On Sat, Jul 22, 2017 at 12:05:39AM +0200, Rafael J. Wysocki wrote:

On Thursday, July 20, 2017 03:45:14 PM Lorenzo Pieralisi wrote:

quoted

The function acpi_dev_get_resources() is completely generic and
can be used to parse resource objects that are not necessarily
coming from the _CRS method but also from other objects eg _DMA
that have the same _CRS resource format.

Create an acpi_dev_get_resources() helper, internal to the ACPI
resources parsing compilation unit, acpi_dev_get_resources_method(),
that takes a char* parameter to detect which ACPI method should be
called to retrieve the resources list and make acpi_dev_get_resources()
call it with a method name _CRS leaving the API behaviour unchanged.

Signed-off-by: Lorenzo Pieralisi <redacted>
Cc: "Rafael J. Wysocki" <redacted>
---
 drivers/acpi/resource.c | 54 +++++++++++++++++++++++++++++--------------------
 1 file changed, 32 insertions(+), 22 deletions(-)

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index cd4c427..2b20a09 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c

@@ -573,6 +573,36 @@ static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
 	return AE_OK;
 }
 
+static
+int acpi_dev_get_resources_method(struct acpi_device *adev,

Do not break lines like this, please.

It should be

static int acpi_dev_get...

Also I would call it differently, maybe simply __acpi_dev_get_resources()?

quoted

+				  struct list_head *list,
+				  int (*preproc)(struct acpi_resource *, void *),
+				  void *preproc_data, char *method)

const char *method ?

drivers/acpi/resource.c: In function '__acpi_dev_get_resources':
drivers/acpi/resource.c:587:37: warning: passing argument 2 of
'acpi_has_method' discards 'const' qualifier from pointer target type
[-Wdiscarded-qualifiers]
  if (!acpi_has_method(adev->handle, method))
                                       ^~~~~~
In file included from ./include/linux/acpi.h:44:0,
                 from drivers/acpi/resource.c:21:
		 ./include/acpi/acpi_bus.h:55:6: note: expected 'char *'
		 but argument is of type 'const char *'
		  bool acpi_has_method(acpi_handle handle, char *name);

Same problem with acpi_walk_resources().

So either I fiddle (eg cast the const away) with the method string 
in __acpi_dev_get_resources() or I can add an int/bool to detect
which method to use ( _CRS or _DMA) instead of passing a const char *.

Thanks,
Lorenzo