ACPI: power: Skip duplicate power resource references in _PRx

Some ACPI tables contain duplicate power resource references like this:

        Name (_PR0, Package (0x04)  // _PR0: Power Resources for D0
        {
            P28P,
            P18P,
            P18P,
            CLK4
        })

This causes a WARN_ON in sysfs_add_link_to_group() because we end up
adding a link to the same acpi_device twice:

sysfs: cannot create duplicate filename '/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/808622C1:00/OVTI2680:00/power_resources_D0/LNXPOWER:0a'
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.19.12-301.fc29.x86_64 #1
Hardware name: Insyde CherryTrail/Type2 - Board Product Name, BIOS jumperx.T87.KFBNEEA02 04/13/2016
Call Trace:
 dump_stack+0x5c/0x80
 sysfs_warn_dup.cold.3+0x17/0x2a
 sysfs_do_create_link_sd.isra.2+0xa9/0xb0
 sysfs_add_link_to_group+0x30/0x50
 acpi_power_expose_list+0x74/0xa0
 acpi_power_add_remove_device+0x50/0xa0
 acpi_add_single_object+0x26b/0x5f0
 acpi_bus_check_add+0xc4/0x250
 ...

To address this issue, make acpi_extract_power_resources() check for
duplicates and simply skip them when found.

Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
[ rjw: Subject & changelog, comments ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 1b475bc1ae169cb904f0c33cd32bd0600b520748..665e93ca0b40fb7b0d1b009b87fb1be64f45342f 100644 (file)
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -131,6 +131,23 @@ void acpi_power_resources_list_free(struct list_head *list)
        }
 }
 
+static bool acpi_power_resource_is_dup(union acpi_object *package,
+                                      unsigned int start, unsigned int i)
+{
+       acpi_handle rhandle, dup;
+       unsigned int j;
+
+       /* The caller is expected to check the package element types */
+       rhandle = package->package.elements[i].reference.handle;
+       for (j = start; j < i; j++) {
+               dup = package->package.elements[j].reference.handle;
+               if (dup == rhandle)
+                       return true;
+       }
+
+       return false;
+}
+
 int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
                                 struct list_head *list)
 {
@@ -150,6 +167,11 @@ int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
                        err = -ENODEV;
                        break;
                }
+
+               /* Some ACPI tables contain duplicate power resource references */
+               if (acpi_power_resource_is_dup(package, start, i))
+                       continue;
+
                err = acpi_add_power_resource(rhandle);
                if (err)
                        break;