 3.1.0-rc9-wl #4 Dell Inc. Latitude E6410/0667CC [ 201.324736] RIP: 0010:[<ffffffff8106d652>] [<ffffffff8106d652>] tasklet_action+0x62/0x130 [ 201.325128] RSP: 0018:ffff88011bc43ea0 EFLAGS: 00010286 [ 201.325338] RAX: ffff88008ae70000 RBX: ffff8800911b7150 RCX: ffff88008ae70028 [ 201.325555] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88008ae70000 [ 201.325775] RBP: ffff88011bc43ec0 R08: 0000000000000000 R09: 0000000000000000 [ 201.325994] R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000001 [ 201.326212] R13: 0000000000000006 R14: 0000000000000100 R15: ffff88008e259fd8 [ 201.326431] FS: 00007f4b90ea9700(0000) GS:ffff88011bc40000(0000) knlGS:0000000000000000 [ 201.326657] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 201.326864] CR2: ffff8800911b7150 CR3: 000000008fd6d000 CR4: 00000000000006e0 [ 201.327083] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 201.327302] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 201.327521] Process modprobe (pid: 2061, threadinfo ffff88008e258000, task ffff88008ae70000) [ 201.327747] Stack: [ 201.330494] 0000000000000046 0000000000000030 0000000000000001 0000000000000006 [ 201.333870] ffff88011bc43f30 ffffffff8106cd8a ffffffff811e1016 ffff88011bc43f08 [ 201.337186] 0000000100000046 ffff88008e259fd8 0000000a10be2160 0000000000000006 [ 201.340458] Call Trace: [ 201.342994] <IRQ> [ 201.345656] [<ffffffff8106cd8a>] __do_softirq+0xca/0x250 [ 201.348185] [<ffffffff811e1016>] ? pde_put+0x76/0x90 [ 201.350730] [<ffffffff8131aeae>] ? do_raw_spin_unlock+0x5e/0xb0 [ 201.353261] [<ffffffff811e1016>] ? pde_put+0x76/0x90 [ 201.355776] [<ffffffff8163ccfc>] call_softirq+0x1c/0x30 [ 201.358287] [<ffffffff8101531d>] do_softirq+0x9d/0xd0 [ 201.360823] [<ffffffff8106cb05>] irq_exit+0xd5/0xf0 [ 201.363330] [<ffffffff8163d5d6>] do_IRQ+0x66/0xe0 [ 201.365819] [<ffffffff81632673>] common_interrupt+0x73/0x73 [ 201.368257] <EOI> Cc: <stable@kernel.org> 3.1+ Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>		2011-11-11 11:03:24 -05:00
..
appletalk	net: remove use of ndo_set_multicast_list in drivers	2011-08-17 20:22:03 -07:00
arcnet	drivers/net: Kconfig & Makefile cleanup	2011-08-27 00:58:49 -07:00
bonding	bonding: eliminate bond_close race conditions	2011-10-30 03:13:14 -04:00
caif	caif-hsi: Added recovery check of CA wake status.	2011-10-19 03:25:43 -04:00
can	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2011-10-25 13:25:22 +02:00
cris	net: remove use of ndo_set_multicast_list in drivers	2011-08-17 20:22:03 -07:00
ethernet	qlcnic: fix beacon and LED test.	2011-10-30 03:09:41 -04:00
fddi	skfp: Fix SysKonnect FDDI driver compile issues	2011-08-27 00:58:23 -07:00
hamradio
hippi	hippi: Move the HIPPI driver	2011-08-27 00:58:30 -07:00
irda	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2011-10-25 13:25:22 +02:00
phy	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2011-10-25 13:25:22 +02:00
plip	plip: Move the PLIP driver	2011-08-27 00:58:33 -07:00
ppp	Merge branch 'master' of ra.kernel.org:/pub/scm/linux/kernel/git/davem/net	2011-10-24 18:18:09 -04:00
slip	slip: Move the SLIP drivers	2011-08-27 00:58:36 -07:00
tokenring	drivers/net: Kconfig & Makefile cleanup	2011-08-27 00:58:49 -07:00
usb	Merge branch 'pm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm	2011-10-25 15:18:39 +02:00
vmxnet3	net: add skb frag size accessors	2011-10-19 03:10:46 -04:00
wan	wan: make LAPB callbacks const	2011-09-16 19:20:20 -04:00
wimax	PM / Runtime: Add macro to test for runtime PM events	2011-08-19 23:49:48 +02:00
wireless	iwlwifi: avoid a panic when unloading the module with RF Kill	2011-11-11 11:03:24 -05:00
xen-netback	net: add skb frag size accessors	2011-10-19 03:10:46 -04:00
dummy.c	net: remove use of ndo_set_multicast_list in drivers	2011-08-17 20:22:03 -07:00
eql.c
ifb.c
Kconfig	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2011-10-25 12:11:02 +02:00
LICENSE.SRC
loopback.c
macvlan.c	macvlan: handle fragmented multicast frames	2011-10-18 23:22:07 -04:00
macvtap.c	macvtap: Fix the minor device number allocation	2011-10-21 02:53:07 -04:00
Makefile	net: Fix duplicate CONFIG_SLIP entry in driver/net/Makefile	2011-08-29 22:55:53 -04:00
mdio.c
mii.c
netconsole.c	netconsole: enable netconsole can make net_device refcnt incorrent	2011-10-18 23:55:29 -04:00
rionet.c	rapidio: fix use of non-compatible registers	2011-08-25 16:25:34 -07:00
sb1000.c
Space.c
sungem_phy.c	net: Fix sungem_phy sharing.	2011-08-16 00:16:49 -07:00
tun.c	net: remove use of ndo_set_multicast_list in drivers	2011-08-17 20:22:03 -07:00
veth.c
virtio_net.c	Add ethtool -g support to virtio_net	2011-10-24 02:07:21 -04:00
xen-netfront.c	net: add skb frag size accessors	2011-10-19 03:10:46 -04:00