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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2024-02-26 17:40:52 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2024-02-27 17:54:59 +0100 |
| commit | 1b4f02a34f095b96de36fa16755f5598ba380939 (patch) | |
| tree | 72733ca7c3c494c0a93f3b905c03174ed4665466 /drivers/acpi | |
| parent | 514bcabc05387369ee491b8359f34fcd45f25f55 (diff) | |
| download | lwn-1b4f02a34f095b96de36fa16755f5598ba380939.tar.gz lwn-1b4f02a34f095b96de36fa16755f5598ba380939.zip | |
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 <rafael.j.wysocki@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/acpi_processor.c | 3 | ||||
| -rw-r--r-- | drivers/acpi/internal.h | 1 | ||||
| -rw-r--r-- | drivers/acpi/scan.c | 5 |
3 files changed, 9 insertions, 0 deletions
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) |