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Power management fixes for 5.11-rc6

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- Fix a deadlock caused by attempting to acquire the same mutex
    twice in a row in the "kexec jump" code (Baoquan He).
 
  - Modify the hibernation image saving code to flush the unwritten
    data to the swap storage later so as to avoid failing to write the
    image signature which is possible in some cases (Laurent Badel).
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Merge tag 'pm-5.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These fix a deadlock in the 'kexec jump' code and address a possible
  hibernation image creation issue.

  Specifics:

   - Fix a deadlock caused by attempting to acquire the same mutex twice
     in a row in the "kexec jump" code (Baoquan He)

   - Modify the hibernation image saving code to flush the unwritten
     data to the swap storage later so as to avoid failing to write the
     image signature which is possible in some cases (Laurent Badel)"

* tag 'pm-5.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM: hibernate: flush swap writer after marking
  kernel: kexec: remove the lock operation of system_transition_mutex
This commit is contained in:
Linus Torvalds 2021-01-29 13:30:09 -08:00
commit 32b0c410cd
2 changed files with 1 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
kernel/kexec_core.c
View file

@ -1134,7 +1134,6 @@ int kernel_kexec(void)
#ifdef CONFIG_KEXEC_JUMP
if (kexec_image->preserve_context) {
lock_system_sleep();
pm_prepare_console();
error = freeze_processes();
if (error) {
@ -1197,7 +1196,6 @@ int kernel_kexec(void)
thaw_processes();
Restore_console:
pm_restore_console();
unlock_system_sleep();
}
#endif

2
kernel/power/swap.c
View file

@ -497,10 +497,10 @@ static int swap_writer_finish(struct swap_map_handle *handle,
unsigned int flags, int error)
{
if (!error) {
flush_swap_writer(handle);
pr_info("S");
error = mark_swapfiles(handle, flags);
pr_cont("|\n");
flush_swap_writer(handle);
}
if (error)