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[ACPI] Suspend to RAM fix

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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: David Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
David Shaohua Li 2005-03-18 16:27:13 -05:00 committed by Len Brown
parent e2a5b420f7
commit 5ae947ecc9
1 changed files with 14 additions and 0 deletions
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14
kernel/power/main.c
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@ -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;