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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-06-12 23:48:41 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-06-15 01:55:42 +0300
commit64fd1c7040880292710e6592ddc88d0d73cfb6fb (patch)
tree8b0527537fdc5cadd399266cdd3741188a6212d4 /drivers/acpi/device_pm.c
parent32c1431eea4881a6b17bd7c639315010aeefa452 (diff)
downloadlinux-64fd1c7040880292710e6592ddc88d0d73cfb6fb.tar.xz
ACPI / PM: Run wakeup notify handlers synchronously
The work functions provided by the users of acpi_add_pm_notifier() should be run synchronously before re-enabling the wakeup GPE in case they are used to clear the status and/or disable the wakeup signaling at the source. Otherwise, which is the case currently in the PCI bus type code, the same wakeup event may be signaled for multiple times while the execution of the work function in response to it has already been queued up. Fortunately, acpi_add_pm_notifier() is only used by PCI and by ACPI device PM code internally, so the change is relatively straightforward to make. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/acpi/device_pm.c')
-rw-r--r--drivers/acpi/device_pm.c27
1 files changed, 11 insertions, 16 deletions
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index 993fd31394c8..a199983390b6 100644
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -400,8 +400,8 @@ static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used)
if (adev->wakeup.flags.notifier_present) {
__pm_wakeup_event(adev->wakeup.ws, 0);
- if (adev->wakeup.context.work.func)
- queue_pm_work(&adev->wakeup.context.work);
+ if (adev->wakeup.context.func)
+ adev->wakeup.context.func(&adev->wakeup.context);
}
mutex_unlock(&acpi_pm_notifier_lock);
@@ -413,7 +413,7 @@ static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used)
* acpi_add_pm_notifier - Register PM notify handler for given ACPI device.
* @adev: ACPI device to add the notify handler for.
* @dev: Device to generate a wakeup event for while handling the notification.
- * @work_func: Work function to execute when handling the notification.
+ * @func: Work function to execute when handling the notification.
*
* NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
* PM wakeup events. For example, wakeup events may be generated for bridges
@@ -421,11 +421,11 @@ static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used)
* bridge itself doesn't have a wakeup GPE associated with it.
*/
acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,
- void (*work_func)(struct work_struct *work))
+ void (*func)(struct acpi_device_wakeup_context *context))
{
acpi_status status = AE_ALREADY_EXISTS;
- if (!dev && !work_func)
+ if (!dev && !func)
return AE_BAD_PARAMETER;
mutex_lock(&acpi_pm_notifier_lock);
@@ -435,8 +435,7 @@ acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,
adev->wakeup.ws = wakeup_source_register(dev_name(&adev->dev));
adev->wakeup.context.dev = dev;
- if (work_func)
- INIT_WORK(&adev->wakeup.context.work, work_func);
+ adev->wakeup.context.func = func;
status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY,
acpi_pm_notify_handler, NULL);
@@ -469,10 +468,7 @@ acpi_status acpi_remove_pm_notifier(struct acpi_device *adev)
if (ACPI_FAILURE(status))
goto out;
- if (adev->wakeup.context.work.func) {
- cancel_work_sync(&adev->wakeup.context.work);
- adev->wakeup.context.work.func = NULL;
- }
+ adev->wakeup.context.func = NULL;
adev->wakeup.context.dev = NULL;
wakeup_source_unregister(adev->wakeup.ws);
@@ -658,16 +654,15 @@ EXPORT_SYMBOL(acpi_pm_device_sleep_state);
/**
* acpi_pm_notify_work_func - ACPI devices wakeup notification work function.
- * @work: Work item to handle.
+ * @context: Device wakeup context.
*/
-static void acpi_pm_notify_work_func(struct work_struct *work)
+static void acpi_pm_notify_work_func(struct acpi_device_wakeup_context *context)
{
- struct device *dev;
+ struct device *dev = context->dev;
- dev = container_of(work, struct acpi_device_wakeup_context, work)->dev;
if (dev) {
pm_wakeup_event(dev, 0);
- pm_runtime_resume(dev);
+ pm_request_resume(dev);
}
}