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Alan Cox 638b9648ab tty: Fix the ldisc hangup race 
This was noticed by Matthias Urlichs and he proposed a fix. This patch
does the fixing a different way to avoid introducing several new race
conditions into the code.

The problem case is TTY_DRIVER_RESET_TERMIOS = 0. In that case while we
abort the ldisc change, the hangup processing has not cleaned up and restarted
the ldisc either.

We can't restart the ldisc stuff in the set_ldisc as we don't know what
the hangup did and may touch stuff we shouldn't as we are no longer
supposed to influence the tty at that point in case it has been re-opened
before we get rescheduled.

Instead do it the simple way. Always re-init the ldisc on the hangup, but
use TTY_DRIVER_RESET_TERMIOS to indicate that we should force N_TTY.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
 		2010-03-02 14:43:22 -08:00
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accessibility
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acpi Merge branch 'acpica' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2010-03-01 10:36:22 -08:00
amba
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ata Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev 2010-03-01 13:04:58 -08:00
atm
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auxdisplay
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base PM: Allow device drivers to use dpm_wait() 2010-02-26 20:39:11 +01:00
block Merge branch 'for-2.6.34' of git://git.kernel.dk/linux-2.6-block 2010-03-01 09:00:29 -08:00
bluetooth
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cdrom block: Consolidate phys_segment and hw_segment limits 2010-02-26 13:58:08 +01:00
char tty: Fix the ldisc hangup race 2010-03-02 14:43:22 -08:00
clocksource Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-03-01 08:48:25 -08:00
connector
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cpufreq
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cpuidle
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crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2010-02-26 16:50:02 -08:00
dca
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dio
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dma
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edac
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eisa
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firewire block: Rename blk_queue_max_sectors to blk_queue_max_hw_sectors 2010-02-26 13:58:08 +01:00
firmware drivers/firmware/iscsi_ibft.c: remove NIPQUAD_FMT, use %pI4 2010-02-26 21:02:14 +00:00
gpio
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gpu Merge branch 'x86-pci-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-02-28 10:59:18 -08:00
hid Merge branches 'upstream', 'raw_report_modifications' and 'apple_magic_mouse' into for-linus 2010-02-25 17:39:16 +01:00
hwmon
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i2c Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2010-03-01 09:15:15 -08:00
ide Merge branch 'acpica' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2010-03-01 10:36:22 -08:00
idle
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ieee1394 block: Rename blk_queue_max_sectors to blk_queue_max_hw_sectors 2010-02-26 13:58:08 +01:00
ieee802154
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infiniband
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input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2010-03-01 10:38:09 -08:00
isdn PCI: push deprecated pci_find_device() function to last user 2010-02-22 16:17:01 -08:00
leds
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lguest
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macintosh Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2010-03-01 10:38:09 -08:00
mca
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md block: Consolidate phys_segment and hw_segment limits 2010-02-26 13:58:08 +01:00
media Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6 2010-02-26 17:16:20 -08:00
memstick block: Consolidate phys_segment and hw_segment limits 2010-02-26 13:58:08 +01:00
message Merge branch 'for-2.6.34' of git://git.kernel.dk/linux-2.6-block 2010-03-01 09:00:29 -08:00
mfd Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6 2010-03-01 08:58:44 -08:00
misc
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mmc sdio_uart: Use kfifo instead of the messy circ stuff 2010-03-02 14:43:20 -08:00
mtd MIPS: Alchemy: physmap-flash for all devboards 2010-02-27 12:52:59 +01:00
net Merge branch 'davinci-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-davinci 2010-03-01 13:05:40 -08:00
nubus
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of
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oprofile
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parisc
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parport serial: 8250_pci: add support for MCS9865 / SYBA 6x Serial Port Card 2010-03-02 14:43:08 -08:00
pci Merge branch 'acpica' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2010-03-01 10:36:22 -08:00
pcmcia Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus 2010-02-27 16:19:22 -08:00
platform Merge branch 'acpica' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2010-03-01 10:36:22 -08:00
pnp
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power
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pps
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ps3
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rapidio
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regulator
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rtc Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2010-03-01 09:15:15 -08:00
s390 Merge branch 'for-2.6.34' of git://git.kernel.dk/linux-2.6-block 2010-03-01 09:00:29 -08:00
sbus
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scsi Merge branch 'for-2.6.34' of git://git.kernel.dk/linux-2.6-block 2010-03-01 09:00:29 -08:00
serial serial: timberdale: Remove dependancies 2010-03-02 14:43:21 -08:00
sfi
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sh sh: Use dummy_irq_chip for INTC redirect vectors. 2010-02-17 12:37:42 +09:00
sn
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spi Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2010-03-01 09:15:15 -08:00
ssb
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staging libata: Pass host flags into the pci helper 2010-03-01 14:58:46 -05:00
tc
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telephony
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thermal
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uio
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usb tty: declare MODULE_FIRMWARE in various drivers 2010-03-02 14:43:15 -08:00
uwb
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video Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k 2010-02-27 16:22:47 -08:00
virtio virtio: fix out of range array access 2010-02-28 20:39:11 +02:00
vlynq
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w1
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watchdog Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2010-03-01 09:15:15 -08:00
xen
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zorro
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Kconfig
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Makefile
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