diff options
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/hibernate.c | 23 | ||||
| -rw-r--r-- | kernel/power/main.c | 12 | ||||
| -rw-r--r-- | kernel/power/power.h | 7 | ||||
| -rw-r--r-- | kernel/power/process.c | 24 | ||||
| -rw-r--r-- | kernel/power/snapshot.c | 7 | ||||
| -rw-r--r-- | kernel/power/suspend.c | 80 | ||||
| -rw-r--r-- | kernel/power/user.c | 12 |
7 files changed, 76 insertions, 89 deletions
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index a5d4cf0aa03e..0a186cfde788 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -343,13 +343,13 @@ int hibernation_snapshot(int platform_mode) * successful freezer test. */ freezer_test_done = true; - goto Cleanup; + goto Thaw; } error = dpm_prepare(PMSG_FREEZE); if (error) { dpm_complete(PMSG_RECOVER); - goto Cleanup; + goto Thaw; } suspend_console(); @@ -385,6 +385,8 @@ int hibernation_snapshot(int platform_mode) platform_end(platform_mode); return error; + Thaw: + thaw_kernel_threads(); Cleanup: swsusp_free(); goto Close; @@ -616,7 +618,7 @@ int hibernate(void) /* Allocate memory management structures */ error = create_basic_memory_bitmaps(); if (error) - goto Exit; + goto Enable_umh; printk(KERN_INFO "PM: Syncing filesystems ... "); sys_sync(); @@ -624,15 +626,11 @@ int hibernate(void) error = freeze_processes(); if (error) - goto Finish; + goto Free_bitmaps; error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM); - if (error) - goto Thaw; - if (freezer_test_done) { - freezer_test_done = false; + if (error || freezer_test_done) goto Thaw; - } if (in_suspend) { unsigned int flags = 0; @@ -657,8 +655,13 @@ int hibernate(void) Thaw: thaw_processes(); - Finish: + + /* Don't bother checking whether freezer_test_done is true */ + freezer_test_done = false; + + Free_bitmaps: free_basic_memory_bitmaps(); + Enable_umh: usermodehelper_enable(); Exit: pm_notifier_call_chain(PM_POST_HIBERNATION); diff --git a/kernel/power/main.c b/kernel/power/main.c index 8c5014a4e052..1c12581f1c62 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -291,16 +291,10 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, #ifdef CONFIG_SUSPEND for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) { - if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) + if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { + error = pm_suspend(state); break; - } - if (state < PM_SUSPEND_MAX && *s) { - error = enter_state(state); - if (error) { - suspend_stats.fail++; - dpm_save_failed_errno(error); - } else - suspend_stats.success++; + } } #endif diff --git a/kernel/power/power.h b/kernel/power/power.h index 21724eee5206..98f3622d7407 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -177,13 +177,11 @@ extern const char *const pm_states[]; extern bool valid_state(suspend_state_t state); extern int suspend_devices_and_enter(suspend_state_t state); -extern int enter_state(suspend_state_t state); #else /* !CONFIG_SUSPEND */ static inline int suspend_devices_and_enter(suspend_state_t state) { return -ENOSYS; } -static inline int enter_state(suspend_state_t state) { return -ENOSYS; } static inline bool valid_state(suspend_state_t state) { return false; } #endif /* !CONFIG_SUSPEND */ @@ -234,16 +232,14 @@ static inline int suspend_freeze_processes(void) int error; error = freeze_processes(); - /* * freeze_processes() automatically thaws every task if freezing * fails. So we need not do anything extra upon error. */ if (error) - goto Finish; + return error; error = freeze_kernel_threads(); - /* * freeze_kernel_threads() thaws only kernel threads upon freezing * failure. So we have to thaw the userspace tasks ourselves. @@ -251,7 +247,6 @@ static inline int suspend_freeze_processes(void) if (error) thaw_processes(); - Finish: return error; } diff --git a/kernel/power/process.c b/kernel/power/process.c index 7e426459e60a..0d2aeb226108 100644 --- a/kernel/power/process.c +++ b/kernel/power/process.c @@ -53,11 +53,9 @@ static int try_to_freeze_tasks(bool user_only) * It is "frozen enough". If the task does wake * up, it will immediately call try_to_freeze. * - * Because freeze_task() goes through p's - * scheduler lock after setting TIF_FREEZE, it's - * guaranteed that either we see TASK_RUNNING or - * try_to_stop() after schedule() in ptrace/signal - * stop sees TIF_FREEZE. + * Because freeze_task() goes through p's scheduler lock, it's + * guaranteed that TASK_STOPPED/TRACED -> TASK_RUNNING + * transition can't race with task state testing here. */ if (!task_is_stopped_or_traced(p) && !freezer_should_skip(p)) @@ -98,13 +96,15 @@ static int try_to_freeze_tasks(bool user_only) elapsed_csecs / 100, elapsed_csecs % 100, todo - wq_busy, wq_busy); - read_lock(&tasklist_lock); - do_each_thread(g, p) { - if (!wakeup && !freezer_should_skip(p) && - p != current && freezing(p) && !frozen(p)) - sched_show_task(p); - } while_each_thread(g, p); - read_unlock(&tasklist_lock); + if (!wakeup) { + read_lock(&tasklist_lock); + do_each_thread(g, p) { + if (p != current && !freezer_should_skip(p) + && freezing(p) && !frozen(p)) + sched_show_task(p); + } while_each_thread(g, p); + read_unlock(&tasklist_lock); + } } else { printk("(elapsed %d.%02d seconds) ", elapsed_csecs / 100, elapsed_csecs % 100); diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index 6a768e537001..8e2e7461375f 100644 --- a/kernel/power/snapshot.c +++ b/kernel/power/snapshot.c @@ -711,9 +711,10 @@ static void mark_nosave_pages(struct memory_bitmap *bm) list_for_each_entry(region, &nosave_regions, list) { unsigned long pfn; - pr_debug("PM: Marking nosave pages: %016lx - %016lx\n", - region->start_pfn << PAGE_SHIFT, - region->end_pfn << PAGE_SHIFT); + pr_debug("PM: Marking nosave pages: [mem %#010llx-%#010llx]\n", + (unsigned long long) region->start_pfn << PAGE_SHIFT, + ((unsigned long long) region->end_pfn << PAGE_SHIFT) + - 1); for (pfn = region->start_pfn; pfn < region->end_pfn; pfn++) if (pfn_valid(pfn)) { diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 560a639614a1..88e5c967370d 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -37,8 +37,8 @@ const char *const pm_states[PM_SUSPEND_MAX] = { static const struct platform_suspend_ops *suspend_ops; /** - * suspend_set_ops - Set the global suspend method table. - * @ops: Pointer to ops structure. + * suspend_set_ops - Set the global suspend method table. + * @ops: Suspend operations to use. */ void suspend_set_ops(const struct platform_suspend_ops *ops) { @@ -58,11 +58,11 @@ bool valid_state(suspend_state_t state) } /** - * suspend_valid_only_mem - generic memory-only valid callback + * suspend_valid_only_mem - Generic memory-only valid callback. * - * Platform drivers that implement mem suspend only and only need - * to check for that in their .valid callback can use this instead - * of rolling their own .valid callback. + * Platform drivers that implement mem suspend only and only need to check for + * that in their .valid() callback can use this instead of rolling their own + * .valid() callback. */ int suspend_valid_only_mem(suspend_state_t state) { @@ -83,10 +83,11 @@ static int suspend_test(int level) } /** - * suspend_prepare - Do prep work before entering low-power state. + * suspend_prepare - Prepare for entering system sleep state. * - * This is common code that is called for each state that we're entering. - * Run suspend notifiers, allocate a console and stop all processes. + * Common code run for every system sleep state that can be entered (except for + * hibernation). Run suspend notifiers, allocate the "suspend" console and + * freeze processes. */ static int suspend_prepare(void) { @@ -131,9 +132,9 @@ void __attribute__ ((weak)) arch_suspend_enable_irqs(void) } /** - * suspend_enter - enter the desired system sleep state. - * @state: State to enter - * @wakeup: Returns information that suspend should not be entered again. + * suspend_enter - Make the system enter the given sleep state. + * @state: System sleep state to enter. + * @wakeup: Returns information that the sleep state should not be re-entered. * * This function should be called after devices have been suspended. */ @@ -199,9 +200,8 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) } /** - * suspend_devices_and_enter - suspend devices and enter the desired system - * sleep state. - * @state: state to enter + * suspend_devices_and_enter - Suspend devices and enter system sleep state. + * @state: System sleep state to enter. */ int suspend_devices_and_enter(suspend_state_t state) { @@ -251,10 +251,10 @@ int suspend_devices_and_enter(suspend_state_t state) } /** - * suspend_finish - Do final work before exiting suspend sequence. + * suspend_finish - Clean up before finishing the suspend sequence. * - * Call platform code to clean up, restart processes, and free the - * console that we've allocated. This is not called for suspend-to-disk. + * Call platform code to clean up, restart processes, and free the console that + * we've allocated. This routine is not called for hibernation. */ static void suspend_finish(void) { @@ -265,16 +265,14 @@ static void suspend_finish(void) } /** - * enter_state - Do common work of entering low-power state. - * @state: pm_state structure for state we're entering. + * enter_state - Do common work needed to enter system sleep state. + * @state: System sleep state to enter. * - * Make sure we're the only ones trying to enter a sleep state. Fail - * if someone has beat us to it, since we don't want anything weird to - * happen when we wake up. - * Then, do the setup for suspend, enter the state, and cleaup (after - * we've woken up). + * Make sure that no one else is trying to put the system into a sleep state. + * Fail if that's not the case. Otherwise, prepare for system suspend, make the + * system enter the given sleep state and clean up after wakeup. */ -int enter_state(suspend_state_t state) +static int enter_state(suspend_state_t state) { int error; @@ -310,24 +308,26 @@ int enter_state(suspend_state_t state) } /** - * pm_suspend - Externally visible function for suspending system. - * @state: Enumerated value of state to enter. + * pm_suspend - Externally visible function for suspending the system. + * @state: System sleep state to enter. * - * Determine whether or not value is within range, get state - * structure, and enter (above). + * Check if the value of @state represents one of the supported states, + * execute enter_state() and update system suspend statistics. */ int pm_suspend(suspend_state_t state) { - int ret; - if (state > PM_SUSPEND_ON && state < PM_SUSPEND_MAX) { - ret = enter_state(state); - if (ret) { - suspend_stats.fail++; - dpm_save_failed_errno(ret); - } else - suspend_stats.success++; - return ret; + int error; + + if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX) + return -EINVAL; + + error = enter_state(state); + if (error) { + suspend_stats.fail++; + dpm_save_failed_errno(error); + } else { + suspend_stats.success++; } - return -EINVAL; + return error; } EXPORT_SYMBOL(pm_suspend); diff --git a/kernel/power/user.c b/kernel/power/user.c index 3e100075b13c..33c4329205af 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -249,16 +249,10 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd, } pm_restore_gfp_mask(); error = hibernation_snapshot(data->platform_support); - if (error) { - thaw_kernel_threads(); - } else { + if (!error) { error = put_user(in_suspend, (int __user *)arg); - if (!error && !freezer_test_done) - data->ready = 1; - if (freezer_test_done) { - freezer_test_done = false; - thaw_kernel_threads(); - } + data->ready = !freezer_test_done && !error; + freezer_test_done = false; } break; |