Skip to content

Commit

Permalink
acpi: widen acpi_evaluate_dsm() revision and function-index arguments
Browse files Browse the repository at this point in the history
The ACPI specification states that arguments "Revision ID" and "Function
Index" to a _DSM are type "Integer."  Type Integers are 64 bit
quantities.

The function evaluate_dsm specifies these types as simple "int" which
are 32 bits.  Widen type passed to acpi_evaluate_dsm and its callers and
derived callers to pass correct type.

acpi_check_dsm and acpi_evaluate_dsm_typed had similar issue and were
corrected as well.

This is in preparation for libnvdimm implementing a generic _DSM
passthrough facility to have the capacity to pass 64-bit values as the
ACPI specification allows.

[djbw: clarify the changelog, add rationale]
Signed-off-by: Jerry Hoemann <jerry.hoemann@hpe.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
  • Loading branch information
Jerry Hoemann authored and Dan Williams committed Apr 11, 2016
1 parent bf16200 commit c7e16e5
Show file tree
Hide file tree
Showing 2 changed files with 5 additions and 5 deletions.
4 changes: 2 additions & 2 deletions drivers/acpi/utils.c
Original file line number Diff line number Diff line change
Expand Up @@ -625,7 +625,7 @@ acpi_status acpi_evaluate_lck(acpi_handle handle, int lock)
* some old BIOSes do expect a buffer or an integer etc.
*/
union acpi_object *
acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid, int rev, int func,
acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid, u64 rev, u64 func,
union acpi_object *argv4)
{
acpi_status ret;
Expand Down Expand Up @@ -674,7 +674,7 @@ EXPORT_SYMBOL(acpi_evaluate_dsm);
* functions. Currently only support 64 functions at maximum, should be
* enough for now.
*/
bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, int rev, u64 funcs)
bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, u64 rev, u64 funcs)
{
int i;
u64 mask = 0;
Expand Down
6 changes: 3 additions & 3 deletions include/acpi/acpi_bus.h
Original file line number Diff line number Diff line change
Expand Up @@ -61,12 +61,12 @@ bool acpi_ata_match(acpi_handle handle);
bool acpi_bay_match(acpi_handle handle);
bool acpi_dock_match(acpi_handle handle);

bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, int rev, u64 funcs);
bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, u64 rev, u64 funcs);
union acpi_object *acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid,
int rev, int func, union acpi_object *argv4);
u64 rev, u64 func, union acpi_object *argv4);

static inline union acpi_object *
acpi_evaluate_dsm_typed(acpi_handle handle, const u8 *uuid, int rev, int func,
acpi_evaluate_dsm_typed(acpi_handle handle, const u8 *uuid, u64 rev, u64 func,
union acpi_object *argv4, acpi_object_type type)
{
union acpi_object *obj;
Expand Down

0 comments on commit c7e16e5

Please sign in to comment.