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>

4 files changed, 4 insertions, 16 deletions

diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 76bbb78a5ad9..e643a0936dc4 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 b99e62494607..b136c9c1e531 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 6fe0772e0e7d..7c3b18e78cee 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 78ca429929f7..f50ebb9bc53b 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 */