linux/drivers/char
Peter Hurley fef062cbf2 tty: Remove ASYNC_CLOSING checks in open()/hangup() methods
Since at least before 2.6.30, tty drivers that do not drop the tty lock
while closing cannot observe ASYNC_CLOSING set while holding the
tty lock; this includes the tty driver's open() and hangup() methods,
since the tty core calls these methods holding the tty lock.

For these drivers, waiting for ASYNC_CLOSING to clear while opening
is not required, since this condition cannot occur. Similarly, even
when the open() method drops and reacquires the tty lock after
blocking, ASYNC_CLOSING cannot be set (again, for drivers that
do not drop the tty lock while closing).

Now that tty port drivers no longer drop the tty lock while closing
(since 'tty: Remove tty_wait_until_sent_from_close()'), the same
conditions apply: waiting for ASYNC_CLOSING to clear while opening
is not required, nor is re-checking ASYNC_CLOSING after dropping and
reacquiring the tty lock while blocking (eg., in *_block_til_ready()).

Note: The ASYNC_CLOSING flag state is still maintained since several
bitrotting drivers use it for (dubious) other purposes.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-17 21:11:29 -07:00
..
agp Merge tag 'drm-intel-fixes-2015-07-15' into drm-intel-next-queued 2015-07-15 16:36:50 +02:00
hw_random hwrng: xgene - fix handling platform_get_irq 2015-09-21 22:57:37 +08:00
ipmi ipmi:ssif: Add a module parm to specify that SMBus alerts don't work 2015-09-03 15:02:31 -05:00
mwave
pcmcia tty: Remove ASYNC_CLOSING checks in open()/hangup() methods 2015-10-17 21:11:29 -07:00
tpm tpm, tpm_crb: fail when TPM2 ACPI table contents look corrupted 2015-07-13 23:34:12 +02:00
xilinx_hwicap char:xilinx_hwicap:buffer_icap - change 1/0 to true/false for bool type variable in function buffer_icap_set_configuration(). 2015-06-12 16:58:33 -07:00
xillybus char: xillybus: Allow 64-bit DMA on PCIe interface 2015-08-05 12:27:09 -07:00
apm-emulation.c
applicom.c
applicom.h
bfin-otp.c
bsr.c bsr: avoid format string leaking into device name 2014-07-09 16:59:15 -07:00
ds1302.c
ds1620.c
dsp56k.c drivers/char/dsp56k.c: drop check for negativity of unsigned parameter 2014-07-17 18:38:37 -07:00
dtlk.c
efirtc.c
generic_nvram.c
genrtc.c
hangcheck-timer.c hangcheck-timer: cleanup casting in hangcheck_init() 2014-11-07 11:24:01 -08:00
hpet.c ACPICA: Resources: Provide common part for struct acpi_resource_address structures. 2015-01-26 16:09:56 +01:00
Kconfig drivers/char: Remove msm_smd_pkt driver 2015-05-24 12:24:35 -07:00
lp.c
Makefile hwmon: Rename i8k driver to dell-smm-hwmon and move it to hwmon tree 2015-05-24 12:48:12 -07:00
mbcs.c
mbcs.h
mem.c switch drivers/char/mem.c to ->read_iter/->write_iter 2015-04-11 22:29:40 -04:00
misc.c char: make misc_deregister a void function 2015-08-05 10:35:49 -07:00
mmtimer.c
mspec.c
nsc_gpio.c
nvram.c char/nvram: Use bitwise OR to obtain Atari video mode data 2015-08-05 13:30:16 -07:00
nwbutton.c
nwbutton.h
nwflash.c
pc8736x_gpio.c
ppdev.c
ps3flash.c
random.c random: Remove kernel blocking API 2015-06-10 19:14:04 +08:00
raw.c writeback: separate out include/linux/backing-dev-defs.h 2015-06-02 08:33:34 -06:00
rtc.c
scx200_gpio.c
snsc_event.c
snsc.c snsc: pass timeout as HZ independent value 2015-06-01 10:29:50 +09:00
snsc.h
sonypi.c char: drop owner assignment from platform_drivers 2014-10-20 16:20:19 +02:00
tb0219.c char: drop owner assignment from platform_drivers 2014-10-20 16:20:19 +02:00
tile-srom.c fs: move struct kiocb to fs.h 2015-03-25 20:28:11 -04:00
tlclk.c
toshiba.c toshiba laptop: replace ioremap_cache with ioremap 2015-08-05 17:26:00 -07:00
ttyprintk.c
uv_mmtimer.c
virtio_console.c virtio_console: silence a static checker warning 2015-05-24 12:24:35 -07:00