diff options
Diffstat (limited to 'drivers/acpi/device_pm.c')
| -rw-r--r-- | drivers/acpi/device_pm.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c index 88dbbb115285..4806b7f856c4 100644 --- a/drivers/acpi/device_pm.c +++ b/drivers/acpi/device_pm.c @@ -15,10 +15,6 @@ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. - * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ @@ -1123,6 +1119,14 @@ int acpi_dev_pm_attach(struct device *dev, bool power_on) if (dev->pm_domain) return -EEXIST; + /* + * Only attach the power domain to the first device if the + * companion is shared by multiple. This is to prevent doing power + * management twice. + */ + if (!acpi_device_is_first_physical_node(adev, dev)) + return -EBUSY; + acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func); dev->pm_domain = &acpi_general_pm_domain; if (power_on) { |