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authorRafael J. Wysocki <rjw@sisk.pl>2011-02-08 23:40:37 +0100
committerRafael J. Wysocki <rjw@sisk.pl>2011-02-24 19:58:53 +0100
commit5190726765b40774c069e187a958e10ccd970e65 (patch)
tree6cdfc76171e907232f91e4a094ee8ffbcc8e9797
parent2aa15890f3c191326678f1bd68af61ec6b8753ec (diff)
ACPI: Remove the wakeup.run_wake_count device field
The wakeup.run_wake_count ACPI device field is only used by the PCI runtime PM code to "protect" devices from being prepared for generating wakeup signals more than once in a row. However, it really doesn't provide any protection, because (1) all of the functions it is supposed to protect use their own reference counters effectively ensuring that the device will be set up for generating wakeup signals just once and (2) the PCI runtime PM code uses wakeup.run_wake_count in a racy way, since nothing prevents acpi_dev_run_wake() from being called concurrently from two different threads for the same device. Remove the wakeup.run_wake_count ACPI device field which is unnecessary, confusing and used in a wrong way. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
-rw-r--r--drivers/acpi/button.c2
-rw-r--r--drivers/acpi/scan.c1
-rw-r--r--drivers/pci/pci-acpi.c16
-rw-r--r--include/acpi/acpi_bus.h1
4 files changed, 4 insertions, 16 deletions
diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 76bbb78a5ad..e643a0936dc 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -430,7 +430,6 @@ static int acpi_button_add(struct acpi_device *device)
/* Button's GPE is run-wake GPE */
acpi_enable_gpe(device->wakeup.gpe_device,
device->wakeup.gpe_number);
- device->wakeup.run_wake_count++;
device_set_wakeup_enable(&device->dev, true);
}
@@ -453,7 +452,6 @@ static int acpi_button_remove(struct acpi_device *device, int type)
if (device->wakeup.flags.valid) {
acpi_disable_gpe(device->wakeup.gpe_device,
device->wakeup.gpe_number);
- device->wakeup.run_wake_count--;
device_set_wakeup_enable(&device->dev, false);
}
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index b99e6249460..b136c9c1e53 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -797,7 +797,6 @@ static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
acpi_status status;
acpi_event_status event_status;
- device->wakeup.run_wake_count = 0;
device->wakeup.flags.notifier_present = 0;
/* Power button, Lid switch always enable wakeup */
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 6fe0772e0e7..7c3b18e78ce 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -293,19 +293,11 @@ static int acpi_dev_run_wake(struct device *phys_dev, bool enable)
}
if (enable) {
- if (!dev->wakeup.run_wake_count++) {
- acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
- acpi_enable_gpe(dev->wakeup.gpe_device,
- dev->wakeup.gpe_number);
- }
- } else if (dev->wakeup.run_wake_count > 0) {
- if (!--dev->wakeup.run_wake_count) {
- acpi_disable_gpe(dev->wakeup.gpe_device,
- dev->wakeup.gpe_number);
- acpi_disable_wakeup_device_power(dev);
- }
+ acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
+ acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
} else {
- error = -EALREADY;
+ acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
+ acpi_disable_wakeup_device_power(dev);
}
return error;
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 78ca429929f..f50ebb9bc53 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -250,7 +250,6 @@ struct acpi_device_wakeup {
struct acpi_handle_list resources;
struct acpi_device_wakeup_flags flags;
int prepare_count;
- int run_wake_count;
};
/* Device */