linux-kernel - Re: [PATCH 01/18] ide: add ->read_sff_dma

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Date:	Sun, 07 Sep 2008 22:15:10 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/18] ide: add ->read_sff_dma_status method

Hello.

Bartlomiej Zolnierkiewicz wrote:

>>> static void ide_tf_load(ide_drive_t *drive, ide_task_t *task)
>>> {
>>> 	ide_hwif_t *hwif = drive->hwif;
>>>@@ -323,6 +331,8 @@ static void ata_output_data(ide_drive_t 
>>> 
>>> void default_hwif_transport(ide_hwif_t *hwif)
>>> {
>>>+	hwif->read_sff_dma_status = ide_read_sff_dma_status;
>>>+
>>> 	hwif->tf_load	  = ide_tf_load;
>>> 	hwif->tf_read	  = ide_tf_read;
>>
>>    I also didn't understand the motivation behind putting this method 
>>together with the transport operations... IMO, DMA programming interface 
>>hardly has anything to do with transporting the data over IDE bus.

> The motivation was that hwif->dma_ops is not available yet when
> ->read_sff_dma_status is used in ide_pci_check_simplex().

> However I agree that it should somehow find its way into ->dma_ops
> (as usual patches are stongly preffered :).

    Unless I'm missing something changing the place where hwif->dma_ops is 
initialized to sff_dma_ops (along the lines it was changed for hwif->dma_base) 
seems pretty trivial, so I wonder why you didn't do it in the same patch...
    Hm, I guess I'm seeing a real issue with this patch...

> Thanks,
> Bart

MBR, Sergei
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