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Message-ID: <20130603072556.GF15843@zurbaran>
Date: Mon, 3 Jun 2013 09:25:56 +0200
From: Samuel Ortiz <sameo@...ux.intel.com>
To: Tomas Winkler <tomas.winkler@...el.com>
Cc: gregkh@...uxfoundation.org, arnd@...db.de,
linux-kernel@...r.kernel.org
Subject: Re: [char-misc 3.10] mei: nfc: fix nfc device freeing
Hi Tomas,
On Mon, Jun 03, 2013 at 09:28:30AM +0300, Tomas Winkler wrote:
> The nfc_dev is a static variable and is not cleaned properly upon reset
> mainly ndev->cl and ndev->cl_info are not set to NULL after freeing which
>
> mei_stop:198: mei_me 0000:00:16.0: stopping the device.
> [ 404.253427] general protection fault: 0000 [#2] SMP
> [ 404.253437] Modules linked in: mei_me(-) binfmt_misc snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device edd af_packet cpufreq_conservative cpufreq_userspace cpufreq_powersave fuse loop dm_mod hid_generic usbhid hid coretemp acpi_cpufreq mperf kvm_intel kvm crc32c_intel ghash_clmulni_intel aesni_intel ablk_helper cryptd lrw gf128mul snd_hda_codec_hdmi glue_helper aes_x86_64 e1000e snd_hda_intel snd_hda_codec ehci_pci iTCO_wdt iTCO_vendor_support ehci_hcd snd_hwdep xhci_hcd snd_pcm usbcore ptp mei sg microcode snd_timer pps_core i2c_i801 snd pcspkr battery rtc_cmos lpc_ich mfd_core soundcore usb_common snd_page_alloc ac ext3 jbd mbcache drm_kms_helper drm intel_agp i2c_algo_bit intel_gtt i2c_core sd_mod crc_t10dif thermal fan video button processor thermal_sys hwmon ahci libahci libata scsi_mod [last unloaded: mei_me]
> [ 404.253591] CPU: 0 PID: 5551 Comm: modprobe Tainted: G D W 3.10.0-rc3 #1
> [ 404.253611] task: ffff880143cd8300 ti: ffff880144a2a000 task.ti: ffff880144a2a000
> [ 404.253619] RIP: 0010:[<ffffffff81334e5d>] [<ffffffff81334e5d>] device_del+0x1d/0x1d0
> [ 404.253638] RSP: 0018:ffff880144a2bcf8 EFLAGS: 00010206
> [ 404.253645] RAX: 2020302e30202030 RBX: ffff880144fdb000 RCX: 0000000000000086
> [ 404.253652] RDX: 0000000000000001 RSI: 0000000000000086 RDI: ffff880144fdb000
> [ 404.253659] RBP: ffff880144a2bd18 R08: 0000000000000651 R09: 0000000000000006
> [ 404.253666] R10: 0000000000000651 R11: 0000000000000006 R12: ffff880144fdb000
> [ 404.253673] R13: ffff880149371098 R14: ffff880144482c00 R15: ffffffffa04710e0
> [ 404.253681] FS: 00007f251c59a700(0000) GS:ffff88014e200000(0000) knlGS:0000000000000000
> [ 404.253689] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 404.253696] CR2: ffffffffff600400 CR3: 0000000145319000 CR4: 00000000001407f0
> [ 404.253703] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 404.253710] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 404.253716] Stack:
> [ 404.253720] ffff880144fdb000 ffff880143ffe000 ffff880149371098 ffffffffa0471000
> [ 404.253732] ffff880144a2bd38 ffffffff8133502d ffff88014e20cf48 ffff880143ffe1d8
> [ 404.253744] ffff880144a2bd48 ffffffffa02a4749 ffff880144a2bd58 ffffffffa02a4ba1
> [ 404.253755] Call Trace:
> [ 404.253766] [<ffffffff8133502d>] device_unregister+0x1d/0x60
> [ 404.253787] [<ffffffffa02a4749>] mei_cl_remove_device+0x9/0x10 [mei]
> [ 404.253804] [<ffffffffa02a4ba1>] mei_nfc_host_exit+0x21/0x30 [mei]
> [ 404.253819] [<ffffffffa029c2dd>] mei_stop+0x3d/0x90 [mei]
> [ 404.253830] [<ffffffffa046e220>] mei_me_remove+0x60/0xe0 [mei_me]
> [ 404.253843] [<ffffffff81278f37>] pci_device_remove+0x37/0xb0
> [ 404.253855] [<ffffffff81337c68>] __device_release_driver+0x98/0x100
> [ 404.253865] [<ffffffff81337d80>] driver_detach+0xb0/0xc0
> [ 404.253876] [<ffffffff81336b4f>] bus_remove_driver+0x8f/0x120
> [ 404.253891] [<ffffffff81075990>] ? try_to_wake_up+0x2b0/0x2b0
> [ 404.253903] [<ffffffff81338a48>] driver_unregister+0x58/0x90
> [ 404.253913] [<ffffffff8127906b>] pci_unregister_driver+0x2b/0xb0
> [ 404.253924] [<ffffffffa046f244>] mei_me_driver_exit+0x10/0xdcc [mei_me]
> [ 404.253936] [<ffffffff810a50d8>] SyS_delete_module+0x198/0x2b0
> [ 404.253949] [<ffffffff814850d9>] ? do_page_fault+0x9/0x10
> [ 404.253961] [<ffffffff81489692>] system_call_fastpath+0x16/0x1b
> [ 404.253967] Code: 41 5c 41 5d 41 5e 41 5f c9 c3 0f 1f 40 00 55 48 89 e5 41 56 41 55 41 54 49 89 fc 53 48 8b 87 88 00 00 00 4c 8b 37 48 85 c0 74 18 <48> 8b 78 78 4c 89 e2 be 02 00 00 00 48 81 c7 f8 00 00 00 e8 3b
> [ 404.254048] RIP [<ffffffff81334e5d>] device_del+0x1d/0x1d0
>
> Cc: Samuel Ortiz <sameo@...ux.intel.com>
> Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
Acked-by: Samuel Ortiz <sameo@...ux.intel.com>
Cheers,
Samuel.
--
Intel Open Source Technology Centre
http://oss.intel.com/
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