linux-kernel - Re: [PATCH] acpi: resource: Use AE_ABORT_METHOD to terminate acpi_dev_get

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Message-ID: <884a73ea-0bc3-6598-b440-3d7c6a8561b6@gmail.com>
Date:   Sat, 5 Dec 2020 16:59:14 +0000
From:   Dan Scally <djrscally@...il.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        lenb@...nel.org, mika.westerberg@...ux.intel.com
Subject: Re: [PATCH] acpi: resource: Use AE_ABORT_METHOD to terminate
 acpi_dev_get_resources()

On 05/12/2020 15:21, Rafael J. Wysocki wrote:
> On Friday, December 4, 2020 1:27:40 AM CET Daniel Scally wrote:
>> Switching this function to AE_CTRL_TERMINATE broke the documented
>> behaviour of acpi_dev_get_resources() - AE_CTRL_TERMINATE does not, in
>> fact, terminate the resource walk because acpi_walk_resource_buffer()
>> ignores it (specifically converting it to AE_OK), referring to that
>> value as "an OK termination by the user function". This means that
>> acpi_dev_get_resources() does not abort processing when the preproc
>> function returns a negative value.
>>
>> Revert to AE_ABORT_METHOD
>>
>> Fixes: 8a66790b7850 ("ACPI / resources: Use AE_CTRL_TERMINATE to terminate resources walks")
>> Signed-off-by: Daniel Scally <djrscally@...il.com>
> This is simply a revert of the above commit, so it would be better to present
> it as a revert explicitly.

Ah, of course. I'll resend as that, sorry for the noise

>
>> ---
>>  drivers/acpi/resource.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
>> index ad04824ca3ba..f2f5f1dc7c61 100644
>> --- a/drivers/acpi/resource.c
>> +++ b/drivers/acpi/resource.c
>> @@ -541,7 +541,7 @@ static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
>>  		ret = c->preproc(ares, c->preproc_data);
>>  		if (ret < 0) {
>>  			c->error = ret;
>> -			return AE_CTRL_TERMINATE;
>> +			return AE_ABORT_METHOD;
>>  		} else if (ret > 0) {
>>  			return AE_OK;
>>  		}
>>
>
>
>