Rafael J. Wysocki 4fb352df14 PM: sleep: Do not flag runtime PM workqueue as freezable ... Till now, the runtime PM workqueue has been flagged as freezable, so it does not process work items during system-wide PM transitions like system suspend and resume. The original reason to do that was to reduce the likelihood of runtime PM getting in the way of system-wide PM processing, but now it is mostly an optimization because (1) runtime suspend of devices is prevented by bumping up their runtime PM usage counters in device_prepare() and (2) device drivers are expected to disable runtime PM for the devices handled by them before they embark on system-wide PM activities that may change the state of the hardware or otherwise interfere with runtime PM. However, it prevents asynchronous runtime resume of devices from working during system-wide PM transitions, which is confusing because synchronous runtime resume is not prevented at the same time, and it also sometimes turns out to be problematic. For example, it has been reported that blk_queue_enter() may deadlock during a system suspend transition because of the pm_request_resume() usage in it [1]. It may also deadlock during a system resume transition in a similar way. That happens because the asynchronous runtime resume of the given device is not processed due to the freezing of the runtime PM workqueue. While it may be better to address this particular issue in the block layer, the very presence of it means that similar problems may be expected to occur elsewhere. For this reason, remove the WQ_FREEZABLE flag from the runtime PM workqueue and make device_suspend_late() use the generic variant of pm_runtime_disable() that will carry out runtime PM of the device synchronously if there is pending resume work for it. Also update the comment before the pm_runtime_disable() call in device_suspend_late(), to document the fact that the runtime PM should not be expected to work for the device until the end of device_resume_early(), and update the related documentation. This change may, even though it is not expected to, uncover some latent issues related to queuing up asynchronous runtime resume work items during system suspend or hibernation. However, they should be limited to the interference between runtime resume and system-wide PM callbacks in the cases when device drivers start to handle system-wide PM before disabling runtime PM as described above. Link: https://lore.kernel.org/linux-pm/20251126101636.205505-2-yang.yang@vivo.com/ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Link: https://patch.msgid.link/12794222.O9o76ZdvQC@rafael.j.wysocki		2025-12-15 12:20:02 +01:00
..
bpf	Some filesystems use a kinda-sorta controlled dentry refcount leak to pin	2025-12-05 14:36:21 -08:00
cgroup	Significant patch series in this merge are as follows:	2025-12-05 13:52:43 -08:00
configs	hung_task: panic when there are more than N hung tasks at the same time	2025-11-12 10:00:14 -08:00
debug	kdb: Adapt kdb_msg_write to work with NBCON consoles	2025-10-24 12:56:20 +02:00
dma	dma-mapping fixes for Linux 6.19:	2025-12-11 08:14:23 +09:00
entry	rseq: Switch to TIF_RSEQ if supported	2025-11-04 08:35:37 +01:00
events	perf/core: Fix missing read event generation on task exit	2025-12-09 12:22:25 +01:00
futex	Futex changes for v6.19:	2025-12-10 17:21:30 +09:00
gcov	gcov: add support for GCC 15	2025-11-09 21:19:44 -08:00
irq	Misc fixes:	2025-12-14 06:07:09 +12:00
kcsan	Kernel Concurrency Sanitizer (KCSAN) updates for v6.18	2025-10-02 08:31:44 -07:00
livepatch	livepatching changes for 6.19	2025-12-03 13:46:48 -08:00
liveupdate	mm: memfd_luo: add CONFIG_SHMEM dependency	2025-12-10 16:07:44 -08:00
locking	RCU pull request for v6.19	2025-12-03 12:18:07 -08:00
module	Significant patch series in this pull request:	2025-12-06 14:01:20 -08:00
power	PM: sleep: Do not flag runtime PM workqueue as freezable	2025-12-15 12:20:02 +01:00
printk	soc: driver updates for 6.19	2025-12-05 17:29:04 -08:00
rcu	RCU pull request for v6.19	2025-12-03 12:18:07 -08:00
sched	Miscellaneous scheduler fixes/cleanups:	2025-12-06 12:31:21 -08:00
time	soc: driver updates for 6.19	2025-12-05 17:29:04 -08:00
trace	tracing fixes for v6.19:	2025-12-06 13:49:40 -08:00
unwind	unwind_user/x86: Teach FP unwind about start of function	2025-10-29 10:29:58 +01:00
.gitignore	kheaders: rebuild kheaders_data.tar.xz when a file is modified within a minute	2025-06-24 20:30:37 +09:00
Kconfig.freezer	…
Kconfig.hz	kernel: Fix "select" wording on HZ_250 description	2025-02-21 09:20:30 +01:00
Kconfig.kexec	liveupdate: kho: move to kernel/liveupdate	2025-11-27 14:24:33 -08:00
Kconfig.locks	…
Kconfig.preempt	softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT	2025-09-17 16:25:41 +02:00
Makefile	liveupdate: kho: move to kernel/liveupdate	2025-11-27 14:24:33 -08:00
acct.c	act: use credential guards in acct_write_process()	2025-11-04 12:36:49 +01:00
async.c	…
audit.c	audit: fix skb leak when audit rate limit is exceeded	2025-09-10 19:55:00 -04:00
audit.h	audit: fix comment misindentation in audit.h	2025-10-22 19:28:06 -04:00
audit_fsnotify.c	VFS/audit: introduce kern_path_parent() for audit	2025-09-23 12:37:35 +02:00
audit_tree.c	mount-related stuff for this cycle	2025-10-03 10:19:44 -07:00
audit_watch.c	VFS/audit: introduce kern_path_parent() for audit	2025-09-23 12:37:35 +02:00
auditfilter.c	audit: Use kzalloc() instead of kmalloc()/memset() in audit_krule_to_data()	2025-11-07 16:38:34 -05:00
auditsc.c	audit: merge loops in __audit_inode_child()	2025-11-07 16:50:42 -05:00
backtracetest.c	…
bounds.c	x86/asm: Remove ANNOTATE_DATA_SPECIAL usage	2025-12-03 16:53:19 +01:00
capability.c	capability: Remove unused has_capability	2025-03-07 22:03:09 -06:00
cfi.c	cfi: Move BPF CFI types and helpers to generic code	2025-07-31 18:23:53 -07:00
compat.c	…
configs.c	…
context_tracking.c	context_tracking: Make RCU watch ct_kernel_exit_state() warning	2025-03-04 18:44:29 -08:00
cpu.c	cpu: Make atomic hotplug callbacks run with interrupts disabled on UP	2025-12-10 15:49:11 +09:00
cpu_pm.c	syscore: Pass context data to callbacks	2025-11-14 10:01:52 +01:00
crash_core.c	crash: fix crashkernel resource shrink	2025-11-15 10:52:01 -08:00
crash_core_test.c	crash: add KUnit tests for crash_exclude_mem_range	2025-09-13 17:32:55 -07:00
crash_dump_dm_crypt.c	crash_dump: retrieve dm crypt keys in kdump kernel	2025-05-21 10:48:21 -07:00
crash_reserve.c	crash: let architecture decide crash memory export to iomem_resource	2025-11-12 10:00:15 -08:00
cred.c	kernel-6.19-rc1.cred	2025-12-01 13:45:41 -08:00
delayacct.c	delayacct: remove redundant code and adjust indentation	2025-05-27 19:40:33 -07:00
dma.c	…
elfcorehdr.c	…
exec_domain.c	…
exit.c	Significant patch series in this pull request:	2025-12-06 14:01:20 -08:00
exit.h	…
extable.c	…
fail_function.c	…
fork.c	Significant patch series in this pull request:	2025-12-06 14:01:20 -08:00
freezer.c	freezer: Clarify that only cgroup1 freezer uses PM freezer	2025-10-30 20:10:27 +01:00
gen_kheaders.sh	kheaders: make it possible to override TAR	2025-08-06 10:23:36 +09:00
groups.c	…
hung_task.c	hung_task: add hung_task_sys_info sysctl to dump sys info on task-hung	2025-11-20 14:03:43 -08:00
iomem.c	mm/memremap: Pass down MEMREMAP_* flags to arch_memremap_wb()	2025-02-21 15:05:38 +01:00
irq_work.c	kasan: make kasan_record_aux_stack_noalloc() the default behaviour	2025-01-13 22:40:36 -08:00
jump_label.c	jump_label: Use RCU in all users of __module_text_address().	2025-03-10 11:54:46 +01:00
kallsyms.c	kallsyms: Fix wrong "big" kernel symbol type read from procfs	2025-11-24 16:56:24 +01:00
kallsyms_internal.h	…
kallsyms_selftest.c	kallsyms: use kmalloc_array() instead of kmalloc()	2025-09-28 11:36:14 -07:00
kallsyms_selftest.h	…
kcmp.c	kcmp: improve performance adding an unlikely hint to task comparisons	2025-02-21 10:25:33 +01:00
kcov.c	kcov: use write memory barrier after memcpy() in kcov_move_area()	2025-09-13 17:32:44 -07:00
kexec.c	kexec: enable CMA based contiguous allocation	2025-08-02 12:01:38 -07:00
kexec_core.c	kexec: move sysfs entries to /sys/kernel/kexec	2025-11-27 14:24:42 -08:00
kexec_elf.c	kexec: initialize ELF lowest address to ULONG_MAX	2025-03-16 22:30:47 -07:00
kexec_file.c	x86/kexec: carry forward the boot DTB on kexec	2025-09-13 17:32:43 -07:00
kexec_internal.h	kexec: enable CMA based contiguous allocation	2025-08-02 12:01:38 -07:00
kheaders.c	kheaders: Simplify attribute through __BIN_ATTR_SIMPLE_RO()	2024-12-24 09:46:49 +01:00
kprobes.c	kprobes: Add missing kerneldoc for __get_insn_slot	2025-07-15 18:45:34 +09:00
kstack_erase.c	sysctl: remove __user qualifier from stack_erasing_sysctl buffer argument	2025-11-27 15:44:53 +01:00
ksyms_common.c	…
ksysfs.c	kexec: move sysfs entries to /sys/kernel/kexec	2025-11-27 14:24:42 -08:00
kthread.c	sched: Rename do_set_cpus_allowed()	2025-10-16 11:13:53 +02:00
latencytop.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
module_signature.c	…
notifier.c	…
nscommon.c	ns: rename is_initial_namespace()	2025-11-11 10:01:31 +01:00
nsproxy.c	nsproxy: fix free_nsproxy() and simplify create_new_namespaces()	2025-11-14 13:10:38 +01:00
nstree.c	nstree: fix kernel-doc comments for internal functions	2025-11-14 13:10:38 +01:00
padata.c	padata: remove __padata_list_init()	2025-11-14 18:15:49 +08:00
panic.c	Significant patch series in this pull request:	2025-12-06 14:01:20 -08:00
params.c	params: Replace deprecated strcpy() with strscpy() and memcpy()	2025-08-16 21:47:25 +02:00
pid.c	ns: drop custom reference count initialization for initial namespaces	2025-11-11 10:01:32 +01:00
pid_namespace.c	pid: rely on common reference count behavior	2025-11-11 10:01:32 +01:00
pid_sysctl.h	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
profile.c	…
ptrace.c	rseq: Introduce struct rseq_data	2025-11-04 08:30:50 +01:00
range.c	…
reboot.c	- The 7 patch series "powerpc/crash: use generic crashkernel	2025-04-01 10:06:52 -07:00
regset.c	…
relay.c	relay: update relay to use mmap_prepare	2025-11-16 17:28:11 -08:00
resource.c	Reinstate "resource: avoid unnecessary lookups in find_next_iomem_res()"	2025-11-27 14:24:45 -08:00
resource_kunit.c	…
rseq.c	rseq: Switch to fast path processing on exit to user	2025-11-04 08:34:39 +01:00
scftorture.c	scftorture: Handle NULL argument passed to scf_add_to_free_list().	2024-11-14 16:09:51 -08:00
scs.c	scs: fix a wrong parameter in __scs_magic	2025-11-12 10:00:13 -08:00
seccomp.c	Performance events updates for v6.18:	2025-09-30 11:11:21 -07:00
signal.c	signal: Move MMCID exit out of sighand lock	2025-11-25 19:45:40 +01:00
smp.c	smp: Introduce a helper function to check for pending IPIs	2025-11-19 18:06:50 +01:00
smpboot.c	sched/smp: Use the SMP version of idle_thread_set_boot_cpu()	2025-06-13 08:47:20 +02:00
smpboot.h	…
softirq.c	softirq: Allow to drop the softirq-BKL lock on PREEMPT_RT	2025-09-17 16:25:41 +02:00
stacktrace.c	…
static_call.c	…
static_call_inline.c	Modules changes for 6.15-rc1	2025-03-30 15:44:36 -07:00
stop_machine.c	sched/core: Fix migrate_swap() vs. hotplug	2025-07-01 15:02:03 +02:00
sys.c	Patch series in this pull request:	2025-10-02 18:44:54 -07:00
sys_ni.c	uprobes/x86: Add uprobe syscall to speed up uprobe	2025-08-21 20:09:20 +02:00
sysctl-test.c	sysctl: move u8 register test to lib/test_sysctl.c	2025-04-14 14:13:41 +02:00
sysctl.c	sysctl: Wrap do_proc_douintvec with the public function proc_douintvec_conv	2025-11-27 15:45:38 +01:00
task_work.c	task_work: Fix NMI race condition	2025-10-29 10:29:54 +01:00
taskstats.c	…
torture.c	torture: Delay CPU-hotplug operations until boot completes	2025-08-14 15:26:30 -07:00
tracepoint.c	tracepoint: Print the function symbol when tracepoint_debug is set	2025-03-21 15:30:10 -04:00
tsacct.c	pid: change bacct_add_tsk() to use task_ppid_nr_ns()	2025-08-19 13:38:20 +02:00
ucount.c	ucount: use atomic_long_try_cmpxchg() in atomic_long_inc_below()	2025-08-02 12:01:38 -07:00
uid16.c	…
uid16.h	…
umh.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
up.c	…
user-return-notifier.c	…
user.c	ns: drop custom reference count initialization for initial namespaces	2025-11-11 10:01:32 +01:00
user_namespace.c	ns: move ns type into struct ns_common	2025-09-25 09:23:54 +02:00
utsname.c	namespace-6.18-rc1	2025-09-29 11:20:29 -07:00
utsname_sysctl.c	treewide: const qualify ctl_tables where applicable	2025-01-28 13:48:37 +01:00
vhost_task.c	vhost: Take a reference on the task in struct vhost_task.	2025-09-21 17:44:20 -04:00
vmcore_info.c	vmcoreinfo: track and log recoverable hardware errors	2025-11-27 14:24:44 -08:00
watch_queue.c	watch_queue: Use local kmap in post_one_notification()	2025-11-19 12:17:28 +01:00
watchdog.c	Significant patch series in this pull request:	2025-12-06 14:01:20 -08:00
watchdog_buddy.c	watchdog: fix opencoded cpumask_next_wrap() in watchdog_next_cpu()	2025-07-31 11:28:03 -04:00
watchdog_perf.c	watchdog: skip checks when panic is in progress	2025-09-13 17:32:53 -07:00
workqueue.c	workqueue: Don't rely on wq->rescuer to stop rescuer	2025-11-21 09:45:36 -10:00
workqueue_internal.h	…