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From: Jeff Garzik <jgarzik@pobox.com>
To: SCSI Mailing List <linux-scsi@vger.kernel.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Subject: SCSI synchronization and error handling
Date: Wed, 30 Jun 2004 15:43:21 -0400	[thread overview]
Message-ID: <40E317D9.80904@pobox.com> (raw)


I'm doing some more work on my scsi LLD, libata, and have a few 
questions for the experts in the crowd.

In ATA, some commands need to be sent when no other commands are queued 
to hardware.  Let's say I have a command stream that looks like

	queued write
	queued read
	queued read
	queued write
	non-queued SMART command
	queued write
	queued write

What's the best way to ensure that the SMART command is only executed 
after preceding, queued commands are completed?  My guess is to return 
MLQUEUE_BUSY if (a) ->queuecommand is passed a non-queued command AND 
(b) there are commands queued to hardware already.




             reply	other threads:[~2004-06-30 19:43 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-06-30 19:43 Jeff Garzik [this message]
2004-07-01  0:49 ` SCSI synchronization and error handling James Bottomley

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