From 147e2d59833e994cc99341806a88b9e59be41391 Mon Sep 17 00:00:00 2001 From: Dave Young Date: Wed, 5 Mar 2008 18:45:59 -0800 Subject: [PATCH] bluetooth: hci_core: defer hci_unregister_sysfs() Alon Bar-Lev reports: Feb 16 23:41:33 alon1 usb 3-1: configuration #1 chosen from 1 choice Feb 16 23:41:33 alon1 BUG: unable to handle kernel NULL pointer dereference at virtual address 00000008 Feb 16 23:41:33 alon1 printing eip: c01b2db6 *pde = 00000000 Feb 16 23:41:33 alon1 Oops: 0000 [#1] PREEMPT Feb 16 23:41:33 alon1 Modules linked in: ppp_deflate zlib_deflate zlib_inflate bsd_comp ppp_async rfcomm l2cap hci_usb vmnet(P) vmmon(P) tun radeon drm autofs4 ipv6 aes_generic crypto_algapi ieee80211_crypt_ccmp nf_nat_irc nf_nat_ftp nf_conntrack_irc nf_conntrack_ftp ipt_MASQUERADE iptable_nat nf_nat ipt_REJECT xt_tcpudp ipt_LOG xt_limit xt_state nf_conntrack_ipv4 nf_conntrack iptable_filter ip_tables x_tables snd_pcm_oss snd_mixer_oss snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device bluetooth ppp_generic slhc ioatdma dca cfq_iosched cpufreq_powersave cpufreq_ondemand cpufreq_conservative acpi_cpufreq freq_table uinput fan af_packet nls_cp1255 nls_iso8859_1 nls_utf8 nls_base pcmcia snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm nsc_ircc snd_timer ipw2200 thinkpad_acpi irda snd ehci_hcd yenta_socket uhci_hcd psmouse ieee80211 soundcore intel_agp hwmon rsrc_nonstatic pcspkr e1000 crc_ccitt snd_page_alloc i2c_i801 ieee80211_crypt pcmcia_core agpgart thermal bat! tery nvram rtc sr_mod ac sg firmware_class button processor cdrom unix usbcore evdev ext3 jbd ext2 mbcache loop ata_piix libata sd_mod scsi_mod Feb 16 23:41:33 alon1 Feb 16 23:41:33 alon1 Pid: 4, comm: events/0 Tainted: P (2.6.24-gentoo-r2 #1) Feb 16 23:41:33 alon1 EIP: 0060:[] EFLAGS: 00010282 CPU: 0 Feb 16 23:41:33 alon1 EIP is at sysfs_get_dentry+0x26/0x80 Feb 16 23:41:33 alon1 EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: f48a2210 Feb 16 23:41:33 alon1 ESI: f72eb900 EDI: f4803ae0 EBP: f4803ae0 ESP: f7c49efc Feb 16 23:41:33 alon1 hcid[7004]: HCI dev 0 registered Feb 16 23:41:33 alon1 DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 Feb 16 23:41:33 alon1 Process events/0 (pid: 4, ti=f7c48000 task=f7c3efc0 task.ti=f7c48000) Feb 16 23:41:33 alon1 Stack: f7cb6140 f4822668 f7e71e10 c01b304d ffffffff ffffffff fffffffe c030ba9c Feb 16 23:41:33 alon1 f7cb6140 f4822668 f6da6720 f7cb6140 f4822668 f6da6720 c030ba8e c01ce20b Feb 16 23:41:33 alon1 f6e9dd00 c030ba8e f6da6720 f6e9dd00 f6e9dd00 00000000 f4822600 00000000 Feb 16 23:41:33 alon1 Call Trace: Feb 16 23:41:33 alon1 [] sysfs_move_dir+0x3d/0x1f0 Feb 16 23:41:33 alon1 [] kobject_move+0x9b/0x120 Feb 16 23:41:33 alon1 [] device_move+0x51/0x110 Feb 16 23:41:33 alon1 [] del_conn+0x0/0x70 [bluetooth] Feb 16 23:41:33 alon1 [] del_conn+0x19/0x70 [bluetooth] Feb 16 23:41:33 alon1 [] run_workqueue+0x81/0x140 Feb 16 23:41:33 alon1 [] schedule+0x168/0x2e0 Feb 16 23:41:33 alon1 [] autoremove_wake_function+0x0/0x50 Feb 16 23:41:33 alon1 [] worker_thread+0x9b/0xf0 Feb 16 23:41:33 alon1 [] autoremove_wake_function+0x0/0x50 Feb 16 23:41:33 alon1 [] worker_thread+0x0/0xf0 Feb 16 23:41:33 alon1 [] kthread+0x42/0x70 Feb 16 23:41:33 alon1 [] kthread+0x0/0x70 Feb 16 23:41:33 alon1 [] kernel_thread_helper+0x7/0x18 Feb 16 23:41:33 alon1 ======================= Feb 16 23:41:33 alon1 Code: 26 00 00 00 00 57 89 c7 a1 50 1b 3a c0 56 53 8b 70 38 85 f6 74 08 8b 0e 85 c9 74 58 ff 06 8b 56 50 39 fa 74 47 89 fb eb 02 89 c3 <8b> 43 08 39 c2 75 f7 8b 46 08 83 c0 68 e8 98 e7 10 00 8b 43 10 Feb 16 23:41:33 alon1 EIP: [] sysfs_get_dentry+0x26/0x80 SS:ESP 0068:f7c49efc Feb 16 23:41:33 alon1 ---[ end trace aae864e9592acc1d ]--- Defer hci_unregister_sysfs because hci device could be destructed while hci conn devices still there. Signed-off-by: Dave Young Tested-by: Stefan Seyfried Acked-by: Alon Bar-Lev Signed-off-by: Andrew Morton Acked-by: Marcel Holtmann --- net/bluetooth/hci_core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 930b58e7149a..aec6929f5c16 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -902,8 +902,6 @@ int hci_unregister_dev(struct hci_dev *hdev) BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type); - hci_unregister_sysfs(hdev); - write_lock_bh(&hci_dev_list_lock); list_del(&hdev->list); write_unlock_bh(&hci_dev_list_lock); @@ -915,6 +913,8 @@ int hci_unregister_dev(struct hci_dev *hdev) hci_notify(hdev, HCI_DEV_UNREG); + hci_unregister_sysfs(hdev); + __hci_dev_put(hdev); return 0; -- 2.20.1