From: Hans de Goede Date: Sun, 14 Jan 2018 20:01:48 +0000 (+0100) Subject: ACPI / LPSS: Do not instiate platform_dev for devs without MMIO resources X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4e7284b34c78a11f04452621b3eb41e1bdb83bff;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git 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 Acked-by: Mika Westerberg Reviewed-by: Andy Shevchenko Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- 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;