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Power management updates for 6.6-rc2

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Fix the handling of block devices in the test_resume mode of
 hibernation (Chen Yu).
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Merge tag 'pm-6.6-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "Fix the handling of block devices in the test_resume mode of
  hibernation (Chen Yu)"

* tag 'pm-6.6-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM: hibernate: Fix the exclusive get block device in test_resume mode
  PM: hibernate: Rename function parameter from snapshot_test to exclusive
This commit is contained in:
Linus Torvalds 2023-09-15 15:11:53 -07:00
commit 4eb2bd2475
3 changed files with 16 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
kernel/power/hibernate.c
View File

@ -786,9 +786,9 @@ int hibernate(void)
unlock_device_hotplug();
if (snapshot_test) {
pm_pr_dbg("Checking hibernation image\n");
error = swsusp_check(snapshot_test);
error = swsusp_check(false);
if (!error)
error = load_image_and_restore(snapshot_test);
error = load_image_and_restore(false);
}
thaw_processes();
@ -945,14 +945,14 @@ static int software_resume(void)
pm_pr_dbg("Looking for hibernation image.\n");
mutex_lock(&system_transition_mutex);
error = swsusp_check(false);
error = swsusp_check(true);
if (error)
goto Unlock;
/* The snapshot device should not be opened while we're running */
if (!hibernate_acquire()) {
error = -EBUSY;
swsusp_close(false);
swsusp_close(true);
goto Unlock;
}
@ -973,7 +973,7 @@ static int software_resume(void)
goto Close_Finish;
}
error = load_image_and_restore(false);
error = load_image_and_restore(true);
thaw_processes();
Finish:
pm_notifier_call_chain(PM_POST_RESTORE);
@ -987,7 +987,7 @@ static int software_resume(void)
pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
return error;
Close_Finish:
swsusp_close(false);
swsusp_close(true);
goto Finish;
}

4
kernel/power/power.h
View File

@ -168,11 +168,11 @@ extern int swsusp_swap_in_use(void);
#define SF_HW_SIG 8
/* kernel/power/hibernate.c */
int swsusp_check(bool snapshot_test);
int swsusp_check(bool exclusive);
extern void swsusp_free(void);
extern int swsusp_read(unsigned int *flags_p);
extern int swsusp_write(unsigned int flags);
void swsusp_close(bool snapshot_test);
void swsusp_close(bool exclusive);
#ifdef CONFIG_SUSPEND
extern int swsusp_unmark(void);
#endif

14
kernel/power/swap.c
View File

@ -1513,12 +1513,13 @@ end:
static void *swsusp_holder;
/**
* swsusp_check - Check for swsusp signature in the resume device
* swsusp_check - Check for swsusp signature in the resume device
* @exclusive: Open the resume device exclusively.
*/
int swsusp_check(bool snapshot_test)
int swsusp_check(bool exclusive)
{
void *holder = snapshot_test ? &swsusp_holder : NULL;
void *holder = exclusive ? &swsusp_holder : NULL;
int error;
hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device, BLK_OPEN_READ,
@ -1563,17 +1564,18 @@ put:
}
/**
* swsusp_close - close swap device.
* swsusp_close - close swap device.
* @exclusive: Close the resume device which is exclusively opened.
*/
void swsusp_close(bool snapshot_test)
void swsusp_close(bool exclusive)
{
if (IS_ERR(hib_resume_bdev)) {
pr_debug("Image device not initialised\n");
return;
}
blkdev_put(hib_resume_bdev, snapshot_test ? &swsusp_holder : NULL);
blkdev_put(hib_resume_bdev, exclusive ? &swsusp_holder : NULL);
}
/**