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a9ee77af75
linux/net/bluetooth
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Sebastian Andrzej Siewior a9ee77af75 Bluetooth: avoid recursive locking in hci_send_to_channel() 
Mart reported a deadlock in -RT in the call path:
  hci_send_monitor_ctrl_event() -> hci_send_to_channel()

because both functions acquire the same read lock hci_sk_list.lock. This
is also a mainline issue because the qrwlock implementation is writer
fair (the traditional rwlock implementation is reader biased).

To avoid the deadlock there is now __hci_send_to_channel() which expects
the readlock to be held.

Fixes: 38ceaa00d0 ("Bluetooth: Add support for sending MGMT commands and events to monitor")
Reported-by: Mart van de Wege <mvdwege@gmail.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2017-10-30 09:04:07 +01:00
..
bnep Bluetooth: bnep: fix possible might sleep error in bnep_session 2017-06-27 19:32:11 +02:00
cmtp Bluetooth: cmtp: fix possible might sleep error in cmtp_session 2017-06-27 19:32:11 +02:00
hidp HID: introduce hid_is_using_ll_driver 2017-07-27 15:14:28 +02:00
rfcomm Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next 2017-07-01 15:57:29 -07:00
6lowpan.c 6lowpan: fix set not used warning 2017-07-25 12:31:37 -07:00
a2mp.c networking: make skb_pull & friends return void pointers 2017-06-16 11:48:39 -04:00
a2mp.h Bluetooth: Add BT_HS config option 2015-07-30 13:31:59 +02:00
af_bluetooth.c net: convert sock.sk_refcnt from atomic_t to refcount_t 2017-07-01 07:39:08 -07:00
amp.c Bluetooth: fix assignments on error variable err 2017-04-12 22:02:38 +02:00
amp.h Bluetooth: Add BT_HS config option 2015-07-30 13:31:59 +02:00
ecdh_helper.c Bluetooth: let the crypto subsystem generate the ecc privkey 2017-10-06 20:35:47 +02:00
ecdh_helper.h Bluetooth: let the crypto subsystem generate the ecc privkey 2017-10-06 20:35:47 +02:00
hci_conn.c Bluetooth: Fix potential memory leak 2017-10-29 14:07:10 +01:00
hci_core.c bluetooth: remove WQ_MEM_RECLAIM from hci workqueues 2017-06-29 14:36:38 +02:00
hci_debugfs.c Bluetooth: Add debugfs fields for hardware and firmware info 2016-07-18 09:33:28 +03:00
hci_debugfs.h Bluetooth: Provide option to enable/disable debugfs information 2015-02-15 18:54:13 +02:00
hci_event.c Bluetooth: fix spelling mistake: "advetising" -> "advertising" 2017-02-16 17:39:35 +01:00
hci_request.c Bluetooth: Fix potential memory leak 2017-10-29 14:07:10 +01:00
hci_request.h Bluetooth: Fix potential memory leak 2017-10-29 14:07:10 +01:00
hci_sock.c Bluetooth: avoid recursive locking in hci_send_to_channel() 2017-10-30 09:04:07 +01:00
hci_sysfs.c Bluetooth: make device_type const 2017-08-19 11:55:31 +02:00
Kconfig Revert "Bluetooth: Add option for disabling legacy ioctl interfaces" 2017-09-28 13:20:32 -07:00
l2cap_core.c Bluetooth: Properly check L2CAP config option output buffer length 2017-09-09 17:56:05 -07:00
l2cap_sock.c Bluetooth: Add sockaddr length checks before accessing sa_family in bind and connect handlers 2017-06-29 14:37:57 +02:00
leds.c Bluetooth: Add combined LED trigger for controller power 2016-09-19 20:19:34 +02:00
leds.h Bluetooth: Add combined LED trigger for controller power 2016-09-19 20:19:34 +02:00
lib.c Bluetooth: make baswap src const 2017-09-01 22:49:47 +02:00
Makefile Bluetooth: convert smp and selftest to crypto kpp API 2017-04-25 04:53:42 +02:00
mgmt_util.c networking: make skb_push & __skb_push return void pointers 2017-06-16 11:48:40 -04:00
mgmt_util.h Bluetooth: Add generic mgmt helper API 2015-03-17 18:03:08 +01:00
mgmt.c Bluetooth: Fix potential memory leak 2017-10-29 14:07:10 +01:00
sco.c Bluetooth: Add sockaddr length checks before accessing sa_family in bind and connect handlers 2017-06-29 14:37:57 +02:00
selftest.c Bluetooth: Fix compiler warning with selftest duration calculation 2017-10-06 21:49:13 +03:00
selftest.h Bluetooth: Add support for self testing framework 2014-12-30 08:53:55 +02:00
smp.c Bluetooth: let the crypto subsystem generate the ecc privkey 2017-10-06 20:35:47 +02:00
smp.h Bluetooth: SMP: Add support for H7 crypto function and CT2 auth flag 2016-12-08 07:50:24 +01:00