From 1b4f02a34f095b96de36fa16755f5598ba380939 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 26 Feb 2024 17:40:52 +0100 Subject: ACPI: scan: Make acpi_processor_add() check the device enabled bit Modify acpi_processor_add() return an error if _STA returns the enabled bit clear for the given processor device, so as to avoid using processors that don't decode their resources, as per the ACPI specification. [1] Link: https://uefi.org/specs/ACPI/6.5/06_Device_Configuration.html#sta-device-status # [1] Signed-off-by: Rafael J. Wysocki Reviewed-by: Jonathan Cameron --- drivers/acpi/acpi_processor.c | 3 +++ drivers/acpi/internal.h | 1 + drivers/acpi/scan.c | 5 +++++ 3 files changed, 9 insertions(+) (limited to 'drivers/acpi') diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index 4fe2ef54088c..99c28b7307c3 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -381,6 +381,9 @@ static int acpi_processor_add(struct acpi_device *device, struct device *dev; int result = 0; + if (!acpi_device_is_enabled(device)) + return -ENODEV; + pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL); if (!pr) return -ENOMEM; diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index 6588525c45ef..895aa2c0ad58 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -121,6 +121,7 @@ int acpi_device_setup_files(struct acpi_device *dev); void acpi_device_remove_files(struct acpi_device *dev); void acpi_device_add_finalize(struct acpi_device *device); void acpi_free_pnp_ids(struct acpi_device_pnp *pnp); +bool acpi_device_is_enabled(const struct acpi_device *adev); bool acpi_device_is_present(const struct acpi_device *adev); bool acpi_device_is_battery(struct acpi_device *adev); bool acpi_device_is_first_physical_node(struct acpi_device *adev, diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index e641a7c87358..fddcb1691fd3 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1945,6 +1945,11 @@ bool acpi_device_is_present(const struct acpi_device *adev) return adev->status.present || adev->status.functional; } +bool acpi_device_is_enabled(const struct acpi_device *adev) +{ + return adev->status.present && adev->status.enabled; +} + static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, const char *idstr, const struct acpi_device_id **matchid) -- cgit