diff options
Diffstat (limited to 'drivers/base/power/main.c')
| -rw-r--r-- | drivers/base/power/main.c | 67 |
1 files changed, 55 insertions, 12 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 670c9d6c1407..69b4ddb7de3b 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -23,6 +23,7 @@ #include <linux/pm.h> #include <linux/resume-trace.h> #include <linux/rwsem.h> +#include <linux/interrupt.h> #include "../base.h" #include "power.h" @@ -107,6 +108,50 @@ void device_pm_remove(struct device *dev) } /** + * device_pm_move_before - move device in dpm_list + * @deva: Device to move in dpm_list + * @devb: Device @deva should come before + */ +void device_pm_move_before(struct device *deva, struct device *devb) +{ + pr_debug("PM: Moving %s:%s before %s:%s\n", + deva->bus ? deva->bus->name : "No Bus", + kobject_name(&deva->kobj), + devb->bus ? devb->bus->name : "No Bus", + kobject_name(&devb->kobj)); + /* Delete deva from dpm_list and reinsert before devb. */ + list_move_tail(&deva->power.entry, &devb->power.entry); +} + +/** + * device_pm_move_after - move device in dpm_list + * @deva: Device to move in dpm_list + * @devb: Device @deva should come after + */ +void device_pm_move_after(struct device *deva, struct device *devb) +{ + pr_debug("PM: Moving %s:%s after %s:%s\n", + deva->bus ? deva->bus->name : "No Bus", + kobject_name(&deva->kobj), + devb->bus ? devb->bus->name : "No Bus", + kobject_name(&devb->kobj)); + /* Delete deva from dpm_list and reinsert after devb. */ + list_move(&deva->power.entry, &devb->power.entry); +} + +/** + * device_pm_move_last - move device to end of dpm_list + * @dev: Device to move in dpm_list + */ +void device_pm_move_last(struct device *dev) +{ + pr_debug("PM: Moving %s:%s to end of list\n", + dev->bus ? dev->bus->name : "No Bus", + kobject_name(&dev->kobj)); + list_move_tail(&dev->power.entry, &dpm_list); +} + +/** * pm_op - execute the PM operation appropiate for given PM event * @dev: Device. * @ops: PM operations to choose from. @@ -305,7 +350,8 @@ static int resume_device_noirq(struct device *dev, pm_message_t state) * Execute the appropriate "noirq resume" callback for all devices marked * as DPM_OFF_IRQ. * - * Must be called with interrupts disabled and only one CPU running. + * Must be called under dpm_list_mtx. Device drivers should not receive + * interrupts while it's being executed. */ static void dpm_power_up(pm_message_t state) { @@ -326,15 +372,13 @@ static void dpm_power_up(pm_message_t state) * device_power_up - Turn on all devices that need special attention. * @state: PM transition of the system being carried out. * - * Power on system devices, then devices that required we shut them down - * with interrupts disabled. - * - * Must be called with interrupts disabled. + * Call the "early" resume handlers and enable device drivers to receive + * interrupts. */ void device_power_up(pm_message_t state) { - sysdev_resume(); dpm_power_up(state); + resume_device_irqs(); } EXPORT_SYMBOL_GPL(device_power_up); @@ -559,16 +603,17 @@ static int suspend_device_noirq(struct device *dev, pm_message_t state) * device_power_down - Shut down special devices. * @state: PM transition of the system being carried out. * - * Power down devices that require interrupts to be disabled. - * Then power down system devices. + * Prevent device drivers from receiving interrupts and call the "late" + * suspend handlers. * - * Must be called with interrupts disabled and only one CPU running. + * Must be called under dpm_list_mtx. */ int device_power_down(pm_message_t state) { struct device *dev; int error = 0; + suspend_device_irqs(); list_for_each_entry_reverse(dev, &dpm_list, power.entry) { error = suspend_device_noirq(dev, state); if (error) { @@ -577,10 +622,8 @@ int device_power_down(pm_message_t state) } dev->power.status = DPM_OFF_IRQ; } - if (!error) - error = sysdev_suspend(state); if (error) - dpm_power_up(resume_event(state)); + device_power_up(resume_event(state)); return error; } EXPORT_SYMBOL_GPL(device_power_down); |