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b86f86e8e7
linux/drivers/tty
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Tomas Melin b86f86e8e7 serial: 8250: fix potential deadlock in rs485-mode 
Canceling hrtimer when holding uart spinlock can deadlock.

CPU0: syscall write
          -> get uart port spinlock
              -> write uart
                  -> start_tx_rs485
                      -> hrtimer_cancel
                          -> wait for hrtimer callback to finish

CPU1: hrtimer IRQ
          -> run hrtimer
              -> em485_handle_stop_tx
                  -> get uart port spinlock

CPU0 is waiting for the hrtimer callback to finish, but the hrtimer
callback running on CPU1 is waiting to get the uart port spinlock.

This deadlock can be avoided by not canceling the hrtimers in these paths.
Setting active_timer=NULL can be done without accessing hrtimer,
and that will effectively cancel operations that would otherwise have been
performed by the hrtimer callback.

Signed-off-by: Tomas Melin <tomas.melin@vaisala.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-04 12:38:04 +01:00
..
hvc powerpc updates for 4.14 2017-09-07 10:15:40 -07:00
ipwireless networking: introduce and use skb_put_data() 2017-06-16 11:48:37 -04:00
serdev serdev: fix controller-allocation error handling 2017-10-23 11:25:48 +02:00
serial serial: 8250: fix potential deadlock in rs485-mode 2017-11-04 12:38:04 +01:00
vt tty: vt: remove multi-fetch, derive font.height from font.data 2017-10-20 14:06:45 +02:00
amiserial.c tty: amiserial: drop broken alt-speed support 2017-06-13 11:49:58 +02:00
bfin_jtag_comm.c
cyclades.c tty: cyclades: Convert timers to use timer_setup() 2017-11-04 12:01:54 +01:00
ehv_bytechan.c tty: Convert to using %pOF instead of full_name 2017-07-30 07:35:28 -07:00
goldfish.c tty: goldfish: Implement support for kernel 'earlycon' parameter 2017-08-31 18:58:45 +02:00
isicom.c tty: isicom: constify pci_device_id. 2017-07-30 07:35:27 -07:00
Kconfig Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next 2017-09-10 09:57:23 -07:00
Makefile sparc64: vcc: Enable VCC module in linux 2017-08-15 21:33:50 -07:00
metag_da.c tty: metag_da: Convert timers to use timer_setup() 2017-10-20 14:06:46 +02:00
mips_ejtag_fdc.c tty: mips_ejtag_fdc: Convert timers to use timer_setup() 2017-10-20 14:06:46 +02:00
moxa.c tty: moxa: constify pci_device_id. 2017-07-30 07:35:28 -07:00
moxa.h
mxser.c Merge 4.14-rc4 into tty-next 2017-10-09 09:05:05 +02:00
mxser.h
n_gsm.c drivers: tty: n_gsm: use setup_timer() helper. 2017-10-03 20:28:36 +02:00
n_hdlc.c format-security: move static strings to const 2017-05-08 17:15:14 -07:00
n_null.c tty: handle the case where we cannot restore a line discipline 2017-06-03 18:43:46 +09:00
n_r3964.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
n_tracerouter.c
n_tracesink.c
n_tracesink.h
n_tty.c
nozomi.c tty: nozomi: avoid sprintf buffer overflow 2016-11-29 20:20:07 +01:00
pty.c TTY/Serial updates for 4.14-rc1 2017-09-05 10:30:48 -07:00
rocket_int.h
rocket.c tty: rocket: drop broken alt-speed support 2017-06-13 11:49:58 +02:00
rocket.h
synclink_gt.c tty: synclink_gt: constify pci_device_id. 2017-07-30 07:35:28 -07:00
synclink.c tty: synclink: Reuse an existing error handling path 2017-09-18 18:31:48 +02:00
synclinkmp.c tty: synclinkmp: constify pci_device_id. 2017-07-30 07:35:27 -07:00
sysrq.c tty/sysrq: Convert timers to use timer_setup() 2017-10-20 14:06:46 +02:00
tty_audit.c
tty_baudrate.c tty: move baudrate handling code to a file of its own 2017-04-18 18:01:52 +02:00
tty_buffer.c tty: fix tty_ldisc_receive_buf() documentation 2017-11-04 12:08:53 +01:00
tty_io.c Staging/IIO driver updates for 4.14-rc1 2017-09-05 10:36:26 -07:00
tty_ioctl.c tty: move baudrate handling code to a file of its own 2017-04-18 18:01:52 +02:00
tty_jobctrl.c tty: split job control support into a file of its own 2017-04-18 18:01:52 +02:00
tty_ldisc.c TTY/Serial patches for 4.13-rc1 2017-07-03 20:04:16 -07:00
tty_ldsem.c sched/headers: Prepare to move the get_task_struct()/put_task_struct() and related APIs from <linux/sched.h> to <linux/sched/task.h> 2017-03-02 08:42:40 +01:00
tty_mutex.c
tty_port.c ttyport: trivial fix for some typo in comments 2017-09-18 18:31:48 +02:00
vcc.c tty: vcc: Convert timers to use timer_setup() 2017-11-04 12:01:54 +01:00