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853a9ae29e
linux/drivers/tty
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Johan Hovold 853a9ae29e serial: 8250: fix handle_irq locking 
The 8250 handle_irq callback is not just called from the interrupt
handler but also from a timer callback when polling (e.g. for ports
without an interrupt line). Consequently the callback must explicitly
disable interrupts to avoid a potential deadlock with another interrupt
in polled mode.

Add back an irqrestore-version of the sysrq port-unlock helper and use
it in the 8250 callbacks that need it.

Fixes: 75f4e830fa ("serial: do not restore interrupt state in sysrq helper")
Cc: stable@vger.kernel.org	# 5.13
Cc: Joel Stanley <joel@jms.id.au>
Cc: Andrew Jeffery <andrew@aj.id.au>
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210714080427.28164-1-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-07-21 12:53:26 +02:00
..
hvc TTY / Serial patches for 5.14-rc1 2021-07-05 14:08:24 -07:00
ipwireless ipwireless: remove unused ipw_tty::closing 2021-06-15 14:02:43 +02:00
serdev tty: serdev: core: Fix misspelled function name __serdev_device_driver_register() 2021-05-20 17:05:34 +02:00
serial serial: 8250: fix handle_irq locking 2021-07-21 12:53:26 +02:00
vt Merge 5.13-rc4 into tty-next 2021-05-31 09:44:28 +02:00
amiserial.c tty: make tty_operations::chars_in_buffer return uint 2021-05-13 18:29:11 +02:00
ehv_bytechan.c tty: make tty_operations::write_room return uint 2021-05-13 17:03:20 +02:00
goldfish.c tty: make tty_operations::chars_in_buffer return uint 2021-05-13 18:29:11 +02:00
Kconfig This pull request contains the following changes for UML: 2021-07-09 10:19:13 -07:00
Makefile tty: remove broken r3964 line discipline 2021-05-13 16:57:15 +02:00
mips_ejtag_fdc.c tty: make tty_operations::chars_in_buffer return uint 2021-05-13 18:29:11 +02:00
moxa.c tty: make tty_operations::chars_in_buffer return uint 2021-05-13 18:29:11 +02:00
moxa.h tty: fix spelling mistake 2020-06-27 16:21:20 +02:00
mxser.c mxser: introduce mxser_16550A_or_MUST helper 2021-06-18 13:10:03 +02:00
n_gsm.c tty: n_gsm: Fix function naming and provide missing param descriptions 2021-05-20 17:06:17 +02:00
n_hdlc.c tty: n_hdlc: Fix a little doc-rot in n_hdlc_tty_read() 2021-05-20 17:06:17 +02:00
n_null.c tty: make tty_ldisc_ops a param in tty_unregister_ldisc 2021-05-13 16:57:16 +02:00
n_tty.c tty: drop tty_ldisc_ops::refcount 2021-05-13 16:57:17 +02:00
nozomi.c tty: nozomi: Fix the error handling path of 'nozomi_card_init()' 2021-05-27 15:20:02 +02:00
pty.c tty: pty: correct function name pty_resize() 2021-05-20 16:33:06 +02:00
synclink_gt.c tty: make use of tty_get_{char,frame}_size 2021-06-15 14:03:27 +02:00
sysrq.c tty/sysrq: Fix issues of code indent should use tabs 2021-04-10 10:33:00 +02:00
tty_audit.c tty: audit: move some local functions out of tty.h 2021-04-15 10:24:58 +02:00
tty_baudrate.c tty: tty_baudrate: Fix coding style issues of block comments 2021-05-13 18:29:12 +02:00
tty_buffer.c tty: tty_buffer: Fix incorrectly documented function __tty_buffer_request_room() 2021-05-20 17:06:15 +02:00
tty_io.c tty: fix kernel-doc for {start,stop}_tty 2021-05-20 16:59:14 +02:00
tty_ioctl.c tty: make tty_get_{char,frame}_size available 2021-06-15 14:03:26 +02:00
tty_jobctrl.c tty: tty_jobctrl: Fix 2 incorrectly documented functions 2021-05-20 17:06:15 +02:00
tty_ldisc.c tty: tty_ldisc: fix doc warnings in tty_ldisc.c 2021-06-09 14:43:23 +02:00
tty_ldsem.c
tty_mutex.c tty: move some internal tty lock enums and functions out of tty.h 2021-04-15 10:26:58 +02:00
tty_port.c tty: tty_port: Fix coding style issues of block comments 2021-05-13 18:29:13 +02:00
tty.h tty: clean include/linux/tty.h up 2021-04-15 10:32:17 +02:00
ttynull.c tty: make tty_operations::write_room return uint 2021-05-13 17:03:20 +02:00
vcc.c TTY / Serial patches for 5.14-rc1 2021-07-05 14:08:24 -07:00