diff options
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/power.h | 2 | ||||
| -rw-r--r-- | kernel/power/snapshot.c | 19 | ||||
| -rw-r--r-- | kernel/power/swsusp.c | 75 |
3 files changed, 47 insertions, 49 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h index 893ee655085..6c042b5ee14 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -65,10 +65,8 @@ extern suspend_pagedir_t *pagedir_save; extern asmlinkage int swsusp_arch_suspend(void); extern asmlinkage int swsusp_arch_resume(void); -extern int restore_highmem(void); extern void free_pagedir(struct pbe *pblist); extern struct pbe *alloc_pagedir(unsigned nr_pages, gfp_t gfp_mask, int safe_needed); extern void create_pbe_list(struct pbe *pblist, unsigned nr_pages); extern void swsusp_free(void); extern int alloc_data_pages(struct pbe *pblist, gfp_t gfp_mask, int safe_needed); -extern int enough_swap(unsigned nr_pages); diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index b8a2e9a6320..4a6dbcefd37 100644 --- a/kernel/power/snapshot.c +++ b/kernel/power/snapshot.c @@ -88,8 +88,7 @@ static int save_highmem_zone(struct zone *zone) return 0; } - -static int save_highmem(void) +int save_highmem(void) { struct zone *zone; int res = 0; @@ -120,11 +119,7 @@ int restore_highmem(void) } return 0; } -#else -static int save_highmem(void) { return 0; } -int restore_highmem(void) { return 0; } -#endif /* CONFIG_HIGHMEM */ - +#endif static int pfn_is_nosave(unsigned long pfn) { @@ -416,11 +411,6 @@ asmlinkage int swsusp_save(void) unsigned int nr_pages; pr_debug("swsusp: critical section: \n"); - if (save_highmem()) { - printk(KERN_CRIT "swsusp: Not enough free pages for highmem\n"); - restore_highmem(); - return -ENOMEM; - } drain_local_pages(); nr_pages = count_data_pages(); @@ -440,11 +430,6 @@ asmlinkage int swsusp_save(void) return -ENOMEM; } - if (!enough_swap(nr_pages)) { - printk(KERN_ERR "swsusp: Not enough free swap\n"); - return -ENOSPC; - } - pagedir_nosave = swsusp_alloc(nr_pages); if (!pagedir_nosave) return -ENOMEM; diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c index 8511c7f3386..c05f46e7348 100644 --- a/kernel/power/swsusp.c +++ b/kernel/power/swsusp.c @@ -73,6 +73,14 @@ #include "power.h" +#ifdef CONFIG_HIGHMEM +int save_highmem(void); +int restore_highmem(void); +#else +static int save_highmem(void) { return 0; } +static int restore_highmem(void) { return 0; } +#endif + #define CIPHER "aes" #define MAXKEY 32 #define MAXIV 32 @@ -500,6 +508,26 @@ static int write_pagedir(void) } /** + * enough_swap - Make sure we have enough swap to save the image. + * + * Returns TRUE or FALSE after checking the total amount of swap + * space avaiable. + * + * FIXME: si_swapinfo(&i) returns all swap devices information. + * We should only consider resume_device. + */ + +static int enough_swap(unsigned int nr_pages) +{ + struct sysinfo i; + + si_swapinfo(&i); + pr_debug("swsusp: available swap: %lu pages\n", i.freeswap); + return i.freeswap > (nr_pages + PAGES_FOR_IO + + (nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE); +} + +/** * write_suspend_image - Write entire image and metadata. * */ @@ -507,6 +535,11 @@ static int write_suspend_image(void) { int error; + if (!enough_swap(nr_copy_pages)) { + printk(KERN_ERR "swsusp: Not enough free swap\n"); + return -ENOSPC; + } + init_header(); if ((error = data_write())) goto FreeData; @@ -526,27 +559,6 @@ static int write_suspend_image(void) goto Done; } -/** - * enough_swap - Make sure we have enough swap to save the image. - * - * Returns TRUE or FALSE after checking the total amount of swap - * space avaiable. - * - * FIXME: si_swapinfo(&i) returns all swap devices information. - * We should only consider resume_device. - */ - -int enough_swap(unsigned int nr_pages) -{ - struct sysinfo i; - - si_swapinfo(&i); - pr_debug("swsusp: available swap: %lu pages\n", i.freeswap); - return i.freeswap > (nr_pages + PAGES_FOR_IO + - (nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE); -} - - /* It is important _NOT_ to umount filesystems at this point. We want * them synced (in case something goes wrong) but we DO not want to mark * filesystem clean: it is not. (And it does not matter, if we resume @@ -556,12 +568,15 @@ int swsusp_write(void) { int error; + if ((error = swsusp_swap_check())) { + printk(KERN_ERR "swsusp: cannot find swap device, try swapon -a.\n"); + return error; + } lock_swapdevices(); error = write_suspend_image(); /* This will unlock ignored swap devices since writing is finished */ lock_swapdevices(); return error; - } @@ -569,6 +584,7 @@ int swsusp_write(void) int swsusp_suspend(void) { int error; + if ((error = arch_prepare_suspend())) return error; local_irq_disable(); @@ -580,15 +596,12 @@ int swsusp_suspend(void) */ if ((error = device_power_down(PMSG_FREEZE))) { printk(KERN_ERR "Some devices failed to power down, aborting suspend\n"); - local_irq_enable(); - return error; + goto Enable_irqs; } - if ((error = swsusp_swap_check())) { - printk(KERN_ERR "swsusp: cannot find swap device, try swapon -a.\n"); - device_power_up(); - local_irq_enable(); - return error; + if ((error = save_highmem())) { + printk(KERN_ERR "swsusp: Not enough free pages for highmem\n"); + goto Restore_highmem; } save_processor_state(); @@ -596,8 +609,10 @@ int swsusp_suspend(void) printk(KERN_ERR "Error %d suspending\n", error); /* Restore control flow magically appears here */ restore_processor_state(); +Restore_highmem: restore_highmem(); device_power_up(); +Enable_irqs: local_irq_enable(); return error; } @@ -804,7 +819,7 @@ static int check_sig(void) * Reset swap signature now. */ error = bio_write_page(0, &swsusp_header); - } else { + } else { return -EINVAL; } if (!error) |