Re: [PATCH 2/8] staging: vchiq_core: Properly log dev_err()

[Umang Jain <umang.jain@ideasonboard.com>]

Hi Stefan

On 11/10/24 4:15 pm, Stefan Wahren wrote:
> Hi Umang,
>
> [add Raspberry Pi guys to the loop]
>
> Am 11.10.24 um 09:22 schrieb Umang Jain:
>> Properly log a dev_err() message when the msgid is not of
>> VCHIQ_MSG_PADDING type. Drop 'oldmsgid' scoped variable and improve
>> on the error string as well.
>>
>> Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
>> ---
>>   .../vc04_services/interface/vchiq_arm/vchiq_core.c    | 11 ++++-------
>>   1 file changed, 4 insertions(+), 7 deletions(-)
>>
>> diff --git 
>> a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c 
>> b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
>> index e9b60dd8d419..1dca676186b6 100644
>> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
>> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
>> @@ -1188,13 +1188,10 @@ queue_message_sync(struct vchiq_state *state, 
>> struct vchiq_service *service,
>>       header = (struct vchiq_header *)SLOT_DATA_FROM_INDEX(state,
>>           local->slot_sync);
>>
>> -    {
>> -        int oldmsgid = header->msgid;
>> -
>> -        if (oldmsgid != VCHIQ_MSGID_PADDING)
>> -            dev_err(state->dev, "core: %d: qms - msgid %x, not 
>> PADDING\n",
>> -                state->id, oldmsgid);
>> -    }
>> +    if (header->msgid != VCHIQ_MSGID_PADDING)
>> +        dev_err(state->dev,
>> +            "core: %d: qms - msgid %x, is not a PADDING message\n",
>> +            state->id, header->msgid);
> I'm fine with this change, but the behavior looks strange to me.
>
> Either this is a real error, I would expect the function would return
> with something like EINVAL here or this should be a warning?
>
> Sorry, no idea what's correct here.

indeed, I'll check the code path and see how it is used.

However, I will propose the change (if any) on top of this series/patch. 
Since it would be functional change ... so need to document it 
appropriately.

>
> Best regards
>>
>>       dev_dbg(state->dev, "sync: %d: qms %s@%pK,%x (%d->%d)\n",
>>           state->id, msg_type_str(VCHIQ_MSG_TYPE(msgid)), header, size,
>