diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2018-01-14 23:01:48 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-26 12:02:03 +0300 |
| commit | 4e7284b34c78a11f04452621b3eb41e1bdb83bff (patch) | |
| tree | c1258399432e3885ef339c60b60a56c0ebcf3ad8 /drivers/acpi/acpi_lpss.c | |
| parent | 7a420b5d95a5428887dbcbd338ddb36fdbdc9233 (diff) | |
| download | linux-4e7284b34c78a11f04452621b3eb41e1bdb83bff.tar.xz | |
ACPI / LPSS: Do not instiate platform_dev for devs without MMIO resources
[ Upstream commit e1681599345b8466786b6e54a2db2a00a068a3f3 ]
acpi_lpss_create_device() skips handling LPSS devices which do not have
a mmio resources in their resource list (typically these devices are
disabled by the firmware). But since the LPSS code does not bind to the
device, acpi_bus_attach() ends up still creating a platform device for
it and the regular platform_driver for the ACPI HID still tries to bind
to it.
This happens e.g. on some boards which do not use the pwm-controller
and have an empty or invalid resource-table for it. Currently this causes
these error messages to get logged:
[ 3.281966] pwm-lpss 80862288:00: invalid resource
[ 3.287098] pwm-lpss: probe of 80862288:00 failed with error -22
This commit stops the undesirable creation of a platform_device for
disabled LPSS devices by setting pnp.type.platform_id to 0. Note that
acpi_scan_attach_handler() also sets pnp.type.platform_id to 0 when there
is a matching handler for the device and that handler has no attach
callback, so we simply behave as a handler without an attach function
in this case.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/acpi/acpi_lpss.c')
| -rw-r--r-- | drivers/acpi/acpi_lpss.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c index 032ae44710e5..a2be3fd2c72b 100644 --- a/drivers/acpi/acpi_lpss.c +++ b/drivers/acpi/acpi_lpss.c @@ -465,6 +465,8 @@ static int acpi_lpss_create_device(struct acpi_device *adev, acpi_dev_free_resource_list(&resource_list); if (!pdata->mmio_base) { + /* Avoid acpi_bus_attach() instantiating a pdev for this dev. */ + adev->pnp.type.platform_id = 0; /* Skip the device, but continue the namespace scan. */ ret = 0; goto err_out; |