linux-kernel - Re: [PATCH] libata: 'done' related SCSI cleanups

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Date:	Thu, 18 Nov 2010 10:27:20 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Jeff Garzik <jeff@...zik.org>
CC:	linux-ide@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	linux-scsi@...r.kernel.org
Subject: Re: [PATCH] libata: 'done' related SCSI cleanups

Hello, Jeff.

On 11/18/2010 05:04 AM, Jeff Garzik wrote:
> 
> Checked this into #upstream...
> 
> We cannot easily remove 'scsidone' pointer from struct ata_queued_cmd,
> because of the following code in __ata_eh_qc_complete():
> 
> 	static void ata_eh_scsidone(struct scsi_cmnd *scmd)
> 	{
> 	        /* nada */
> 	}
> 
> 	...
> 
> 	spin_lock_irqsave(ap->lock, flags);
>         qc->scsidone = ata_eh_scsidone;
> 	__ata_qc_complete(qc);
> 	spin_unlock_irqrestore(ap->lock, flags);
> 
> 	scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
> 
> I guess we're avoiding scsi_eh_done() here, Tejun?

No, we're avoiding the usual scsi_done() as after EH they're done by
scsi_eh_flush_done_q().  We can factor out ata_scsi_qc_complete() and
atapi_qc_complete() and create EH variants which don't call ->scsidone
but I'm not sure that would worth the hassle.

Thank you.

-- 
tejun
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