AcoSail/kernel_optimize_test
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kernel_optimize_test/drivers
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Linus Torvalds 202c4675c5 pty_write: don't do a tty_wakeup() when the buffers are full 
Commit ac89a9174 ("pty: don't limit the writes to 'pty_space()' inside
'pty_write()'") removed the pty_space() checking, in order to let the
regular tty buffer code limit the buffering itself.

That was all good, but as a subtle side effect it meant that we'd be
doing a tty_wakeup() even in the case where the buffers were all filled
up, and didn't actually make any progress on the write.

Which sounds innocuous, but it interacts very badly with the ppp_async
code, which has an infinite loop in ppp_async_push() that tries to push
out data to the tty.  When we call tty_wakeup(), that loop ends up
thinking that progress was made (see the subtle interactions between
XMIT_WAKEUP and 'tty_stuffed' for details).  End result: one unhappy ppp
user.

Fixed by noticing when tty_insert_flip_string() didn't actually do
anything, and then not doing any more processing (including, very much
not calling tty_wakeup()).

Bisected-and-tested-by: Peter Volkov <pva@gentoo.org>
Cc: stable@kernel.org (2.6.31)
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-18 07:05:58 -07:00
..
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acpi Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2009-09-16 07:49:54 -07:00
amba Merge branches 'arm', 'at91', 'bcmring', 'ep93xx', 'mach-types', 'misc' and 'w90x900' into devel 2009-09-12 12:01:34 +01:00
ata libata: Add pata_atp867x driver for Artop/Acard ATP867X controllers 2009-09-17 16:47:06 -04:00
atm drivers/atm: Use DIV_ROUND_CLOSEST 2009-08-02 12:54:22 -07:00
auxdisplay
base Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev 2009-09-15 09:50:49 -07:00
block Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2009-09-16 08:27:10 -07:00
bluetooth pcmcia: dtl1_cs: fix pcmcia_loop_config logic 2009-09-15 10:17:16 -07:00
cdrom
char pty_write: don't do a tty_wakeup() when the buffers are full 2009-09-18 07:05:58 -07:00
clocksource sh: CMT suspend/resume 2009-08-15 12:58:45 +09:00
connector
cpufreq Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2009-09-15 09:39:44 -07:00
cpuidle
crypto crypto: talitos - add support for 36 bit addressing 2009-08-13 11:51:51 +10:00
dca
dio
dma at_hdmac: Rework suspend_late()/resume_early() 2009-09-14 20:27:00 +02:00
edac amd64_edac: check NB MCE bank enable on the current node properly 2009-09-16 13:05:46 +02:00
eisa
firewire driver model: constify attribute groups 2009-09-15 09:50:47 -07:00
firmware driver model: constify attribute groups 2009-09-15 09:50:47 -07:00
gpio
gpu PCI/vgaarb: cleanup some warnings + cleanup some comments. 2009-09-09 13:29:41 -07:00
hid Merge branches 'upstream', 'upstream-fixes' and 'debugfs' into for-linus 2009-09-13 20:09:41 +02:00
hwmon hwmon: (lm85) Don't bind to Winbond/Nuvoton WPCD377I 2009-09-15 17:18:14 +02:00
i2c Merge branch 'master' into for-linus 2009-08-23 00:03:00 +02:00
ide Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-next-2.6 2009-09-15 10:01:16 -07:00
idle
ieee1394 drivers: Kill now superfluous ->last_rx stores 2009-09-02 23:07:36 -07:00
ieee802154 netdev: convert bulk of drivers to netdev_tx_t 2009-09-01 01:14:07 -07:00
infiniband driver model: constify attribute groups 2009-09-15 09:50:47 -07:00
input Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2009-09-16 08:27:10 -07:00
isdn isdn: convert to netdev_tx_t 2009-09-01 01:13:16 -07:00
leds leds: after setting inverted attribute, we must update the LED 2009-08-26 20:06:53 -07:00
lguest lguest and virtio: cleanup struct definitions to Linux style. 2009-07-30 16:03:46 +09:30
macintosh Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2009-09-15 09:51:09 -07:00
mca
md Merge branch 'for-2.6.32' of git://git.kernel.dk/linux-2.6-block 2009-09-14 17:55:15 -07:00
media Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6 2009-09-15 09:22:18 -07:00
memstick
message Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2009-09-14 17:53:36 -07:00
mfd mfd: twl4030 irq fixes 2009-08-04 20:31:32 +02:00
misc hpilo: add poll f_op 2009-09-15 09:50:48 -07:00
mmc driver model: constify attribute groups 2009-09-15 09:50:47 -07:00
mtd Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2009-09-16 08:27:10 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-09-17 20:53:52 -07:00
nubus
of
oprofile
parisc parisc: hppb.c - fix printk format strings 2009-08-02 15:42:39 +02:00
parport
pci Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2009-09-16 07:49:54 -07:00
pcmcia Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/pcmcia-2.6 2009-09-16 08:11:23 -07:00
platform hp-wmi: Switch driver to dev_pm_ops 2009-09-14 20:26:59 +02:00
pnp x86: Introduce GDT_ENTRY_INIT(), initialize bad_bios_desc statically 2009-08-10 11:10:52 +02:00
power Merge git://git.infradead.org/users/cbou/battery-2.6.31 2009-07-30 16:45:53 -07:00
pps pps: fix incorrect verdict check 2009-08-26 20:06:52 -07:00
ps3 powerpc/ps3: Workaround for flash memory I/O error 2009-09-11 11:28:00 +10:00
rapidio
regulator
rtc Nicolas Pitre has a new email address 2009-09-15 09:37:12 -07:00
s390 driver model: constify attribute groups 2009-09-15 09:50:47 -07:00
sbus
scsi driver model: constify attribute groups 2009-09-15 09:50:47 -07:00
serial Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-09-17 20:53:52 -07:00
sh
sn
spi Merge branch 'master' into devel 2009-09-12 12:04:37 +01:00
ssb ssb/sdio: fix printk format warnings 2009-09-16 16:21:00 -04:00
staging MIPS: Octeon: False positive timeout 2009-09-17 20:07:41 +02:00
tc
telephony
thermal thermal_sys: check get_temp return value 2009-08-26 20:06:52 -07:00
uio uio: add generic driver for PCI 2.3 devices 2009-09-15 09:50:48 -07:00
usb debugfs: Modified default dir of debugfs for debugging UHCI. 2009-09-15 09:50:49 -07:00
uwb Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/dvrabel/uwb 2009-09-17 09:44:09 -07:00
video Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6 2009-09-17 20:54:12 -07:00
virtio virtio: refactor find_vqs 2009-07-30 16:03:45 +09:30
vlynq
w1 Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2009-08-12 17:44:53 -07:00
watchdog [WATCHDOG] ar7_wdt: fix path to ar7-specific headers 2009-08-15 13:05:01 +00:00
xen Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2009-09-15 09:39:44 -07:00
zorro
Kconfig
Makefile