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Xie He 1fef73597f net: hdlc_ppp: Fix issues when mod_timer is called while timer is running 
ppp_cp_event is called directly or indirectly by ppp_rx with "ppp->lock"
held. It may call mod_timer to add a new timer. However, at the same time
ppp_timer may be already running and waiting for "ppp->lock". In this
case, there's no need for ppp_timer to continue running and it can just
exit.

If we let ppp_timer continue running, it may call add_timer. This causes
kernel panic because add_timer can't be called with a timer pending.
This patch fixes this problem.

Fixes: e022c2f07ae5 ("WAN: new synchronous PPP implementation for generic HDLC.")
Cc: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: Xie He <xie.he.0141@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-12-28 15:09:04 -08:00
..
accessibility
speakup: fix uninitialized flush_lock
2020-12-09 15:38:13 +01:00
acpi
ACPI updates for 5.11-rc1
2020-12-15 16:39:06 -08:00
amba
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android
Merge branch 'exec-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2020-12-15 19:29:43 -08:00
ata
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atm
atm: idt77252: call pci_disable_device() on error path
2020-12-21 17:34:09 -08:00
auxdisplay
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base
Power management updates for 5.11-rc1
2020-12-15 16:30:31 -08:00
bcma
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block
powerpc updates for 5.11
2020-12-17 13:34:25 -08:00
bluetooth
Bluetooth: btusb: Add workaround for remote-wakeup issues with Barrot 8041a02 fake CSR controllers
2020-12-07 17:01:54 +02:00
bus
ARM: SoC drivers for v5.11
2020-12-16 16:38:41 -08:00
cdrom
cdrom: Reset sector_size back it is not 2048.
2020-12-12 11:12:25 -07:00
char
powerpc updates for 5.11
2020-12-17 13:34:25 -08:00
clk
ARM: SoC updates for OMAP GenPD
2020-12-16 16:53:54 -08:00
clocksource
asm-generic: cross-architecture timer cleanup
2020-12-16 00:07:17 -08:00
connector
net/connector: Add const qualifier to cb_id
2020-12-16 11:06:49 -08:00
counter
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cpufreq
Merge branch 'pm-cpufreq'
2020-12-15 15:24:52 +01:00
cpuidle
ARM: SoC drivers for v5.11
2020-12-16 16:38:41 -08:00
crypto
Networking updates for 5.11
2020-12-15 13:22:29 -08:00
dax
vm_ops: rename .split() callback to .may_split()
2020-12-15 12:13:41 -08:00
dca
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devfreq
Merge branches 'pm-devfreq' and 'pm-tools'
2020-12-15 15:27:16 +01:00
dio
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dma
dmaengine updates for v5.11-rc1
2020-12-17 12:52:23 -08:00
dma-buf
Merge branch 'akpm' (patches from Andrew)
2020-12-15 12:53:37 -08:00
edac
Merge branch 'akpm' (patches from Andrew)
2020-12-15 12:53:37 -08:00
eisa
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extcon
extcon: max77693: Fix modalias string
2020-12-11 17:18:10 +09:00
firewire
…
firmware
ARM: SoC drivers for v5.11
2020-12-16 16:38:41 -08:00
fpga
…
fsi
hwmon patches for v5.11
2020-12-15 16:06:14 -08:00
gnss
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gpio
- New Drivers
2020-12-16 14:48:32 -08:00
gpu
drm/edid: fix objtool warning in drm_cvt_modes()
2020-12-17 09:27:57 -08:00
greybus
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hid
Merge branch 'for-5.11/wacom' into for-linus
2020-12-16 11:44:38 +01:00
hsi
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hv
hyperv-next for 5.11
2020-12-16 11:49:46 -08:00
hwmon
ARM: SoC drivers for v5.11
2020-12-16 16:38:41 -08:00
hwspinlock
hwspinlock: sirf: Remove the redundant 'of_match_ptr'
2020-12-10 13:34:40 -06:00
hwtracing
Char / Misc driver updates for 5.11-rc1
2020-12-15 14:10:09 -08:00
i2c
Power management updates for 5.11-rc1
2020-12-15 16:30:31 -08:00
i3c
…
ide
for-5.11/block-2020-12-14
2020-12-16 12:57:51 -08:00
idle
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iio
Staging / IIO driver patches for 5.11-rc1
2020-12-15 14:18:40 -08:00
infiniband
RDMA 5.11 pull request
2020-12-16 13:42:26 -08:00
input
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2020-12-15 16:18:23 -08:00
interconnect
ARM: device tree updates for 5.11
2020-12-16 16:27:35 -08:00
iommu
IOMMU updates for 5.11
2020-12-16 13:58:47 -08:00
ipack
…
irqchip
irqchip/qcom-pdc: Fix phantom irq when changing between rising/falling
2020-12-12 10:46:02 +00:00
isdn
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leds
…
lightnvm
drivers/lightnvm: fix a null-ptr-deref bug in pblk-core.c
2020-12-08 10:02:45 -07:00
macintosh
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mailbox
mailbox: arm_mhuv2: Add driver
2020-12-09 19:26:02 -06:00
mcb
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md
for-5.11/drivers-2020-12-14
2020-12-16 13:09:32 -08:00
media
ARM: SoC drivers for v5.11
2020-12-16 16:38:41 -08:00
memory
Merge tag 'memory-controller-drv-tegra-5.11-3' of git://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux-mem-ctrl into arm/drivers
2020-12-09 00:40:02 +01:00
memstick
…
message
SCSI misc on 20201216
2020-12-16 13:34:31 -08:00
mfd
…
misc
powerpc updates for 5.11
2020-12-17 13:34:25 -08:00
mmc
MMC core:
2020-12-15 15:57:25 -08:00
most
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mtd
MTD core:
2020-12-16 14:58:35 -08:00
mux
…
net
net: hdlc_ppp: Fix issues when mod_timer is called while timer is running
2020-12-28 15:09:04 -08:00
nfc
nfc: s3fwrn5: Remove unused NCI prop commands
2020-12-16 13:09:35 -08:00
ntb
…
nubus
…
nvdimm
…
nvme
RDMA 5.11 pull request
2020-12-16 13:42:26 -08:00
nvmem
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of
Driver core updates for 5.11-rc1
2020-12-15 14:02:26 -08:00
opp
Merge branch 'pm-cpufreq'
2020-12-15 15:24:52 +01:00
oprofile
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parisc
…
parport
…
pci
RDMA 5.11 pull request
2020-12-16 13:42:26 -08:00
pcmcia
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perf
perf/imx_ddr: Add system PMU identifier for userspace
2020-12-09 14:14:02 +00:00
phy
Char / Misc driver updates for 5.11-rc1
2020-12-15 14:10:09 -08:00
pinctrl
This is the bulk of pin control changes for the v5.11 kernel:
2020-12-16 15:02:49 -08:00
platform
Merge tag 'thermal-v5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux
2020-12-15 16:21:37 -08:00
pnp
…
power
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powercap
Merge branches 'pm-sleep', 'pm-acpi', 'pm-domains' and 'powercap'
2020-12-15 15:26:14 +01:00
pps
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ps3
powerpc/ps3: use dma_mapping_error()
2020-12-15 22:50:12 +11:00
ptp
ptp: clockmatrix: deprecate firmware older than 4.8.7
2020-12-09 15:00:55 -08:00
pwm
…
rapidio
rapidio: remove unused rio_get_asm() and rio_get_device()
2020-12-15 22:46:18 -08:00
ras
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regulator
Merge remote-tracking branch 'regulator/for-5.11' into regulator-next
2020-12-11 17:48:32 +00:00
remoteproc
ARM: SoC drivers for v5.11
2020-12-16 16:38:41 -08:00
reset
ARM: SoC drivers for v5.11
2020-12-16 16:38:41 -08:00
rpmsg
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rtc
ntp: Make the RTC sync offset less obscure
2020-12-11 10:40:53 +01:00
s390
VFIO updates for v5.11-rc1
2020-12-16 15:51:15 -08:00
sbus
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scsi
powerpc updates for 5.11
2020-12-17 13:34:25 -08:00
sfi
…
sh
…
siox
siox: Make remove callback return void
2020-12-10 16:17:15 +01:00
slimbus
slimbus: qcom: fix potential NULL dereference in qcom_slim_prg_slew()
2020-12-10 16:23:56 +01:00
soc
OpenRISC updates for 5.11
2020-12-17 13:41:27 -08:00
soundwire
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spi
Merge remote-tracking branch 'spi/for-5.11' into spi-next
2020-12-11 17:49:01 +00:00
spmi
spmi: Add driver shutdown support
2020-12-10 10:45:36 +01:00
ssb
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staging
ARM: SoC drivers for v5.11
2020-12-16 16:38:41 -08:00
target
SCSI misc on 20201216
2020-12-16 13:34:31 -08:00
tc
…
tee
ARM: SoC drivers for v5.11
2020-12-16 16:38:41 -08:00
thermal
Merge tag 'thermal-v5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux
2020-12-15 16:21:37 -08:00
thunderbolt
thunderbolt: Changes for v5.11 merge window
2020-12-08 13:41:45 +01:00
tty
OpenRISC updates for 5.11
2020-12-17 13:41:27 -08:00
uio
uio: uio_hv_generic: use devm_kzalloc() for private data alloc
2020-12-09 19:59:00 +01:00
usb
powerpc updates for 5.11
2020-12-17 13:34:25 -08:00
vdpa
Merge branch 'mlx5-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux
2020-12-07 18:36:21 -08:00
vfio
VFIO updates for v5.11-rc1
2020-12-16 15:51:15 -08:00
vhost
vhost: vringh: use krealloc_array()
2020-12-15 12:13:37 -08:00
video
powerpc updates for 5.11
2020-12-17 13:34:25 -08:00
virt
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virtio
mm, page_poison: remove CONFIG_PAGE_POISONING_NO_SANITY
2020-12-15 12:13:46 -08:00
visorbus
…
vlynq
…
vme
vme: switch from 'pci_' to 'dma_' API
2020-12-09 19:44:34 +01:00
w1
…
watchdog
…
xen
xen: branch for v5.11-rc1
2020-12-16 11:53:09 -08:00
zorro
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Kconfig
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Makefile
asm-generic: cross-architecture timer cleanup
2020-12-16 00:07:17 -08:00