kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-10-01 18:21:29 +00:00
Code Issues Releases Packages Activity
linux/drivers/base/power
History
Rafael J. Wysocki e1c9d32c98 PM: sleep: Fix possible deadlocks in core system-wide PM code 
[ Upstream commit 7839d0078e ]

It is reported that in low-memory situations the system-wide resume core
code deadlocks, because async_schedule_dev() executes its argument
function synchronously if it cannot allocate memory (and not only in
that case) and that function attempts to acquire a mutex that is already
held.  Executing the argument function synchronously from within
dpm_async_fn() may also be problematic for ordering reasons (it may
cause a consumer device's resume callback to be invoked before a
requisite supplier device's one, for example).

Address this by changing the code in question to use
async_schedule_dev_nocall() for scheduling the asynchronous
execution of device suspend and resume functions and to directly
run them synchronously if async_schedule_dev_nocall() returns false.

Link: https://lore.kernel.org/linux-pm/ZYvjiqX6EsL15moe@perf/
Reported-by: Youngmin Nam <youngmin.nam@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Tested-by: Youngmin Nam <youngmin.nam@samsung.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Cc: 5.7+ <stable@vger.kernel.org> # 5.7+: 6aa09a5bcc async: Split async_schedule_node_domain()
Cc: 5.7+ <stable@vger.kernel.org> # 5.7+: 7d4b5d7a37 async: Introduce async_schedule_dev_nocall()
Cc: 5.7+ <stable@vger.kernel.org> # 5.7+
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-01-31 16:17:09 -08:00
..
clock_ops.c PM: runtime: add devm_pm_clk_create helper 2021-08-26 11:28:07 -07:00
common.c PM: domains: Extend dev_pm_domain_detach() doc 2022-04-13 17:07:58 +02:00
domain.c PM: domains: Move the verification of in-params from genpd_add_device() 2023-07-19 16:21:01 +02:00
domain_governor.c PM: domains: Allocate governor data dynamically based on a genpd governor 2022-05-19 20:16:05 +02:00
generic_ops.c drivers: base: power: add proper SPDX identifiers on files that did not have them. 2019-04-04 20:03:40 +02:00
main.c PM: sleep: Fix possible deadlocks in core system-wide PM code 2024-01-31 16:17:09 -08:00
Makefile PM / QoS: Initial kunit test 2019-11-29 12:04:49 +01:00
power.h PM: sleep: wakeirq: fix wake irq arming 2023-08-03 10:24:16 +02:00
qos-test.c kunit: allow kunit tests to be loaded as a module 2020-01-09 16:42:29 -07:00
qos.c PM / QoS: Restore DEV_PM_QOS_MIN/MAX_FREQUENCY 2019-11-29 12:04:50 +01:00
runtime.c PM: runtime: Do not call __rpm_callback() from rpm_idle() 2022-12-31 13:31:59 +01:00
sysfs.c drivers core: Miscellaneous changes for sysfs_emit 2020-10-02 13:12:07 +02:00
trace.c rtc: Extend timeout for waiting for UIP to clear to 1s 2024-01-31 16:17:01 -08:00
wakeirq.c PM: sleep: wakeirq: fix wake irq arming 2023-08-03 10:24:16 +02:00
wakeup.c PM: wakeup: Add extra debugging statement for multiple active IRQs 2022-09-03 20:04:33 +02:00
wakeup_stats.c PM: wakeup: remove redundant assignment to variable retval 2021-04-22 15:22:38 +02:00