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From: Tejun Heo <htejun@gmail.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: jeff@garzik.org, linux-ide@vger.kernel.org, liml@rtr.ca,
	albertl@mail.com, jens.axboe@oracle.com,
	Albert Lee <albertcc@tw.ibm.com>
Subject: Re: [PATCH 06/14] libata: improve ATAPI draining
Date: Fri, 30 Nov 2007 01:09:27 +0900	[thread overview]
Message-ID: <474EE437.4040103@gmail.com> (raw)
In-Reply-To: <20071129155956.4004ca89@the-village.bc.nu>

Alan Cox wrote:
>> * Limit the amount of draining to ATAPI_MAX_DRAIN (16k currently).
> 
> Why 16 not 64K ?
> 
> Please add a comment to note that the drivers assume
> - drain is only ever done on a stuck PIO xfer

No.  ATAPI draining is to accommodate buggy software and hardware and
it's for all misc ATAPI commands whether PIO or DMA.

> - drain occurs before any controller error/reset handling is done

This is part of normal command processing, not really related to EH.

Thanks.

-- 
tejun

  reply	other threads:[~2007-11-29 16:09 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-11-29 14:33 [PATCHSET] libata: improve ATAPI data transfer handling, take #2 Tejun Heo
2007-11-29 14:33 ` [PATCH 01/14] libata: update atapi_eh_request_sense() such that lbam/lbah contains buffer size Tejun Heo
2007-11-29 15:51   ` Alan Cox
2007-12-04 19:27   ` Jeff Garzik
2007-12-05  0:47     ` Tejun Heo
2007-11-29 14:33 ` [PATCH 02/14] cdrom: add more GPCMD_* constants Tejun Heo
2007-11-29 14:33 ` [PATCH 03/14] libata: rename ATA_PROT_ATAPI_* to ATAPI_PROT_* Tejun Heo
2007-11-29 15:52   ` Alan Cox
2007-11-29 14:33 ` [PATCH 04/14] libata: add ATAPI_* cmd types and implement atapi_cmd_type() Tejun Heo
2007-11-29 14:33 ` [PATCH 05/14] libata: make ->data_xfer return the number of consumed bytes Tejun Heo
2007-11-29 15:55   ` Alan Cox
2007-11-29 16:06     ` Tejun Heo
2007-11-29 17:42       ` Alan Cox
2007-11-29 18:00         ` Tejun Heo
2007-11-29 18:24           ` Alan Cox
2007-11-29 18:57             ` Mark Lord
2007-11-29 19:37               ` Jeff Garzik
2007-11-29 19:36             ` Jeff Garzik
2007-11-29 21:22               ` Alan Cox
2007-12-04 19:30   ` Jeff Garzik
2007-12-05  0:49     ` Tejun Heo
2007-12-05  1:05       ` Jeff Garzik
2007-11-29 14:33 ` [PATCH 06/14] libata: improve ATAPI draining Tejun Heo
2007-11-29 15:59   ` Alan Cox
2007-11-29 16:09     ` Tejun Heo [this message]
2007-11-29 16:42     ` Tejun Heo
2007-11-29 17:40       ` Alan Cox
2007-11-29 18:11         ` Tejun Heo
2007-11-29 18:19           ` Alan Cox
2007-12-04 10:06   ` Albert Lee
2007-12-05  1:00     ` Tejun Heo
2007-11-29 14:33 ` [PATCH 07/14] libata: make atapi_request_sense() use sg Tejun Heo
2007-11-29 14:33 ` [PATCH 08/14] libata: kill non-sg DMA interface Tejun Heo
2007-11-29 16:00   ` Alan Cox
2007-12-04 19:31   ` Jeff Garzik
2007-12-05  1:02     ` Tejun Heo
2007-11-29 14:33 ` [PATCH 09/14] libata: change ATA_QCFLAG_DMAMAP semantics Tejun Heo
2007-11-29 14:33 ` [PATCH 10/14] libata: convert to chained sg Tejun Heo
2007-11-29 14:33 ` [PATCH 11/14] libata: add qc->dma_nbytes Tejun Heo
2007-11-29 16:02   ` Alan Cox
2007-12-04 19:33   ` Jeff Garzik
2007-12-05  1:02     ` Tejun Heo
2007-11-29 14:33 ` [PATCH 12/14] libata: implement ATAPI drain buffer Tejun Heo
2007-11-29 14:33 ` [PATCH 13/14] libata: implement ATAPI per-command-type DMA horkages Tejun Heo
2007-11-29 16:04   ` Alan Cox
2007-11-29 16:10     ` Tejun Heo
2007-11-29 14:33 ` [PATCH 14/14] libata: use PIO for misc ATAPI commands Tejun Heo
2007-11-29 16:05   ` Alan Cox
2007-11-29 16:14     ` Tejun Heo
2007-11-29 16:16       ` Tejun Heo
2007-11-29 18:55         ` Mark Lord
2007-11-29 22:52           ` Tejun Heo
2007-11-30  1:03             ` Mark Lord
2007-11-30  1:34               ` Tejun Heo
2007-11-30  4:19                 ` Mark Lord
2007-11-30 13:40                 ` Alan Cox
2007-11-30 13:59                   ` Tejun Heo
2007-11-30 14:12                     ` Jeff Garzik
2007-11-30 15:36                     ` Alan Cox
2007-11-30 13:09             ` Alan Cox
2007-11-29 17:38       ` Alan Cox
2007-12-04 19:34   ` Jeff Garzik
2007-12-05  1:14     ` Tejun Heo
2007-12-05 12:47       ` Alan Cox
2007-12-05 13:03         ` Tejun Heo
2007-12-05 14:01           ` Alan Cox
2007-12-05 14:22             ` Tejun Heo
2007-12-05 14:46               ` Alan Cox
2007-12-05 15:13                 ` Tejun Heo
2007-12-05 18:52                   ` Jeff Garzik
2007-12-06 11:03                 ` Petr Vandrovec
2007-12-06 11:10                   ` Tejun Heo

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