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OpenCloudOS-Kernel
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Erwan Le Ray ad76768124 serial: stm32: fix a deadlock condition with wakeup event 
Deadlock issue is seen when enabling CONFIG_PROVE_LOCKING=Y, and uart
console as wakeup source. Deadlock occurs when resuming from low power
mode if system is waked up via usart console.
The deadlock is triggered 100% when also disabling console suspend prior
to go to suspend.

Simplified call stack, deadlock condition:
- stm32_console_write <-- spin_lock already held
- print_circular_bug
- pm_wakeup_dev_event <-- triggers lockdep as seen above
- stm32_receive_chars
- stm32_interrupt <-- wakeup via uart console, takes the lock

So, revisit spin_lock in stm32-usart driver:
- there is no need to hold the lock to access ICR (atomic clear of status
  flags)
- only hold the lock inside stm32_receive_chars() routine (no need to
  call pm_wakeup_dev_event with lock held)
- keep stm32_transmit_chars() routine called with lock held

Fixes: 48a6092fb4 ("serial: stm32-usart: Add STM32 USART Driver")
Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20210304162308.8984-6-erwan.leray@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2021-03-10 09:34:10 +01:00
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accessibility tty: remove TTY_LDISC_MAGIC 2021-03-10 09:34:06 +01:00
acpi Additional ACPI updates for v5.12-rc1 2021-02-25 12:03:13 -08:00
amba
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android
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ata
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atm atm: idt77252: fix build broken on amd64 2021-02-15 12:36:27 -08:00
auxdisplay treewide: Miguel has moved 2021-02-26 09:41:03 -08:00
base PM: runtime: Update device status before letting suppliers suspend 2021-03-01 17:40:38 +01:00
bcma
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block rsxx: Return -EFAULT if copy_to_user() fails 2021-03-03 06:48:44 -07:00
bluetooth tty: remove TTY_LDISC_MAGIC 2021-03-10 09:34:06 +01:00
bus Char/Misc driver patches for 5.12-rc1 2021-02-24 10:25:37 -08:00
cdrom
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char tpmdd updates for Linux v5.12-rc2 2021-03-04 12:51:57 -08:00
clk RISC-V Patches for the 5.12 Merge Window 2021-02-26 10:28:35 -08:00
clocksource A small set of clockevent fixes which fell through the cracks 2021-02-22 14:11:36 -08:00
connector
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counter
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cpufreq Simple Firmware Interface (SFI) support removal for v5.12-rc1 2021-02-24 10:35:29 -08:00
cpuidle
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crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2021-02-21 17:23:56 -08:00
cxl cxl/mem: Fix potential memory leak 2021-02-22 14:44:39 -08:00
dax Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2021-02-27 08:07:12 -08:00
dca
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devfreq Merge branches 'pm-devfreq' and 'pm-tools' 2021-02-15 17:02:04 +01:00
dio
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dma dmaengine updates for v5.12-rc1 2021-02-23 15:05:10 -08:00
dma-buf dma-fence: allow signaling drivers to set fence timestamp 2021-02-24 21:05:28 +05:30
edac Merge branch 'edac-misc' into edac-updates-for-v5.12 2021-02-15 10:06:58 +01:00
eisa
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extcon
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firewire
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firmware Char/Misc driver patches for 5.12-rc1 2021-02-24 10:25:37 -08:00
fpga
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fsi
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gnss
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gpio Driver core / debugfs update for 5.12-rc1 2021-02-24 10:13:55 -08:00
gpu Merge tag 'amd-drm-fixes-5.12-2021-03-03' of https://gitlab.freedesktop.org/agd5f/linux into drm-fixes 2021-03-05 11:13:22 +10:00
greybus
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hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid 2021-02-23 14:52:22 -08:00
hsi
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hv mm/memory_hotplug: MEMHP_MERGE_RESOURCE -> MHP_MERGE_RESOURCE 2021-02-26 09:41:00 -08:00
hwmon Devicetree updates for v5.12: 2021-02-22 10:05:12 -08:00
hwspinlock
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hwtracing ARM updates for 5.12-rc1: 2021-02-22 14:27:07 -08:00
i2c i2c: exynos5: Preserve high speed master code 2021-02-26 11:47:42 +01:00
i3c I3C for 5.12 2021-02-22 09:52:55 -08:00
ide ide-5.11-2021-02-28 2021-02-28 15:48:25 -08:00
idle
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iio - Use the newly introduced 'hot' and 'critical' ops for the acpi 2021-02-22 09:39:11 -08:00
infiniband RDMA/rxe: Fix errant WARN_ONCE in rxe_completer() 2021-03-05 14:15:22 -04:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2021-02-23 14:56:23 -08:00
interconnect
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iommu IOMMU Fixes for Linux v5.12-rc1 2021-03-05 12:26:24 -08:00
ipack
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irqchip irqchip updates for Linux 5.12: 2021-02-15 15:41:56 +01:00
isdn
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leds Updates for 5.12-rc1. Besides usual fixes and new drivers, we are 2021-02-26 13:56:40 -08:00
lightnvm lightnvm: pblk: Replace guid_copy() with export_guid()/import_guid() 2021-02-14 21:27:24 -07:00
macintosh
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mailbox mailbox: arm_mhuv2: Skip calling kfree() with invalid pointer 2021-02-22 13:34:27 -06:00
mcb
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md Fix DM verity target's optional Forward Error Correction (FEC) for 2021-03-05 13:25:23 -08:00
media Fixes around VM_FPNMAP and follow_pfn 2021-02-22 17:45:02 -08:00
memory Char/Misc driver patches for 5.12-rc1 2021-02-24 10:25:37 -08:00
memstick
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message
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mfd Simple Firmware Interface (SFI) support removal for v5.12-rc1 2021-02-24 10:35:29 -08:00
misc tty: remove TTY_LDISC_MAGIC 2021-03-10 09:34:06 +01:00
mmc Merge branch 'stable/for-linus-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb 2021-02-26 13:59:32 -08:00
most
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mtd This pull request contains changes (actually just fixes) for UBIFS 2021-02-21 13:57:08 -08:00
mux
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net net: caif: inline register_ldisc 2021-03-10 09:34:07 +01:00
nfc Char/Misc driver patches for 5.12-rc1 2021-02-24 10:25:37 -08:00
ntb NTB: Add support for EPF PCI Non-Transparent Bridge 2021-02-23 14:12:53 -06:00
nubus
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nvdimm libnvdimm + device-dax for 5.12 2021-02-24 09:35:54 -08:00
nvme nvmet: model_number must be immutable once set 2021-03-05 13:41:03 +01:00
nvmem
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of Char/Misc driver patches for 5.12-rc1 2021-02-24 10:25:37 -08:00
opp opp: Don't skip freq update for different frequency 2021-02-18 12:31:08 +05:30
parisc
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parport
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pci pci-v5.12-changes 2021-02-25 09:56:08 -08:00
pcmcia Merge branch 'pcmcia-next' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux 2021-02-26 13:54:43 -08:00
perf IOMMU Updates for Linux v5.12 2021-02-22 10:31:29 -08:00
phy
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pinctrl RISC-V Patches for the 5.12 Merge Window 2021-02-26 10:28:35 -08:00
platform Additional ACPI updates for v5.12-rc1 2021-02-25 12:03:13 -08:00
pnp
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power
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powercap powercap/drivers/dtpm: Add the experimental label to the option description 2021-03-01 17:43:29 +01:00
pps tty: remove TTY_LDISC_MAGIC 2021-03-10 09:34:06 +01:00
ps3
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ptp ptp: ptp_clockmatrix: clean-up - parenthesis around a == b are unnecessary 2021-02-17 13:49:26 -08:00
pwm pwm: Changes for v5.12-rc1 2021-02-25 12:23:49 -08:00
rapidio
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ras
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regulator - Core Frameworks 2021-02-22 09:29:42 -08:00
remoteproc remoteproc: qcom: pas: Add SM8350 PAS remoteprocs 2021-02-11 12:52:18 -06:00
reset RISC-V Patches for the 5.12 Merge Window 2021-02-26 10:28:35 -08:00
rpmsg
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rtc Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2021-02-27 08:07:12 -08:00
s390 tty: con3215, remove tty->driver_data casts 2021-03-10 09:34:07 +01:00
sbus
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scsi scsi: iscsi: Verify lengths on passthrough PDUs 2021-03-04 20:09:51 -05:00
sh
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siox
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slimbus
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soc OpenRISC updates for 5.12 2021-02-26 14:16:06 -08:00
soundwire ALSA: hda: move Intel SoundWire ACPI scan to dedicated module 2021-03-02 15:33:00 +01:00
spi powerpc updates for 5.12 2021-02-22 14:34:00 -08:00
spmi spmi: spmi-pmic-arb: Fix hw_irq overflow 2021-02-12 12:26:46 +01:00
ssb
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staging tty: make everyone's write_room return >= 0 2021-03-10 09:34:09 +01:00
target SCSI misc on 20210228 2021-02-28 11:51:20 -08:00
tc
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tee
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thermal - Use the newly introduced 'hot' and 'critical' ops for the acpi 2021-02-22 09:39:11 -08:00
thunderbolt
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tty serial: stm32: fix a deadlock condition with wakeup event 2021-03-10 09:34:10 +01:00
uio
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usb tty: make everyone's write_room return >= 0 2021-03-10 09:34:09 +01:00
vdpa vdpa/mlx5: fix param validation in mlx5_vdpa_get_config() 2021-02-23 07:52:59 -05:00
vfio VFIO updates for v5.12-rc1 2021-02-24 10:43:40 -08:00
vhost virtio: features, fixes 2021-02-25 12:21:08 -08:00
video vgacon: comment on vga_rolled_over 2021-03-10 09:34:06 +01:00
virt
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virtio Merge branch 'akpm' (patches from Andrew) 2021-02-26 09:50:09 -08:00
visorbus
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vlynq
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vme
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w1
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watchdog Char/Misc driver patches for 5.12-rc1 2021-02-24 10:25:37 -08:00
xen xen: branch for v5.12-rc1 2021-02-26 10:04:45 -08:00
zorro
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Kconfig cxl/mem: Introduce a driver for CXL-2.0-Type-3 endpoints 2021-02-16 20:36:38 -08:00
Makefile Simple Firmware Interface (SFI) support removal for v5.12-rc1 2021-02-24 10:35:29 -08:00