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Leo Yan 0e4f7f920a tty: serial: msm_serial: Fix lockup for sysrq and oops 
As the commit 677fe555cb ("serial: imx: Fix recursive locking bug")
has mentioned the uart driver might cause recursive locking between
normal printing and the kernel debugging facilities (e.g. sysrq and
oops).  In the commit it gave out suggestion for fixing recursive
locking issue: "The solution is to avoid locking in the sysrq case
and trylock in the oops_in_progress case."

This patch follows the suggestion (also used the exactly same code with
other serial drivers, e.g. amba-pl011.c) to fix the recursive locking
issue, this can avoid stuck caused by deadlock and print out log for
sysrq and oops.

Fixes: 04896a77a9 ("msm_serial: serial driver for MSM7K onboard serial peripheral.")
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Link: https://lore.kernel.org/r/20191127141544.4277-2-leo.yan@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2019-12-12 14:26:59 +01:00
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accessibility
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acpi Additional ACPI updates for 5.5-rc1 2019-12-04 10:56:35 -08:00
amba
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android compat_ioctl: remove most of fs/compat_ioctl.c 2019-12-01 13:46:15 -08:00
ata pci-v5.5-changes 2019-12-03 13:58:22 -08:00
atm
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auxdisplay auxdisplay: charlcd: deduplicate simple_strtoul() 2019-12-04 19:44:12 -08:00
base ARM: SoC-related driver updates 2019-12-05 11:43:31 -08:00
bcma
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block xen: branch for v5.5-rc1 2019-12-07 14:49:20 -08:00
bluetooth
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bus Few ti-sysc related fixes for v5.5 merge window 2019-12-06 08:26:50 -08:00
cdrom
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char drm msm + fixes for 5.5-rc1 2019-12-06 10:28:09 -08:00
clk ARM: SoC platform updates 2019-12-05 11:38:40 -08:00
clocksource Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-12-03 12:20:25 -08:00
connector
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counter
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cpufreq cpufreq: tegra: Changes for v5.5-rc1 2019-12-06 08:28:13 -08:00
cpuidle cpuidle: minor Kconfig help text fixes 2019-11-29 11:49:32 +01:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2019-12-02 17:23:21 -08:00
dax libnvdimm for 5.5 2019-12-01 18:43:25 -08:00
dca
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devfreq PM / devfreq: Add missing locking while setting suspend_freq 2019-11-29 12:50:34 +01:00
dio
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dma
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dma-buf compat_ioctl: remove most of fs/compat_ioctl.c 2019-12-01 13:46:15 -08:00
edac
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eisa
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extcon
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firewire FireWire (IEEE 1394) subsystem updates: 2019-12-02 14:13:00 -08:00
firmware ARM: SoC fixes 2019-12-06 14:19:37 -08:00
fpga
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fsi
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gnss
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gpio gpio: pca953x: tighten up indentation 2019-12-04 19:44:14 -08:00
gpu drm msm + fixes for 5.5-rc1 2019-12-06 10:28:09 -08:00
greybus
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hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid 2019-12-01 18:20:54 -08:00
hsi
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hv Merge branch 'akpm' (patches from Andrew) 2019-12-01 20:36:41 -08:00
hwmon compat_ioctl: remove most of fs/compat_ioctl.c 2019-12-01 13:46:15 -08:00
hwspinlock
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hwtracing compat_ioctl: remove most of fs/compat_ioctl.c 2019-12-01 13:46:15 -08:00
i2c Merge branch 'i2c/for-5.5' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2019-12-01 18:29:36 -08:00
i3c
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ide compat_ioctl: remove most of fs/compat_ioctl.c 2019-12-01 13:46:15 -08:00
idle cpuidle: Drop disabled field from struct cpuidle_state 2019-11-29 11:48:39 +01:00
iio chrome platform changes for v5.5 2019-12-03 14:37:12 -08:00
infiniband net: ipv6_stub: use ip6_dst_lookup_flow instead of ip6_dst_lookup 2019-12-04 12:27:13 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2019-12-07 18:33:01 -08:00
interconnect
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iommu pci-v5.5-changes 2019-12-03 13:58:22 -08:00
ipack
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irqchip pci-v5.5-changes 2019-12-03 13:58:22 -08:00
isdn compat_ioctl: remove most of fs/compat_ioctl.c 2019-12-01 13:46:15 -08:00
leds Merge tag 'leds-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/pavel/linux-leds 2019-12-01 16:09:28 -08:00
lightnvm
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macintosh powerpc updates for 5.5 2019-11-30 14:35:43 -08:00
mailbox mailbox changes for v5.5 2019-12-01 18:42:02 -08:00
mcb
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md block: don't handle bio based drivers in blk_revalidate_disk_zones 2019-12-03 08:51:25 -07:00
media compat_ioctl: remove most of fs/compat_ioctl.c 2019-12-01 13:46:15 -08:00
memory memory: tegra: Fixes for v5.5-rc1 2019-12-06 08:28:51 -08:00
memstick pci-v5.5-changes 2019-12-03 13:58:22 -08:00
message
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mfd chrome platform changes for v5.5 2019-12-03 14:37:12 -08:00
misc lib/genalloc.c: rename addr_in_gen_pool to gen_pool_has_addr 2019-12-04 19:44:13 -08:00
mmc
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mtd TTY/Serial patches for 5.5-rc1 2019-12-03 14:09:14 -08:00
mux
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net Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-12-08 13:28:11 -08:00
nfc
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ntb Add Hygon Device ID to the AMD NTB device driver 2019-12-07 18:38:17 -08:00
nubus
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nvdimm libnvdimm for 5.5 2019-12-01 18:43:25 -08:00
nvme pci-v5.5-changes 2019-12-03 13:58:22 -08:00
nvmem ARM: SoC-related driver updates 2019-12-05 11:43:31 -08:00
of Devicetree updates for v5.5: 2019-12-02 11:41:35 -08:00
opp
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oprofile
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parisc
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parport
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pci pci-v5.5-changes 2019-12-03 13:58:22 -08:00
pcmcia
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perf
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phy ARM: SoC-related driver updates 2019-12-05 11:43:31 -08:00
pinctrl Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-12-03 09:29:50 -08:00
platform chrome platform changes for v5.5 2019-12-03 14:37:12 -08:00
pnp
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power Additional power management updates for 5.5-rc1 2019-12-04 10:48:09 -08:00
powercap
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pps
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ps3
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ptp
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pwm pwm: Changes for v5.5-rc1 2019-12-05 11:28:14 -08:00
rapidio drivers/rapidio/rio-access.c: fix missing include of <linux/rio_drv.h> 2019-12-04 19:44:13 -08:00
ras
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regulator
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remoteproc
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reset ARM: SoC-related driver updates 2019-12-05 11:43:31 -08:00
rpmsg rpmsg updates for v5.5 2019-12-01 18:39:24 -08:00
rtc RTC for 5.5 2019-12-03 13:31:08 -08:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-12-08 13:28:11 -08:00
sbus
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scsi SCSI misc on 20191207 2019-12-08 12:23:42 -08:00
sfi
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sh
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siox
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slimbus
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soc ARM: SoC fixes 2019-12-06 14:19:37 -08:00
soundwire
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spi
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spmi
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ssb
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staging pci-v5.5-changes 2019-12-03 13:58:22 -08:00
target SCSI misc on 20191130 2019-12-02 13:37:02 -08:00
tc
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tee Merge mainline/master into arm/fixes 2019-12-05 13:18:54 -08:00
thermal Merge branch 'thermal/next' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux 2019-12-05 11:21:24 -08:00
thunderbolt
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tty tty: serial: msm_serial: Fix lockup for sysrq and oops 2019-12-12 14:26:59 +01:00
uio
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usb usb, kcov: collect coverage from hub_event 2019-12-04 19:44:14 -08:00
vfio VFIO updates for v5.5-rc1 2019-12-07 14:51:04 -08:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-12-08 13:28:11 -08:00
video pci-v5.5-changes 2019-12-03 13:58:22 -08:00
virt compat_ioctl: remove most of fs/compat_ioctl.c 2019-12-01 13:46:15 -08:00
virtio
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visorbus
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vlynq
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vme
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w1
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watchdog linux-watchdog 5.5-rc1 tag 2019-12-01 18:01:03 -08:00
xen xen: branch for v5.5-rc1 2019-12-07 14:49:20 -08:00
zorro
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Kconfig
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Makefile
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