[PATCH 1/2] PM / hibernate: Untangle power_down()
From: Rafael J. Wysocki <hidden>
Date: 2017-02-23 23:38:12
Also in:
lkml
From: Rafael J. Wysocki <redacted> The power_down() routine in the core hibernation code is not exactly straightforward (to put it lightly), so clean it up to make it avoid invoking itself recursively, among other things. Signed-off-by: Rafael J. Wysocki <redacted> --- kernel/power/hibernate.c | 35 ++++++++++++++++------------------- 1 file changed, 16 insertions(+), 19 deletions(-) Index: linux-pm/kernel/power/hibernate.c ===================================================================
--- linux-pm.orig/kernel/power/hibernate.c
+++ linux-pm/kernel/power/hibernate.c@@ -608,6 +608,22 @@ static void power_down(void) { #ifdef CONFIG_SUSPEND int error; + + if (hibernation_mode == HIBERNATION_SUSPEND) { + error = suspend_devices_and_enter(PM_SUSPEND_MEM); + if (error) { + hibernation_mode = hibernation_ops ? + HIBERNATION_PLATFORM : + HIBERNATION_SHUTDOWN; + } else { + /* Restore swap signature. */ + error = swsusp_unmark(); + if (error) + pr_err("PM: Swap will be unusable! Try swapon -a.\n"); + + return; + } + } #endif switch (hibernation_mode) {
@@ -620,25 +636,6 @@ static void power_down(void) if (pm_power_off) kernel_power_off(); break; -#ifdef CONFIG_SUSPEND - case HIBERNATION_SUSPEND: - error = suspend_devices_and_enter(PM_SUSPEND_MEM); - if (error) { - if (hibernation_ops) - hibernation_mode = HIBERNATION_PLATFORM; - else - hibernation_mode = HIBERNATION_SHUTDOWN; - power_down(); - } - /* - * Restore swap signature. - */ - error = swsusp_unmark(); - if (error) - printk(KERN_ERR "PM: Swap will be unusable! " - "Try swapon -a.\n"); - return; -#endif } kernel_halt(); /*