Hongchen Zhang 3a081586c7 PM: hibernate: Enforce ordering during image compression/decompression ... commit 71cd7e80cf upstream. An S4 (suspend to disk) test on the LoongArch 3A6000 platform sometimes fails with the following error messaged in the dmesg log: Invalid LZO compressed length That happens because when compressing/decompressing the image, the synchronization between the control thread and the compress/decompress/crc thread is based on a relaxed ordering interface, which is unreliable, and the following situation may occur: CPU 0 CPU 1 save_image_lzo lzo_compress_threadfn atomic_set(&d->stop, 1); atomic_read(&data[thr].stop) data[thr].cmp = data[thr].cmp_len; WRITE data[thr].cmp_len Then CPU0 gets a stale cmp_len and writes it to disk. During resume from S4, wrong cmp_len is loaded. To maintain data consistency between the two threads, use the acquire/release variants of atomic set and read operations. Fixes: 081a9d043c ("PM / Hibernate: Improve performance of LZO/plain hibernation, checksum image") Cc: All applicable <stable@vger.kernel.org> Signed-off-by: Hongchen Zhang <zhanghongchen@loongson.cn> Co-developed-by: Weihao Li <liweihao@loongson.cn> Signed-off-by: Weihao Li <liweihao@loongson.cn> [ rjw: Subject rewrite and changelog edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-01-31 16:16:58 -08:00
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autosleep.c	PM: sleep: fix typos in comments	2021-04-08 19:37:21 +02:00
console.c
energy_model.c	PM: EM: fix memory leak with using debugfs_lookup()	2023-03-10 09:33:53 +01:00
hibernate.c	PM: hibernate: Do not get block device exclusively in test_resume mode	2023-05-11 23:03:38 +09:00
Kconfig	pm/sleep: Add PM_USERSPACE_AUTOSLEEP Kconfig	2022-07-01 10:39:20 +02:00
main.c	freezer,sched: Rewrite core freezer logic	2022-09-07 21:53:50 +02:00
Makefile	PM: sleep: Narrow down -DDEBUG on kernel/power/ files	2022-04-13 16:34:01 +02:00
power.h	PM: hibernate: Turn snapshot_test into global variable	2023-05-11 23:03:38 +09:00
poweroff.c
process.c	PM: sleep: Avoid using pr_cont() in the tasks freezing code	2023-03-03 11:52:23 +01:00
qos.c	PM: QoS: Restore support for default value on frequency QoS	2023-07-23 13:49:45 +02:00
snapshot.c	PM: hibernate: Clean up sync_read handling in snapshot_write_next()	2023-11-28 17:07:11 +00:00
suspend.c	Scheduler changes for v6.1:	2022-10-10 09:10:28 -07:00
suspend_test.c	PM: suspend: fix return value of __setup handler	2022-03-01 18:55:07 +01:00
swap.c	PM: hibernate: Enforce ordering during image compression/decompression	2024-01-31 16:16:58 -08:00
user.c	freezer: Have {,un}lock_system_sleep() save/restore flags	2022-09-07 21:53:48 +02:00
wakelock.c	PM: wakeup: simplify the output logic of pm_show_wakelocks()	2022-01-25 18:27:02 +01:00