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38db89799b
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Alan Cox 38db89799b tty: throttling race fix 
The tty throttling code can race due to the lock drops. It takes very high
loads but this has been observed and verified by Rob Duncan.

The basic problem is that on an SMP box we can go

	CPU #1				CPU #2
	need to throttle ?
	suppose we should		buffer space cleared
					are we throttled
					yes ? - unthrottle
	call throttle method

This changeet take the termios lock to protect against this. The termios
lock isn't the initial obvious candidate but many implementations of throttle
methods already need to poke around their own termios structures (and nobody
really locks them against a racing change of flow control).

This does mean that anyone who is setting tty->low_latency = 1 and then
calling tty_flip_buffer_push from their unthrottle method is going to end up
collapsing in a pile of locks. However we've removed all the known bogus
users of low_latency = 1 and such use isn't safe anyway for other reasons so
catching it would be an improvement.

Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-11 08:50:59 -07:00
..
accessibility
acpi cpumask: alloc zeroed cpumask for static cpumask_var_ts 2009-06-09 22:30:27 +09:30
amba
ata pata_netcell: Fix typo 2009-06-08 09:12:28 -07:00
atm Replace all DMA_nBIT_MASK macro with DMA_BIT_MASK(n) 2009-04-13 15:04:33 -07:00
auxdisplay
base Driver Core: do not oops when driver_unregister() is called for unregistered drivers 2009-05-28 14:24:07 -07:00
block xen/blkfront: fix warning when deleting gendisk on unplug/shutdown 2009-05-19 08:27:42 +02:00
bluetooth
cdrom cdrom: beyond ARRAY_SIZE of viocd_diskinfo 2009-05-20 08:42:06 +02:00
char tty: throttling race fix 2009-06-11 08:50:59 -07:00
clocksource clocksource: pass clocksource to read() callback 2009-04-21 13:41:47 -07:00
connector
cpufreq cpumask: alloc zeroed cpumask for static cpumask_var_ts 2009-06-09 22:30:27 +09:30
cpuidle
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2009-05-17 15:48:05 -07:00
dca
dio
dma Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2009-05-30 07:57:44 -07:00
edac edac: AMD8111 & AMD8131 Kconfig fixup 2009-05-29 08:40:03 -07:00
eisa
firewire
firmware ibft: fix the display of a few fields in the NIC attribute structure in sysfs 2009-05-02 15:36:10 -07:00
gpio Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-04-03 15:24:35 -07:00
gpu Revert "drm: don't associate _DRM_DRIVER maps with a master" 2009-06-05 10:21:52 -07:00
hid HID: add NOGET quirk for devices from CH Products 2009-05-11 17:09:21 +02:00
hwmon hwmon: (lm78) Add missing __devexit_p() 2009-06-01 13:46:49 +02:00
i2c Merge branch 'i2c-for-2630-rc5' of git://aeryn.fluff.org.uk/bjdooks/linux 2009-05-12 11:21:51 -07:00
ide pdc202xx_old: fix resetproc() method 2009-06-07 13:52:50 +02:00
idle i7300_idle: allow testing on i5000-series hardware w/o re-compile 2009-05-28 20:52:40 -04:00
ieee1394 dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32) 2009-04-07 08:31:11 -07:00
infiniband Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2009-05-13 16:31:12 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2009-05-29 08:48:25 -07:00
isdn gigaset: beyond ARRAY_SIZE of iwb->data 2009-05-21 15:04:15 -07:00
leds leds: just ignore invalid GPIOs in leds-gpio 2009-04-08 14:13:48 +01:00
lguest lguest: fix on Intel when KVM loaded (unhandled trap 13) 2009-05-26 12:13:11 -07:00
macintosh Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6 2009-04-24 08:16:05 -07:00
mca
md md/raid5: fix bug in reshape code when chunk_size decreases. 2009-06-09 16:32:22 +10:00
media ivtv: Fix PCI DMA direction 2009-06-05 08:05:23 -07:00
memstick dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32) 2009-04-07 08:31:11 -07:00
message scsi: mpt: suppress debugobjects warning 2009-04-21 13:41:50 -07:00
mfd mfd: pcf50633: fix unsafe disable_irq() 2009-05-19 22:22:28 +02:00
misc [SCSI] ses: fix problems caused by empty SES provided name 2009-05-15 12:20:57 -04:00
mmc sdhci-of: Fix the wrong accessor to HOSTVER register 2009-06-03 21:56:22 +02:00
mtd mtd: davinci nand: update clock naming 2009-06-05 11:54:17 -07:00
net r8169: fix crash when large packets are received 2009-06-09 04:01:02 -07:00
nubus
of
oprofile oprofile: fix cpu buffer size 2009-05-07 17:28:59 +02:00
parisc parport: Fix various uses of parport_pc 2009-04-14 08:48:50 -07:00
parport parport: quickfix the proc registration bug 2009-06-02 09:53:22 -07:00
pci PCI: use fixed-up device class when configuring device 2009-06-04 11:29:43 +01:00
pcmcia [ARM] 5458/1: pcmcia: pxa2xx-sharpsl: check if we do have Scoop config 2009-04-23 23:25:40 +01:00
platform eeepc-laptop: unregister_rfkill_notifier on failure 2009-05-14 11:28:27 -04:00
pnp ACPI: suspend: don't let device _PS3 failure prevent suspend 2009-05-08 00:22:29 -04:00
power Merge git://git.infradead.org/battery-2.6 2009-04-08 17:45:02 -07:00
ps3
rapidio dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32) 2009-04-07 08:31:11 -07:00
regulator regulator: da903x: add missing __devexit_p() 2009-05-18 11:21:10 +01:00
rtc [ARM] 5519/1: amba probe: pass "struct amba_id *" instead of void * 2009-05-20 23:26:51 +01:00
s390 [SCSI] zfcp: Fix oops when port disappears 2009-04-27 10:07:37 -05:00
sbus sbus: changed ioctls to unlocked 2009-04-14 19:46:19 -07:00
scsi [SCSI] mpt2sas: fix driver version inconsistency 2009-05-18 14:17:17 -05:00
serial 8250_pci: add the OXCB950 chip to the 8250 PCI driver. 2009-06-11 08:50:58 -07:00
sh sh: intc: Added resume from hibernation support to the intc 2009-04-06 08:55:19 -07:00
sn dma-mapping: replace all DMA_64BIT_MASK macro with DMA_BIT_MASK(64) 2009-04-07 08:31:10 -07:00
spi pxa2xx_spi: prevent panic case setup() fails 2009-05-12 14:11:34 -07:00
ssb SSB: BCM47xx: Export ssb_watchdog_timer_set 2009-06-08 16:57:50 +01:00
staging Staging: comedi: David doesn't want to get comedi patches 2009-05-08 19:39:28 -07:00
tc
telephony
thermal thermal: fix off-by-1 error in trip point trigger condition 2009-05-14 13:40:53 -04:00
uio UIO: fix specific device driver missing statement for depmod 2009-04-16 16:17:11 -07:00
usb tty: Clean up the ACM driver to CodingStyle 2009-06-11 08:50:58 -07:00
uwb dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32) 2009-04-07 08:31:11 -07:00
video atmel_lcdfb: correct fifo size for some products 2009-05-29 08:40:03 -07:00
virtio virtio: fix suspend when using virtio_balloon 2009-04-19 23:14:01 +09:30
w1 mfd: remove DS1WM clock handling 2009-04-05 00:32:22 +02:00
watchdog [ARM] 5460/1: Orion: reduce namespace pollution 2009-04-23 23:25:41 +01:00
xen [IA64] xen_domu_defconfig: fix build issues/warnings 2009-05-05 11:43:13 -07:00
zorro
Kconfig
Makefile V4L/DVB (11561a): move media after i2c 2009-04-29 15:41:13 -03:00