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Peter Hurley f8747d4a46 tty: Fix pty master read() after slave closes 
Commit f95499c303,
  n_tty: Don't wait for buffer work in read() loop
creates a race window which can cause a pty master read()
to miss the last pty slave write(s) and return -EIO instead,
thus signalling the pty slave is closed. This can happen when
the pty slave is written and immediately closed but before the
tty buffer i/o loop receives the new input; the pty master
read() is scheduled, sees its read buffer is empty and the
pty slave has been closed, and exits.

Because tty_flush_to_ldisc() has significant performance impact
for parallel i/o, rather than revert the commit, special case this
condition (ie., when the read buffer is empty and the 'other' pty
has been closed) and, only then, wait for buffer work to complete
before re-testing if the read buffer is still empty.

As before, subsequent pty master reads return any available data
until no more data is available, and then returns -EIO to
indicate the pty slave has closed.

Reported-by: Mikael Pettersson <mikpelinux@gmail.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Tested-by: Mikael Pettersson <mikpelinux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2013-09-30 19:05:56 -07:00
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accessibility
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acpi ACPI / scan: fix typo in comments of acpi_bus_unregister_driver() 2013-09-25 19:46:48 +02:00
amba
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ata update contact information for Mikael Pettersson 2013-09-25 13:27:42 -07:00
atm atm: nicstar: fix regression made by previous patch 2013-09-15 22:18:55 -04:00
auxdisplay
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base driver core : Fix use after free of dev->parent in device_shutdown 2013-09-26 14:46:11 -07:00
bcma bcma: fix error code handling on 64 Bit systems 2013-09-09 14:44:33 -04:00
block cciss: fix info leak in cciss_ioctl32_passthru() 2013-09-24 17:00:26 -07:00
bluetooth
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bus ARM: SoC platform changes for 3.12 2013-09-06 13:30:06 -07:00
cdrom
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char Bug-fixes: 2013-09-25 15:50:53 -07:00
clk The common clk framework changes for 3.12 are dominated by clock driver 2013-09-09 15:49:04 -07:00
clocksource clocksource: em_sti: Set cpu_possible_mask to fix SMP broadcast 2013-09-26 02:31:04 +02:00
connector
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cpufreq cpufreq: exynos5440: Fix potential NULL pointer dereference 2013-09-25 03:25:58 +02:00
cpuidle ACPI and power management fixes for 3.12-rc1 2013-09-12 11:22:45 -07:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux 2013-09-07 12:53:35 +10:00
dca
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devfreq
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dio
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dma Remove GENERIC_HARDIRQ config option 2013-09-13 15:09:52 +02:00
edac Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2013-09-06 11:14:33 -07:00
eisa
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extcon Driver core patches for 3.12-rc1 2013-09-03 11:37:15 -07:00
firewire
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firmware firmware/dmi_scan: drop OOM messages 2013-09-11 15:58:51 -07:00
fmc
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gpio Remove GENERIC_HARDIRQ config option 2013-09-13 15:09:52 +02:00
gpu Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux 2013-09-29 10:02:40 -07:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2013-09-17 21:54:05 -04:00
hsi
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hv Drivers: hv: vmbus: Terminate vmbus version negotiation on timeout 2013-09-26 14:20:22 -07:00
hwmon hwmon: (applesmc) Check key count before proceeding 2013-09-26 03:48:43 -07:00
hwspinlock
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i2c i2c: ismt: initialize DMA buffer 2013-09-28 16:32:12 +02:00
ide ide: sgiioc4: Staticize ioc4_ide_attach_one() 2013-09-05 15:21:30 -04:00
idle
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iio iio:buffer_cb: Add missing iio_buffer_init() 2013-09-21 12:52:50 +01:00
infiniband Remove GENERIC_HARDIRQ config option 2013-09-13 15:09:52 +02:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2013-09-15 07:13:39 -04:00
iommu IOMMU Updates for Linux v3.12 2013-09-12 11:29:26 -07:00
ipack
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irqchip ARM: SoC late changes for v3.12 2013-09-09 16:35:29 -07:00
isdn isdn: hfcpci_softirq: get func return to suppress compiler warning 2013-09-15 22:27:04 -04:00
leds Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds 2013-09-12 11:35:33 -07:00
lguest lguest: fix guest kernel stack overflow when TF bit set. 2013-09-06 08:09:27 +09:30
macintosh
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mailbox mailbox: remove unnecessary platform_set_drvdata() 2013-09-18 12:02:00 -07:00
md A set of device-mapper fixes for 3.12. 2013-09-25 15:12:46 -07:00
media Remove GENERIC_HARDIRQ config option 2013-09-13 15:09:52 +02:00
memory ARM: SoC platform changes for 3.12 2013-09-06 13:30:06 -07:00
memstick memstick: add support for legacy memorysticks 2013-09-11 15:59:35 -07:00
message
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mfd Remove GENERIC_HARDIRQ config option 2013-09-13 15:09:52 +02:00
misc mei: cancel stall timers in mei_reset 2013-09-26 13:56:53 -07:00
mmc Remove GENERIC_HARDIRQ config option 2013-09-13 15:09:52 +02:00
mtd mtd: nand: pxa3xx: Remove unneeded ifdef CONFIG_OF 2013-09-17 09:08:14 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-09-19 13:57:28 -05:00
nfc
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ntb ntb: clean up unnecessary MSI/MSI-X capability find 2013-09-05 11:08:01 -07:00
nubus
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of Merge branch 'for-v3.12-fix' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping 2013-09-11 19:11:59 -07:00
oprofile oprofile: get rid of pointless forward declarations of struct super_block 2013-09-03 22:52:48 -04:00
parisc PCI changes for the v3.12 merge window: 2013-09-03 16:24:35 -07:00
parport
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pci PCI: Workaround missing pci_set_master in pci drivers 2013-09-28 13:25:30 -07:00
pcmcia
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pinctrl PTR_RET() is a weird name, and led to some confusing usage. We ended 2013-09-04 17:31:11 -07:00
platform Merge branch 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86 2013-09-15 17:42:59 -04:00
pnp pnp: change pnp bus pm_ops to invoke pnp driver dev_pm_ops if specified 2013-09-11 15:58:15 -07:00
power Remove GENERIC_HARDIRQ config option 2013-09-13 15:09:52 +02:00
pps Remove GENERIC_HARDIRQ config option 2013-09-13 15:09:52 +02:00
ps3
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ptp
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pwm ARM: SoC cleanups for 3.12 2013-09-06 13:21:16 -07:00
rapidio
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regulator PTR_RET() is a weird name, and led to some confusing usage. We ended 2013-09-04 17:31:11 -07:00
remoteproc
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reset
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rpmsg
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rtc rtc: simplify devm_request_mem_region/devm_ioremap 2013-09-11 15:58:59 -07:00
s390 s390/vmcore: use vmcore for zfcpdump 2013-09-11 15:59:15 -07:00
sbus
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scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-09-19 13:57:28 -05:00
sfi
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sh
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sn
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spi Remove GENERIC_HARDIRQ config option 2013-09-13 15:09:52 +02:00
ssb
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staging staging: r8188eu: Add new device ID 2013-09-26 16:44:45 -07:00
target Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2013-09-12 16:11:45 -07:00
tc
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thermal drivers: thermal: add check when unregistering cpu cooling 2013-09-03 09:10:34 -04:00
tty tty: Fix pty master read() after slave closes 2013-09-30 19:05:56 -07:00
uio Driver core patches for 3.12-rc1 2013-09-03 11:37:15 -07:00
usb usb: dwc3: add support for Merrifield 2013-09-26 16:22:29 -07:00
uwb
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vfio vfio-pci: PCI hot reset interface 2013-09-04 11:28:04 -06:00
vhost vhost-scsi: whitespace tweak 2013-09-17 22:56:09 +03:00
video video: mxsfb: Add missing break 2013-09-26 15:33:23 +03:00
virt
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virtio virtio_pci: pm: Use CONFIG_PM_SLEEP instead of CONFIG_PM 2013-09-09 10:02:53 +09:30
vlynq
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vme
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w1 Remove GENERIC_HARDIRQ config option 2013-09-13 15:09:52 +02:00
watchdog Merge git://www.linux-watchdog.org/linux-watchdog 2013-09-12 08:45:53 -07:00
xen Bug-fixes: 2013-09-25 15:50:53 -07:00
zorro
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Kconfig
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Makefile
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