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Nicholas Piggin 6e7f6b82c6 tty: hvc: hvc_poll() fix read loop hang 
Commit ec97eaad1383 ("tty: hvc: hvc_poll() break hv read loop") causes
the virtio console to hang at times (e.g., if you paste a bunch of
characters to it.

The reason is that get_chars must return 0 before we can be sure the
driver will kick or poll input again, but this change only scheduled a
poll if get_chars had returned a full count. Change this to poll on
any > 0 count.

Reported-by: Matteo Croce <mcroce@redhat.com>
Reported-by: Jason Gunthorpe <jgg@mellanox.com>
Tested-by: Matteo Croce <mcroce@redhat.com>
Tested-by: Jason Gunthorpe <jgg@mellanox.com>
Tested-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-09-10 18:04:31 +02:00
..
accessibility
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acpi
Merge branch 'acpi-bus'
2018-09-07 10:05:20 +02:00
amba
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android
android: binder: Rate-limit debug and userspace triggered err msgs
2018-08-08 11:05:47 +02:00
ata
SCSI fixes on 20180905
2018-09-05 09:17:20 -07:00
atm
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auxdisplay
Char/Misc driver patches for 4.19-rc1
2018-08-18 11:04:51 -07:00
base
memory_hotplug: fix kernel_panic on offline page processing
2018-09-04 16:45:02 -07:00
bcma
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block
Two rbd patches to complete support for images within namespaces that
2018-09-07 10:57:59 -07:00
bluetooth
Bluetooth: mediatek: Fix memory leak
2018-08-21 16:56:20 +02:00
bus
Merge branch 'perm-fix' into omap-for-v4.19/fixes-v2
2018-08-28 09:58:03 -07:00
cdrom
cdrom: Fix info leak/OOB read in cdrom_ioctl_drive_status
2018-08-29 08:09:20 -06:00
char
Fix things so the choice of whether or not to trust RDRAND to
2018-09-09 05:54:05 -07:00
clk
clk: x86: Set default parent to 48Mhz
2018-08-30 14:47:41 -07:00
clocksource
RISC-V Updates for the 4.19 Merge Window
2018-08-19 09:56:38 -07:00
connector
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cpufreq
ARM: SoC driver updates
2018-08-23 13:52:46 -07:00
cpuidle
cpuidle: menu: Retain tick when shallow state is selected
2018-08-25 13:16:08 +02:00
crypto
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
2018-08-29 13:38:39 -07:00
dax
drivers/dax/device.c: convert variable to vm_fault_t type
2018-09-04 16:45:02 -07:00
dca
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devfreq
Char/Misc driver patches for 4.19-rc1
2018-08-18 11:04:51 -07:00
dio
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dma
Merge branch 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax
2018-08-26 11:48:42 -07:00
dma-buf
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edac
EDAC: Add missing MEM_LRDDR4 entry in edac_mem_types[]
2018-08-17 15:13:34 +02:00
eisa
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extcon
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firewire
firewire: use 64-bit time_t based interfaces
2018-08-17 16:20:27 -07:00
firmware
firmware: arm_scmi: fix divide by zero when sustained_perf_level is zero
2018-09-06 09:59:40 -07:00
fmc
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fpga
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fsi
fsi: sbefifo: Bump max command length
2018-08-08 15:44:47 +10:00
gnss
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gpio
gpio: Fix crash due to registration race
2018-08-31 11:30:45 +02:00
gpu
drm/i915/dp_mst: Fix enabling pipe clock for all streams
2018-09-03 21:34:36 -07:00
hid
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
2018-08-20 15:59:01 -07:00
hsi
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hv
Drivers: hv: vmbus: Cleanup synic memory free path
2018-08-02 10:20:59 +02:00
hwmon
ARM: SoC fixes
2018-09-08 15:38:57 -07:00
hwspinlock
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hwtracing
drivers/hwtracing/intel_th/msu.c: change return type to vm_fault_t
2018-08-23 18:48:43 -07:00
i2c
i2c: xiic: Make the start and the byte count write atomic
2018-09-06 20:49:09 +02:00
ide
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide
2018-08-22 07:40:33 -07:00
idle
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iio
treewide: convert ISO_8859-1 text comments to utf-8
2018-08-23 18:48:43 -07:00
infiniband
Second merge window update
2018-08-23 15:34:48 -07:00
input
ARM: 32-bit SoC platform updates
2018-08-23 13:44:43 -07:00
iommu
ARM: SoC: late updates
2018-08-25 14:12:36 -07:00
ipack
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irqchip
irqchip/gic-v3-its: Cap lpi_id_bits to reduce memory footprint
2018-09-06 20:31:59 +02:00
isdn
isdn: Disable IIOCDBGVAR
2018-08-16 12:26:24 -07:00
leds
leds: ns2: Change unsigned to unsigned int
2018-08-06 23:03:12 +02:00
lightnvm
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macintosh
macintosh: therm_windtunnel: drop using attach_adapter
2018-08-24 14:42:42 +02:00
mailbox
mailbox: Add support for i.MX messaging unit
2018-08-15 09:53:07 +05:30
mcb
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md
md-cluster: release RESYNC lock after the last resync message
2018-08-31 17:38:10 -07:00
media
Merge branch 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax
2018-08-26 11:48:42 -07:00
memory
memory: ti-aemif: fix a potential NULL-pointer dereference
2018-09-06 10:04:07 -07:00
memstick
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message
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mfd
Merge branch 'i2c/for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
2018-08-21 17:40:46 -07:00
misc
Merge branch 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax
2018-08-26 11:48:42 -07:00
mmc
mmc: renesas_sdhi_internal_dmac: mask DMAC interrupts
2018-08-23 10:00:49 +02:00
mtd
mtd: rawnand: denali: do not pass zero maxchips to nand_scan()
2018-08-27 20:41:46 +02:00
mux
mux: adgs1408: new driver for Analog Devices ADGS1408/1409 mux
2018-08-02 10:23:02 +02:00
net
net: phy: sfp: Handle unimplemented hwmon limits and alarms
2018-09-04 12:22:41 -07:00
nfc
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ntb
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nubus
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nvdimm
libnvdimm-for-4.19_dax-memory-failure
2018-08-25 18:43:59 -07:00
nvme
nvmet: free workqueue object if module init fails
2018-08-28 08:40:44 +02:00
nvmem
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of
dma-mapping fixes for 4.19-rc2
2018-09-02 20:09:36 -07:00
opp
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oprofile
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parisc
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parport
Char/Misc driver patches for 4.19-rc1
2018-08-18 11:04:51 -07:00
pci
Merge branch 'akpm' (patches from Andrew)
2018-08-22 12:34:08 -07:00
pcmcia
pcmcia: remove long deprecated pcmcia_request_exclusive_irq() function
2018-08-18 12:30:42 -07:00
perf
Char/Misc driver patches for 4.19-rc1
2018-08-18 11:04:51 -07:00
phy
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pinctrl
- New Drivers
2018-08-20 15:38:44 -07:00
platform
platform-drivers-x86 for v4.19-1
2018-08-22 14:14:15 -07:00
pnp
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power
treewide: convert ISO_8859-1 text comments to utf-8
2018-08-23 18:48:43 -07:00
powercap
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pps
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ps3
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ptp
Char/Misc driver patches for 4.19-rc1
2018-08-18 11:04:51 -07:00
pwm
pwm: mediatek: Add MT7628 support
2018-08-20 11:36:07 +02:00
rapidio
drivers/rapidio/devices/rio_mport_cdev.c: remove redundant pointer md
2018-08-22 10:52:51 -07:00
ras
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regulator
- New Drivers
2018-08-20 15:38:44 -07:00
remoteproc
remoteproc/davinci: use the reset framework
2018-08-16 17:39:55 -07:00
reset
ARM: SoC: late updates
2018-08-25 14:12:36 -07:00
rpmsg
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rtc
RTC for 4.19
2018-08-20 16:30:27 -07:00
s390
libnvdimm-for-4.19_misc
2018-08-25 18:13:10 -07:00
sbus
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scsi
scsi: aacraid: fix a signedness bug
2018-08-27 13:17:00 -04:00
sfi
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sh
sh: introduce a sh_cacheop_vaddr helper
2018-08-02 13:54:06 +02:00
siox
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slimbus
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sn
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soc
ARM: Device-tree updates
2018-08-23 14:02:22 -07:00
soundwire
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spi
hwspinlock updates for v4.19
2018-08-18 16:45:27 -07:00
spmi
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ssb
ssb: Remove SSB_WARN_ON, SSB_BUG_ON and SSB_DEBUG
2018-08-09 18:47:47 +03:00
staging
ARM: SoC driver updates
2018-08-23 13:52:46 -07:00
target
scsi: target: iscsi: cxgbit: use pr_debug() instead of pr_info()
2018-08-27 12:26:10 -04:00
tc
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tee
ARM: SoC driver updates
2018-08-23 13:52:46 -07:00
thermal
Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal
2018-08-28 16:11:34 -07:00
thunderbolt
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tty
tty: hvc: hvc_poll() fix read loop hang
2018-09-10 18:04:31 +02:00
uio
Char/Misc fix for 4.19-rc1
2018-08-19 09:30:44 -07:00
usb
ARM: SoC driver updates
2018-08-23 13:52:46 -07:00
uwb
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vfio
powerpc updates for 4.19
2018-08-17 11:32:50 -07:00
vhost
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2018-08-27 11:59:39 -07:00
video
fbdev changes for v4.19:
2018-08-23 15:44:58 -07:00
virt
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virtio
virtio, vhost: fixes, tweaks
2018-08-24 08:45:19 -07:00
visorbus
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vlynq
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vme
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w1
power supply and reset changes for the v4.19 series
2018-08-21 18:06:27 -07:00
watchdog
include/linux/compiler*.h: make compiler-*.h mutually exclusive
2018-08-22 17:31:34 -07:00
xen
xen: fixes for 4.19-rc2
2018-08-31 08:45:16 -07:00
zorro
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Kconfig
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Makefile
Char/Misc driver patches for 4.19-rc1
2018-08-18 11:04:51 -07:00