Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 5ae947ec authored by David Shaohua Li's avatar David Shaohua Li Committed by Len Brown
Browse files

[ACPI] Suspend to RAM fix 

Free some RAM before entering S3 so that upon
resume we can be sure early allocations will succeed.

http://bugzilla.kernel.org/show_bug.cgi?id=3469



Signed-off-by: default avatarDavid Shaohua Li <shaohua.li@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent e2a5b420

kernel/power/main.c

+14 −0
Original line number Diff line number Diff line
@@ -19,6 +19,9 @@ 


#include "power.h"



/*This is just an arbitrary number */

#define FREE_PAGE_NUMBER (100)



DECLARE_MUTEX(pm_sem);



struct pm_ops * pm_ops = NULL;
@@ -49,6 +52,7 @@ void pm_set_ops(struct pm_ops * ops) 
static int suspend_prepare(suspend_state_t state)

{

	int error = 0;

	unsigned int free_pages;



	if (!pm_ops || !pm_ops->enter)

		return -EPERM;
@@ -60,6 +64,16 @@ static int suspend_prepare(suspend_state_t state) 
		goto Thaw;

	}



	if ((free_pages = nr_free_pages()) < FREE_PAGE_NUMBER) {

		pr_debug("PM: free some memory\n");

		shrink_all_memory(FREE_PAGE_NUMBER - free_pages);

		if (nr_free_pages() < FREE_PAGE_NUMBER) {

			error = -ENOMEM;

			printk(KERN_ERR "PM: No enough memory\n");

			goto Thaw;

		}

	}



	if (pm_ops->prepare) {

		if ((error = pm_ops->prepare(state)))

			goto Thaw;