Re: [rfc][patch] ide: fix unneeded LBA48 taskfile registers access

[Tejun Heo <htejun@gmail.com>]

  Hello, Bartlomiej.  Happy new lunar year.

Bartlomiej Zolnierkiewicz wrote:
> 
> I would prefer to not teach do_rw_taskfile() about ->tf_{in,out}_flags
> (and convert all users to use helpers) - it is much simpler this way,
> 
> ->flags field in ide_task_t is needed anyway (32-bit I/O flag).
> 

  New lunar year day is one of the biggest holidays here, so I haven't 
got time to work for a few days.  As it's over now, I began to work on 
ide drivers again.  I applied your task->flags patch and am moving my 
patches over it.

  One problem is that, with ATA_TFLAG_LBA48, whether to use HOB 
registers or not cannot be determined separately for writing and 
reading.  So, when initializing flush tasks, if WIN_FLUSH_CACHE_EXT is 
used, we need to turn on ATA_TFLAG_LBA48 to read error location 
properly, and we end up unnecessarily writing HOB registers.

  I think we can...

  1. Just leave it as it is.  It's not that big a deal.
  2. Use another flag(s) to control LBA48 reading/writing separately.
  3. do my proposal. :-)

  I'm currently sticking to #1.  Please let me know what you think.

  Thanks.

-- 
tejun