Re: [PATCH] IDE TCQ #4

[Martin Dalecki <dalecki@evision-ventures.com>]

Jens Axboe wrote:
> On Tue, Apr 16 2002, Martin Dalecki wrote:
> 
>>Jens Axboe wrote:
>>
>>
>>
>>>yes this looks like a silly problem. the fix should be to have
>>>ata_ar_get() set ATA_AR_RETURN in ar_flags:
>>>
>>>       if (!list_empty(&drive->free_req)) {
>>>               ar = list_ata_entry(drive->free_req.next);
>>>               list_del(&ar->ar_queue);
>>>               ata_ar_init(drive, ar);
>>>               ar->ar_flags |= ATA_AR_RETURN;
>>>       }
>>>
>>>and then only have ata_ar_put() readd it to the list when it is set:
>>>
>>>static inline void ata_ar_put(ide_drive_t *drive, struct ata_request
>>>*ar)
>>>{
>>>       if (ar->ar_flags & ATA_AR_RETURN)
>>>               list_add(&ar->ar_queue, &drive->free_req);
>>>	...
>>>
>>>Then you can also remove the ata_ar_put() conditional in
>>>ide_end_drive_cmd(), just call ata_ar_put() unconditionally.
>>
>>Well something similar is already in IDE 37... I have just
>>invented a flag ATA_AR_STATIC which get's set in ide_raw_taskfile
>>ata_ar_put ich then checking for if (!(ar->ar_flags & ATA_AR_STATIC))...
>>
>>It has the desired effect in practice.
> 
> 
> sure, just used ATA_AR_RETURN since it was there already. I'm not
> particularly fond of that name though, and ATA_AR_STATIC isn't too good
> either imo. how about ATA_AR_POOL? with the same semantics as
> ATA_AR_RETURN, ie return to pool if flag is set.

ATA_AR_POOL sounds good. It indicates where it's comming from and
where it is going to remain. BTW.> Have you noticed the tactile steps
forward I did in conversion of ide-cd.c to the new command submission in IDE 37?
Any suggestions? It isn't really that abvious how to get finally rid
of struct packt_command... but I think that I'm not far away now.
The only thing that has to be done is to move the sense data and failed
command used in ide-cd away from the packet command structure.
I will not pass it as pointer around but just copy it directly to struct
ata_devices driver_data field... I think.