On Thu, Feb 1, 2018 at 9:20 PM, Andy Shevchenko
<andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:
> Instead of playing tricks with last invalid entry,
> return simple -ENODATA error code casted to pointer.
>
> It would be good for future in case caller passes NULL pointer for
> ID table. Moreover, caller can check the code to be sure what happened
> inside callee.
>
> Fixes: 2b9c698efa58 ("ACPI / scan: Take the PRP0001 position in the list of IDs into account")
> Cc: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
> Cc: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> Cc: Vinod Koul <vinod.koul@xxxxxxxxx>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> ---
> v2: new patch
> drivers/acpi/bus.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index f87ed3be779a..a87a97bf75f8 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -762,7 +762,7 @@ static const struct acpi_device_id *__acpi_match_device(
> */
> if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
> && acpi_of_match_device(device, of_ids))
> - return id;
> + return ERR_PTR(-ENODATA);
So why is returning id from here a problem?
> }
> return NULL;
> }
> --
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