Tetsuo Handa c8e50ece3d driver core: Fix probe_count imbalance in really_probe() ...

commit b292b50b0efcc7095d8bf15505fba6909bb35dce upstream.

syzbot is reporting hung task in wait_for_device_probe() [1]. At least,
we always need to decrement probe_count if we incremented probe_count in
really_probe().

However, since I can't find "Resources present before probing" message in
the console log, both "this message simply flowed off" and "syzbot is not
hitting this path" will be possible. Therefore, while we are at it, let's
also prepare for concurrent wait_for_device_probe() calls by replacing
wake_up() with wake_up_all().

[1] https://syzkaller.appspot.com/bug?id=25c833f1983c9c1d512f4ff860dd0d7f5a2e2c0f

Reported-by: syzbot <syzbot+805f5f6ae37411f15b64@syzkaller.appspotmail.com>
Fixes: 7c35e699c88bd607 ("driver core: Print device when resources present in really_probe()")
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: stable <stable@kernel.org>
Link: https://lore.kernel.org/r/20200713021254.3444-1-penguin-kernel@I-love.SAKURA.ne.jp
[iwamatsu: Drop patch for deferred_probe_timeout_work_func()]
Signed-off-by: Nobuhiro Iwamatsu (CIP) <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2020-10-14 09:46:22 +02:00

..

power

PM: sleep: core: Fix the handling of pending runtime resume requests

2020-09-03 11:19:27 +02:00

regmap

regmap: debugfs: check count when read regmap file

2020-07-31 16:43:16 +02:00

attribute_container.c

attribute_container: fix missing blank lines after declarations

2015-03-25 14:35:09 +01:00

base.h

driver core: correct device's shutdown order

2015-08-05 17:07:19 -07:00

bus.c

sysfs: Disable lockdep for driver bind/unbind files

2019-01-26 09:42:54 +01:00

cacheinfo.c

drivers: base: cacheinfo: fix boot error message when acpi is enabled

2018-01-31 12:06:08 +01:00

class.c

class_find_device: fix reference to argument "match"

2015-09-29 15:23:14 +02:00

component.c

component: fix bug with legacy API

2014-07-04 18:05:05 +01:00

container.c

ACPI / hotplug / driver core: Handle containers in a special way

2013-12-29 15:25:48 +01:00

core.c

device property: Fix the secondary firmware node handling in set_primary_fwnode()

2020-09-03 11:19:27 +02:00

cpu.c

x86/speculation: Add Special Register Buffer Data Sampling (SRBDS) mitigation

2020-06-11 09:21:40 +02:00

dd.c

driver core: Fix probe_count imbalance in really_probe()

2020-10-14 09:46:22 +02:00

devcoredump.c

devcoredump: provide a one-way disable function

2014-11-26 19:40:12 -08:00

devres.c

devm: make allocations numa aware by default

2015-10-09 17:00:33 -04:00

devtmpfs.c

VFS: assorted weird filesystems: d_inode() annotations

2015-04-15 15:06:58 -04:00

dma-coherent.c

drivers: dma-coherent: add initialization from device tree

2014-10-14 02:18:12 +02:00

dma-contiguous.c

Merge tag 'driver-core-4.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

2015-11-04 21:50:37 -08:00

dma-mapping.c

drivers: base: dma-mapping: page align the size when unmap_kernel_range

2016-10-22 12:26:55 +02:00

driver.c

driver core: add missing blank line after declaration

2015-03-25 14:36:30 +01:00

firmware_class.c

firmware: actually return NULL on failed request_firmware_nowait()

2020-05-10 10:25:54 +02:00

firmware.c

…

hypervisor.c

…

init.c

drivers: of/base: move of_init to driver_init

2015-05-26 19:55:56 -07:00

isa.c

isa: Call isa_bus_init before dependent ISA bus drivers register

2020-05-10 10:26:03 +02:00

Kconfig

sysfs/cpu: Add vulnerability folder

2018-01-17 09:35:33 +01:00

Makefile

drivers/base: Add MSI domain support for non-PCI devices

2015-07-30 00:14:38 +02:00

map.c

drivers: base: map: Use kmalloc_array instead of kmalloc

2015-03-25 14:35:08 +01:00

memory.c

base/memory, hotplug: fix a kernel oops in show_valid_zones()

2017-02-09 08:02:47 +01:00

module.c

base: make module_create_drivers_dir race-free

2016-07-27 09:47:32 -07:00

node.c

Revert "mm: Check if section present during memory block (un)registering"

2015-10-13 10:57:25 -07:00

pinctrl.c

drivers/pinctrl: Add the concept of an "init" state

2015-10-27 11:24:23 +01:00

platform-msi.c

irqdomain/msi: Use fwnode instead of of_node

2015-10-13 19:01:25 +02:00

platform.c

drivers: base: Fix NULL pointer exception in __platform_driver_probe() if a driver developer is foolish

2020-06-29 20:07:51 -04:00

property.c

device property: ACPI: Remove unused DMA APIs

2015-11-07 01:29:22 +01:00

soc.c

base: soc: Export soc_device_register/unregister APIs

2019-10-05 12:27:46 +02:00

syscore.c

genirq: Simplify wakeup mechanism

2014-09-01 13:48:59 +02:00

topology.c

sched/topology: Rename topology_thread_cpumask() to topology_sibling_cpumask()

2015-05-27 15:22:15 +02:00

transport_class.c

…